In order to reveal the destructive mechanism of loess landslide induced by stagnant water on the combined surface, and to clarify the influence of the main control factors, this paper takes a typical loess landslide in northern Shaanxi as the research object, analyzes the structure of the rock and soil body, and the excavation and filling construction through the geohazard survey, and analyzes the process of traction sliding caused by the stagnant water on the combined surface at the different stages of the project by combining with the calculation of the stability of the slope body. Further the article analyses the process of traction sliding caused by water on the combined area due to construction by means of a discrete element model, and delves into the mechanism of strength reduction of saturated loess. The results show that: 1) the combined surface stagnant water type loess landslide has the characteristics of sudden sliding and rapid evolution, which is highly hazardous and difficult to prevent and control; 2) the slope destabilization is controlled by the engineering geological conditions, and the slope excavation changes the original mechanical equilibrium conditions of the slope, which provides the dynamic conditions for the traction sliding of the slope; 3) the change of the hydrogeological environment results in the obstruction of the natural drainage channel, which leads to the formation of continuous sliding surface due to stagnant water on the combined surface, and the formation of a continuous sliding surface due to stagnant water on the combined surface. Surface stagnant water to form a continuous slippery surface, inducing the overall destabilization of the slope damage; 4) loess strength index with the increase of saturation and the exponential function form of reduction, and when the saturation degree reaches more than 80%, the strength index of the soil body to reach the basic stability. The article expanding the ideas of landslide control and analysis, and the research results will provide a theoretical basis for the design of junction landslide management in the loess areas of northern Shaanxi.

黄土暗穴常常影响油田站场的选址或对站场建构筑物安全构成威胁.为探究不同因素对黄土洞穴地基稳定性的影响,将洞穴概化为理想椭球状,利用ABAQUS程序建立油田站场典型建构筑物基础下伏黄土洞穴三维模型进行了大量的数值模拟分析.结果表明:当洞穴埋深越小、尺寸越大、与基础距离越近、高跨比越小,洞穴地基的稳定性越低,地基承载力越小,基础沉降越大;下伏洞穴地基极限承载力、洞穴安全埋深以及洞穴与基础的安全距离可通过基础沉降和地基土塑性区分布来确定.

黄土边坡的失稳问题是岩土工程中迫切需要解决的工程难题之一.首先,选取陕北黄土边坡为研究对象,开展4种雨强条件下的野外人工模拟降雨试验,通过测试边坡两侧开挖隔离槽并埋设隔离布从而改进测试边坡两侧的边界条件,实测不同雨强条件下边坡浸水深度以及土体含水率变化;然后分析不同雨强条件下降雨入渗过程和边坡应力变化特征,并比较不同雨强条件下入渗规律之间的差异.试验结果表明,不同雨强条件下的黄土边坡入渗深度均呈现坡脚最深、坡顶次之、坡中最浅的规律,入渗速率则是坡顶最快,其次是坡脚,最后是坡中;且随着深度的增加,雨水入渗能力逐渐减弱.随着雨强的增大,同一埋深处测点的体积含水率及土压力变化幅值变大,且含水率及土压力突变时间相应缩短,边坡的冲刷效果愈加明显.最后基于Geo-studio软件进行渗流分析,验证了现场试验结果的正确性,明晰了雨强对黄土边坡降雨入渗的影响.

长庆神木气田采出液中乳化油含量较高,严重影响自然沉降油水分离效果,给采出液处理系统的平稳运行带来较大困难.天然气气质组分及采气过程中添加的泡排剂、压裂液等物质均对乳化油的形成有一定影响,经对水质化验、沉降试验及室内乳化试验、生产运行等的综合性分析表明:神木气田采出液高含乳化油的两个主要原因是天然气中C3以上含量较高及采气过程中投加的泡排剂,且投加的泡排剂对后续的破乳效果有较大影响.

计算机信息技术的发展使数字化技术在岩土工程勘察中的应用成为可能, 该项技术在一定程度上弥补了传统勘察技术的不足, 提高了岩土工程勘察的水平, 为工程施工设计提供了更加可靠的参考资料. 鉴于当前岩土工程勘察的发展趋势, 本文将对数字化技术及其应用情况进行深入探讨, 以期不断提高我国岩土工程的勘察水平.

When a mine is abandoned,dewatering stops.The inflow from water floods roadways,mining crack fracture system,and then overflows the aquifer where the water had been drained when coal was mining.Thus the groundwater rebound was in abandoned mines.Quantitative analysis and study on flow characteristics during water flooding are important for forecast and prevention of secondary disasters caused by water rebound process.Numerical model for multimedia of groundwater rebound in abandoned mines was established,and relationship between recharge,water tables of abandoned mines and the resource aquifer was derived and their expression of function was also put forward.Based on the function the FEFLOW module had been developed for calculating the real-time recharge to mines.Finally the groundwater rebound process was simulated in a abandoned mine which was a horizontal seam mining,and the flow features and water table value of different media were obtained.

将数理统计中的Fisher判别分析法应用于边坡稳定性评价中,结合前人研究经验,选用影响边坡稳定的6个主要地质参数边坡重度、内聚力、摩擦角、边坡角、边坡高度和孔隙水压力比作为判别变量,以前人研究中已有明确结论的边坡工程相关数据资料作为训练样本,建立相应的评价边坡稳定性的线性Fisher判别函数。使用SPSS软件进行Fisher线性判别函数的建立与分析。并且采用回判估计方法对判别结果进行验证,误判率为零。用建立的判别模型对5个待评价边坡进行判别分析,结果与实际情况符合良好。说明Fisher线性判别法是一种有效地评价边坡稳定性的手段,在边坡工程中具有较好的应用前景。

Pipeline Investigation Division of Mathematical Statistics is a comprehensive reflection of the surface vegetation,which provides detailed concrete material for design and construction of pipelines,such as engineering geology,topography,lithological characteristics,the adverse geology a series of important parameters and so on.In the preparation of workout the report,due to the huge amount of data pipelines,surface vegetation zoning district,engineering geology work in mathematical statistics are occupied a large workload.However,according to the present situation,it is generally still manual calculator using the traditional computing,which is cumbersome and time-consuming,error rate is also high.In this paper,according to the status quo,for the pipeline by means of statistical approaches to analyze the corresponding research and development platform based on the measurement and characteristics of the professional statistical software,which is improving the efficiency mathematical statistics and reducing the workload and error probability,having achieved good results.