Sufficient light and high UV intensity pose significant challenges to the long-term performance of polymeric geonet materials for slope-protection structures. This study investigates strength degradation under the effect of UV radiation; five different types of geonets were selected, which can be categorized as polyamide (PA), polypropylene (PP), and polyethylene (PE) materials. A comprehensive experimental investigation was performed, including tension strength, peer strength, artificially accelerated aging, and SEM tests, to further establish a service life prediction method used for slope-protection design. The results showed that the tension strength, percentage of breaking elongation, and peer strength all depict a descending trend with aging-elapsed time, especially in the early 600 h. The decreasing tendency of these mechanical properties’ magnitude differed in the diversity of direction and material type. Significant changes have been generated on the geonet surface after aging; materials with smooth surfaces exhibit a strong ability against strength degradation. Fitting results affirmed the predictive technique as a useful engineering tool for tension strength assessments, offering guidelines for using and designing of geonets for slope-protection structures.

为探究采用不同结构毛细阻滞覆盖层处治的膨胀土边坡的防渗能力,基于非饱和渗流理论并运用Geo Studio有限元软件,开展持续大雨作用下"细-粗"型(I型)、"细-导排层-粗"型(Ⅱ型)、"细-粗-细"型(Ⅲ型)和"细-粗-细-粗"型(Ⅳ型)这4种毛细阻滞覆盖层(厚度均为5 m)处治膨胀土边坡的渗流及稳定性数值分析,研究不同降雨历时下各覆盖层内部体积含水率的分布特性、膨胀土边坡的体积含水率变化规律及其对边坡安全系数的影响.研究结果表明:在持续大雨作用下,不同结构覆盖层均能在一定程度上减少降雨渗入边坡内部膨胀土;雨水入渗突破不同结构覆盖层所需的时间不同,覆盖层按防渗性能由强至弱顺序排列依次为Ⅱ型、Ⅳ型、I型和Ⅲ型;未经处治边坡的安全系数急剧降低,易发生破坏;4种覆盖层处治边坡的安全系数均在降雨前期稍降低;在长期降雨条件下,I型和Ⅲ型覆盖层处治边坡的安全系数降幅大,而Ⅱ型和Ⅳ型覆盖层处治边坡的安全系数降幅较小,且各方案处治的边坡稳定性较好.因此,建议在实际工程采用Ⅱ型和Ⅳ型毛细阻滞覆盖层处治膨胀土边坡.

It is very important to clarify the mechanism of soil-water chemical interaction between acid rain and expansive soil for studying the deterioration mechanism of performance of shallow expansive soil and slope stability in acid rain areas. Therefore, the undisturbed expansive soil in the acid rain-affected areas in Baise City, Guangxi Zhuang Autonomous Region is studied. A cyclic water saturated test device is designed to simulate the rainwater infiltration environment with different pH values to carry out soil-water chemical tests. A variety of micro-test techniques are used to explore the evolution law of minerals and chemical components in the expansive soil. The mechanism of soil-water chemical interaction between expansive soil and acid rain is analyzed by using PHREEQC simulation software and soil-water chemical theory. The results show that compared with the static water saturated environment, the dynamic water saturated environment of rainfall infiltration promotes the dissolution and leaching of minerals in the expansive soil, and accelerates the destruction of soil structure. The dissolution and leaching amount of CaO, Fe2O3, K2O in the expansive soil under acid rain infiltration is significantly greater than that of SiO2, Al2O3. The lower the pH value of rainwater, the more the cements such as calcite and free oxides leached between the sheet microstructures of the expansive soil, and the ion-exchange will be enhanced. The interaction between acid rain and minerals in soil is intensified, and part of illite is converted into montmorillonite clay minerals, resulting in the decrease of illite content, the increase of montmorillonite content, the enhancement of soil hydrophilicity and the increase of structural instability, which is not conducive to the stability of expansive soil slopes.

Slope rock mass containing locked segments is susceptible to freeze–thaw (F-T) weathering. It can result in slope instability and serious geological hazards. This paper conducts mechanical analysis and F-T tests to investigate the failure mechanism of the rock slope with locked segment subjected to F-T cycles. Using theoretical analysis, the cusp catastrophe prediction model for the failure of locked slope in cold regions is established, and the catastrophe eigenvalues are derived. The results show that the stability of the locked slope is related to the stiffness ratio considering the F-T treatment. As the F-T cycles increase, the damage variable increases in the form of a power function. In addition, a threshold of the number of F-T cycles exists for the degradation of locked slope caused by F-T weathering. By substituting the damage variables of the F-T cycles obtained from the experiment into the developed cusp catastrophe model, it can be deduced that the locked slope with 45° creep-slipping segment is the most sensitive to the effects of F-T degradation, and the most prone to landslides. Finally, the frost resistance is the strongest for the locked slope with 15° creep-slipping segment.

为探究装配式基层沥青路面接缝应力在路表温度变化时的情况,应用Abaqus软件建立路面结构的三维有限元模型,使用稳态热分析获得路表温度变化对接缝应力的影响,同时通过顺序热力耦合方法实现温度与荷载的耦合,分析接缝的力学响应.结果表明:温度场是非线性的传热过程;降温比升温对基层接缝应力的影响更大;接缝温度应力随面层厚度的增大而减小,受基层尺寸影响小;温度对接缝应力的影响远大于车辆轴载;超载重载对道路结构有严重危害.

The freeze-thaw cycles have an important effect on the mechanical properties and damage characteristics of flawed rock mass in cold regions. This work carried out freeze-thaw tests and uniaxial compression tests to experimentally investigate the degradation mechanism and evolution characteristics of pre-flawed granites subjected to freeze-thaw cycles and compression load. The failure mode of rocks containing macroscopic and mesoscopic flaws was analyzed by numerical simulation. The damage model of flawed rocks under coupling action of freeze-thaw cycles and loading was established. Results show that the failure mode of granites is dominated by the pre-flaws, and the freeze-thaw cycles will only affect the failure degree of granites. The mesoscopic damage caused by freeze-thaw cycles gradually accumulates, resulting in the initial mesoscopic damage in flawed rocks. In particular, the damage caused by the early period of the freeze-thaw cycles (i.e., 30 times) increases most. The total damage of the rock sample with 15° flaw angle is the smallest subjected to coupling action of freeze-thaw cycles and compression load, and the total damage of samples with 45° flaw angle is the largest. The tendency in strength degradation for flawed rocks subjected to F-T cycles calculated by the proposed model can be verified by experimental results, which proves the applicability of the model.

针对沙特吉赞新建的围海造陆货物堆场的地基处理,基于珊瑚礁砂的疏浚工程特性,开展了用两种振冲挤密法加固该处不良级配疏松礁砂地基的有效性及确定其相应工艺参数的现场试验.先完成选定小区试验,后由SPT检验其效果,再分析确定最优振冲工艺并指导了大面积工程施工.通过比对场区地基加固前、后的CPT检测结果,用Iwasaki液化指数法对振后地基做进一步液化判断,同时采用极限法(基于CPT)和施莫法(基于SPT)对加固地基进行了沉降分析并对比两种计算结果,验证本试验研究所确定的加填料振冲方案与施工工艺合理性,加固后地基的承载及抗液化能力得到有效提高且完全能满足工后沉降控制要求.研究成果可供珊瑚礁海域的类似工程参考或借鉴.

To obtain the action force between the reinforcing material and filler in reinforced soil, many scholars at home and abroad have conducted pullout tests, which are limited by the testing apparatus. Most of them have studied the pullout force between a biaxial geogrid and sand. The pullout force formula is generally believed to be composed of the surface friction and lateral resistance of transverse ribs, and uniaxial geogrids have rarely been researched experimentally on the basis of the pullout force between them and the expansive soil filler due to the large distance among transverse ribs. This study draws on existing methods to determine the pullout force, conducts a preliminary analysis, proposes a formula for calculating the maximum pullout force, uses a self-developed large-scale CNC pullout test system, and utilizes its large size, bidirectional airbag loading, and ability to eliminate side wall friction. The design of the test scheme is optimized to obtain two important calculation parameters in the formula: one is to cut grids of different lengths to provide lateral resistance and then implement them to obtain the coefficient of sliding friction between grid and fill; the other is to develop different numbers of horizontal ribs in the pullout test of a grille, and the lateral resistance of the end bearing of a single transverse rib is measured. The results of the lateral resistance of the end bearing based on the analysis of the three mechanisms of shear, punching, and Prandtl failures are compared. The lateral resistance of the lateral rib end bearing measured from the test is proven reasonable. Two types of expansive soils reinforced by different types and sizes of grids are analyzed with the calculation formula of the maximum pullout force, and the coefficient of pullout friction is determined to be rational. The research results can be used to guide the design and construction of uniaxial geogrid-reinforced expansive soil and the modification and upgrading of products by grid manufacturers.

In this study, to reveal the swelling and cracking characteristics of expansive soil subjected to cyclic drying-wetting of acid rain, the effects of acid rain and cyclic drying-wetting on the swelling deformation of expansive soil were studied by using the load-free swelling rate test. Afterward, a high-definition digital camera was used to capture the crack development images of the sample during the dehumidification process under cyclic drying-wetting of acid rain. Furthermore, the changes of the microstructure and mineral composition of the expansive soil after cyclic drying-wetting of acid rain were analyzed by using the scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests. Finally, the effect mechanisms of acid rain and cyclic drying-wetting on the swelling deformation and crack development of the expansive soil were discussed. The results indicate that acid rain has a positive effect on the swelling deformation and crack development of the expansive soil. The effect is greater with a stronger acidity of rainfall. Moreover, the combined action of acid rain and cyclic drying-wetting can promote the swelling deformation and crack development of the sample more notably. The swelling rate of the sample increased most significantly during the first two-time cyclic drying-wetting. The measured swelling rates at pH = 3 and 5 are 23.7% and 20.6%, respectively, which are higher than the swelling rates of 19.0% at pH = 7. The humidity of samples is 17–18% after the first-time drying-wetting cycle. The crack area ratios ( M f ) of the samples with pH values of 5 and 3 are, respectively, increased by 11.0% and 69.1%; the average crack width of the sample increases by 32.3% and 93.3%, respectively, compared with pH values of 7. After the fourth-time drying-wetting cycle, M f and the average crack width of the samples under the rainwater environment of three pH values increase greatly, but the difference of M f among them became unapparent. In addition, the microscopic test results show that acid rain can corrode the binding materials (e.g., SiO 2 , Al 2 O 3 , K 2 O, MgO, and CaO) in the expansive soil. The erosion of the binding minerals weakens the structural connection strength, resulting in continuous increases in both size and number of microvoids. Under the superimposed influence of cyclic drying-wetting, the above changes are even more dramatic. Macroscopically, the swelling deformation of expansive soil increases and the cracks develop rapidly.

为弄清酸雨与湿干循环共同作用对膨胀土裂隙发育的影响,以广西酸雨重灾区的百色原状膨胀土为对象,室内设置高清照相机观测记录经不同酸雨与湿干循环作用后试验土样的裂隙发展,用Image-Pro Plus(IPP)图像处理软件获取土体裂隙特征参数,并采用扫描电镜(SEM)和X射线衍射法研究试验过程中土样的微结构及化学成分演变.据此,从分析膨胀土叠聚体间微结构受力及裂隙发育演化2个方面,探究酸雨与湿干循环作用下土样的裂隙发育规律及其微观机制.结果表明:酸雨将促进试样裂隙发育,酸雨pH值越小,裂隙发展愈明显;相比中性水的湿干循环环境,湿干次数n=1、湿度为17％?18％的试样,在pH值为5和3酸液作用下,实测的裂隙面积率分别增大11.0％和69.1％;当n增至4、湿度为7％?8％时,试样裂隙面积率的增幅分别达17.3％和31.8％,可见酸雨与湿干循环的共同作用对试样裂隙发育的促进作用更加显著.微观对比分析得出,酸雨与湿干循环共同作用使土中胶结物质迅速流失,土粒间化学胶结力Pf、静电引力Pi和土粒自重Pz均减小,土样横截面的平均强度下降,导致叠聚体微结构由于相互引力的减小而逐渐分离,形成新的孔隙,且新孔隙将由表及里不断拓展,进一步引起土样结构中的含水率不均匀分布,并加快其脱湿速率,最终造成土中裂隙发育加剧.

This study probes into the effects of acid rain on the swelling properties and microstructure of natural expansive soil. Acid rain was simulated by diluted sulfuric acid and diluted nitric acid solutions at the pH of 3 and 5. For comparison, distilled water with a pH of 7 was set as the control group. Firstly, load-free swelling rate tests were carried out to study the effects of acid rain on the swelling properties of the natural expansive soil. Secondly, scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), and X-ray diffraction (XRD) tests were performed to analyze the changes in the microstructure and mineral composition of the natural expansive soil after acid rain infiltration. Finally, the affecting mechanisms of acid rain on the swelling properties of natural expansive soil were evaluated. The results showed that the expansive deformation of the soil was greater when the pH of the solutions was lower. The expansion rate of the soil was 24.3% higher in the solution at the pH of 3 than that at the pH of 7. The dissolution or degradation of the cementing substances (e.g., K2O, MgO, and CaO) in the expansive soil weakened the structural connection strength and dispersed the face-to-face stacked structure, resulting in continuously increased size and number of microvoids. Macroscopically, expansive soil under acid rain infiltration exhibited increased expansive deformation.

In order to reveal the evolution characteristics of the frost heaving pressure caused by the water–ice phase transition and volume expansion of the fractured rock mass subjected to the periodic freeze-thaw cycles, and the degradation effect of the freeze-thaw cycle on the mechanical properties of the fractured rocks, the long-term frost heaving pressure monitoring and uniaxial compression test were carried out on saturated fractured granite with different crack size. The results show that the evolution curve of frost heaving pressure can be divided into five stages. With the increase of freeze-thaw cycles, the peak frost heaving pressure decreases exponentially. The peak frost heaving pressure increases linearly with the increase of crack length. The influence of size effect on frost heaving pressure decreases with the increase of freeze-thaw cycles. As the number of freeze-thaw cycles increases, the rate of P-wave velocity decreases gradually. The peak stress loss rate of rock with different crack length increases in the form of power function with the increase of freeze-thaw cycles. The peak strain changes in the form of quadratic polynomial function with the increase of freeze-thaw cycles. The research results can provide reference for theoretical calculation and numerical analysis of frost heaving pressure of fractured rock mass in cold regions.

为获得加筋土中筋材与填料间的作用力,国内外不少学者开展过拉拔试验,受测试仪器所限,多是研究双向土工格栅与砂土间拉拔力,建立拉拔力计算公式时,普遍认为它由表面摩擦力与横肋侧面阻力两者构成,而单向土工格栅因横肋的间距较大,目前对其与膨胀土填料间拉拔力的试验研究还鲜见.借鉴已有确定拉拔力的多种方法,提出最大拉拔力计算公式,采用自行研发的大型数控拉拔试验系统,利用其尺寸大、双向气囊加载、能消除侧壁摩擦等优势,优化试验方案设计以获取公式中两重要计算参数:一是将不同长度格栅剪去提供侧面阻力的横肋后实施拉拔,得格栅与填土间滑动摩擦系数;二是开展不同横肋数格栅的拉拔试验,测得单根横肋的端承侧面阻力.对比基于剪切破坏、冲切破坏及普朗特破坏3种机理分析所得端承侧面阻力结果,验证了试验测得的横肋端承侧面阻力较合理,并通过试验再次验证用最大拉拔力计算式分析不同型号、尺寸格栅加筋两种膨胀土及确定拉拔摩擦系数合理.研究成果可用于指导单向土工格栅加筋膨胀土工程的设计与施工以及格栅厂家对产品的改型升级.

Many scholars have carried out the reinforced pullout test in soil. Limited by the testing instruments,most of them study the influence on the test results by changing the moisture content,thickness( overburden pressure),type( coarse and fine soil),pullout speed and other factors. In addition to the type of reinforcement( geogrid,belt,net or cloth),there is few research on the initial tension state of reinforcement,which is another important factor in reinforced soil. In this paper,the CS-LB01 large scale numerical control pullout test system developed by Changsha University of Science and Technology was used to carry out the expansive soil reinforcement pullout test with the advantages of large size,bidirectional airbag loading,eliminating side wall friction,etc. The effects of geogrid size,initial tension state,air temperature,interface residual strength,pullout method,etc on the measured values were investigated. The results show that the size of the geogrid has a certain effect,especially the width. For Maximum pullout force,the effect of the grid stress release is nearly 8.8%,and the effect of the pullout mode is about 12.1%,and the effect of the temperature is 15.9%,the effect of the residual strength is 23.6%. The research results can be used as reference for engineering design of reinforced expansive soil.

单向土工格栅加筋膨胀土技术在治理膨胀土地区堑坡坍滑方面得到了成功的运用,该技术的关键是筋土间的相互作用力,需通过拉拔试验获得.国内外不少学者尝试用数值模拟来获取土中加筋的拉拔力,而模拟所需参数大多采用经验估算或文献获得.由于一些参数取值与实际不符,导致模拟结果与工程实测值有不小误差.目前通过完成系统试验获得所需参数后再做数值模拟的不多,而先做加筋膨胀土拉拔试验,再对其数值模拟的更鲜见.首先用直剪试验获得了膨胀土的抗剪强度指标,然后用自行研发的大型数控拉拔试验系统完成了单向土工格栅加筋膨胀土拉拔试验,取得了数值模拟所需单位面积刚度系数、筋土界面黏结强度及摩擦角等参数,重新设计并进行了带位移监测且改变施测上覆压力的拉拔试验.运用FLAC3D软件,利用其内置的土工格栅单元对试验测试结果进行了数值模拟.通过对拉拔力、监测位移的模拟结果与试验实测数值间的对比发现:两者误差较小,表明将数值模拟法用于预测加筋膨胀土试验中筋材的拉拔力及位移可行,能方便获取筋土间应力、应变的发生、发展与变化,可减少做拉拔试验的经济和时间成本,为加筋机理研究提供了一种快速便捷的研究方法.

为获得土中加筋固土的工作机理,国内外学者们曾先后研发了多种拉拔试验仪器并展开相关试验研究,取得了不少有价值的成果,各有关部门也制定了行业规范,对仪器开发及试验方法提出了指导意见.近年来,随着工业技术的飞速发展,人们已开始将可控、可视和数字化等新技术用于试验仪器的研发与运用,但目前对拉拔试验仪器仍没有统一的标准.为进一步规范试验仪器的开发和使用,为研究筋土界面特性提供更便捷和高效的工具,对现有拉拔试验仪器进行了归纳总结.基于长沙理工大学自主研发的大型数控拉拔试验系统(CS-LB01),结合十多年用它开展的加筋膨胀土拉拔试验及对土中加筋作用力的深入研究,进一步分析发现试验中箱体尺寸、夹具位置、拉拔方向、位移量程等对测试结果有重要的影响.总结提出:施测过程中拉拔速度与位移、测试时的温度与湿度及填料填筑碾压等相关工作参数应怎样正确设置;必须按照实际工况模拟不利条件和环境下开展试验,确保测试结果符合实际;结合消除箱壁摩擦、合理裁剪筋材、夹具夹紧筋材测点等测试技术上所获得的新认识,为下一步新仪器的开发及试验操作的规范化提供参考.

The Baise expansive soil in heavy acid rain area of Guangxi was selected as the study subject. To explore the effect of acid rain on the swelling-shrinkage properties of Baise expansive soil, the load-free swelling rate test, swelling force test and linear shrinkage rate test were carried out under different acid conditions (pH values are 3, 5 and 7, respectively) . The changes in the microstructure and mineral composition of expansive soil were analyzed through the scanning electron microscopy (SEM) images and X-ray diffraction (XRD) patterns, the microstructures of specimens in SEM images were quantitatively analyzed based on the image processing software Image-Pro Plus (IPP) . Research result shows that with the decrease of initial water content, the effect of acid environment on the expansive deformation of specimen increases. When the initial water content decreases from 17％ to 9％, the differences of load-free swelling rate between the specimens under different acid environments increase. Comparing with the neutral solution, the increasing ranges of specimen load-free swelling rates soaked in acid solutions with pH values of 3 and 5 grow from 20.6％ and 5.6％ to 26.9％ and 7.0％, respectively. With the decrease of solution pH value, the load-free swelling rates, swelling forces and linear shrinkage rates of specimens increase by stages. Comparing with the neutral solution, the measured load-free swelling rate, swelling force and linear shrinkage rate of specimen soaked in a solution with pH value of 3 increase by 24.3％, 37.5％ and 16.9％, respectively. The more acidic the environment, the faster the water evaporation in specimen, and the lower the water content in specimen when it is dehumidified to stable. Both the pore number and size of acid-eroded soil increase with the increase of acidity. The soil porosity increases from 8.7％ to 11.9％ and 19.4％, respectively, when the solution pH value decreases from 7 to 5 and 3, respectively. The rapid increase of porosity mainly focuses on pore diameter ranging from 3-5 μm. The acid environment decreases the degree of mineral crystallization. Among them, the free colloidal minerals, such as SiO2, Al2O3, K2O, MgO and CaO, show different degrees of erosion and leaching. The erosion of colloidal mineral weakens the structural connection strength between the stacking structures, resulting in the evolution of stacking structure from face-to-face to edge-to-edge. The more acidic the environment, the severer the evolutionary trend, which directly leads to an increase of the swelling-shrinkage deformation of expansive soil.

弄清酸雨及干湿循环共同作用下膨胀土的膨胀性能及其微结构与矿物成分的变化,对研究酸雨区膨胀土的基本性质劣化及工程问题意义重大.为此,以广西酸雨重灾区百色原状膨胀土为对象,模拟酸雨(pH=3,5,7)与干湿循环(n=1,2,3,4)两者共同作用的环境,开展了无、有荷膨胀率试验,并采用扫描电镜(SEM)、压汞仪(MIP)和X射线衍射仪(XRD)分析了该环境下试样的微结构及矿物成分的演变规律.研究结果表明:酸性环境使试样的膨胀率增大,溶液的pH值越小,膨胀率越大;随干湿循环作用次数的增加,不同溶液环境下试样的膨胀率均先增大后趋于稳定,且2次作用后的增幅最大;经酸性环境与干湿循环共同作用试样的膨胀率增大更多,溶液pH值为3和5,经2次干湿循环后其膨胀率比pH值为7的分别增长了24.7％和7.9％;上覆压力能明显抑制试样膨胀率的增长,设定测试压力越大,该值下降越显著.酸性环境与干湿循环共同作用下膨胀率增大的机理可通过微观结构分析作出解释:酸性环境作用下膨胀土中游离SiO2,Al2O3,K2O,MgO,CaO等胶结物出现不同程度的溶蚀和淋滤,削弱了叠聚体结构间的联结作用,使面面叠聚结构的排列趋于分散,微孔隙体积及数目不断增大,同时遭受干湿循环作用后,土中微孔隙加速发育,土颗粒与溶液水间化学反应更剧烈,致使其膨胀变形进一步增大.因此,酸雨重灾区的膨胀土工程建设,必须考虑酸性环境与干湿循环共同作用造成的膨胀土基本性质劣化的不利影响.

针对膨胀土边坡坍滑多呈浅层性,取广西百色膨胀土为对象,设计并开展经干湿循环作用含低围压条件的重塑土饱和三轴固结排水试验,着重分析橡皮膜约束对围压的影响并做出校正,对比分析校正前、后的实测抗剪强度参数,探究不同干湿循环次数及试验围压下的强度及应力-应变关系.结果表明:经干湿循环作用,各级围压下试件的应力-应变均呈应变硬化特征;围压越大,初始模量越大,主应力差也越大;干湿循环作用下,橡皮膜约束等效围压σ3e均随试验围压σ3增大而减小;0次干湿循环下,σ3由5 kPa增至200 kPa时,σ3e从9.1 kPa减少至6.7 kPa,σ3e/σ3由181.8％减少至3.4％,橡皮膜约束对低围压的测试结果影响显著,须进行校正;干湿循环由0次增至6次,校正前低、高和全围压段的黏聚力分别衰减34.7％、27.7％和28.3％,校正后衰减达77.1％、31.9％和35.6％,但摩擦角变化小;橡皮膜约束影响后,经6次干湿循环作用,低围压段的黏聚力仅为0.8 kPa,趋于0,摩擦角为18.5°;膨胀土边坡稳定性分析时,宜采用低、高围压两段拟合校正围压应力圆的强度参数,以获得与实际坍滑破坏较吻合的计算结果.

挡土墙承受的主动土压力一直是土力学重要课题,但至今未见填黏土路堤墙曲线破裂面并计及填土开裂的土压力分析法.为此,借鉴已有旋轮线破裂面和直线破裂面计及开裂的两极限平衡层分法开展研究,以弥补这一缺陷.先在滑体土中取一微分薄层,通过单元土体静力平衡分析,导出任意墙背和填土面倾角、填土性质及墙土接触条件下土压力求解公式;然后研究墙顶填土开裂过程及深度算法,采用计算机编程求极值,进而建立曲线破裂面计及填土开裂的路堤墙主动土压力分析方法;分别对比不计填土开裂的旋轮线破裂面法和考虑开裂的改进层分法对各算例土压力分析结果,验证了本研究方法合理且优越;最后通过变填土黏性路堤墙实例分析,进一步验证了本研究方法的唯一合理性及适用范围,并提出目前工程中此类挡墙设计尚存问题及建议.