红岩溪隧道是国内高速公路史上首条富含油气的高瓦斯隧道.为解决隧道开挖过程中含油气瓦斯安全问题,文章对红岩溪隧道掌子面岩石、涌出气体与油溶性物质进行了现场检测和气样的碳同位素实验室测试分析.研究结果表明,该隧道瓦斯成因类型属低熟煤型油气,为非常规类型高瓦斯隧道.通过采取瓦斯防治培训、应急救援演练、安全管理流程规范化、通风系统改造、监测监控系统建立和重大危险源专项治理设计等综合防范措施,保证了该高危险源隧道安全贯通.

In order to study the influences of the ultimate frictional resistance of the backfill on the bearing characteristics of piles, the method for calculating Q-S curve of piles with exponential load transfer equation is obtained by considering the nonlinear change of the ultimate frictional resistance of backfill under low confining pressure. This method is validated by combining the existing research results and engineering practice results, and the influences of parameters of the ultimate frictional resistance on bearing characteristics of piles are discussed. The results show that the side resistance of the rock-socked section first reaches the extreme value. The normal stress σ and the test parameters A and b of the material are very beneficial to improve the side resistance and the ultimate bearing capacity of piles. Especially, the influences of the normal stress σ on the side resistance and the ultimate bearing capacity of piles are obvious.

页岩气赋存地层地质条件复杂,且伴有高浓毒气、高瓦斯等.文章以湖南龙永高速公路红岩溪隧道工程为背景,介绍了该隧道内涌出气体的试验检测结果,并对其成分和来源进行了分析.结果表明,区别于通常的高瓦斯隧道,红岩溪隧道涌出气体存在高浓度的CO毒气和刺鼻的油气.通过气体碳同位素检测、岩样及含油迹灰岩有机地球化学分析和饱和烃色谱色质分析,判识红岩溪隧道地层中见到的天然气及渗漏和溢出的轻质油,其成因类型属低熟煤型油气,主要油气来自附近的煤系地层在低熟热演化阶段所形成.同时,探讨了页岩气地层隧道有害气体产生机理及其地质构造成因,根据区域地质分析,下伏煤系地层是隧道有害气体的来源之一,同时蕴含在下寒武统牛蹄塘组泥页岩中的页岩气,可能部分通过地质运动产生的裂隙涌入隧道.根据上述特点,提出了一些相应的灾害防控措施,包括衬砌加强、超前钻孔勘探、围岩注浆封堵、混合式通风及有害气体负压抽放等,可有效降低页岩气地层隧道施工中有害气体危害.此外,加强页岩气地层隧道弃碴的处理,防止其引发地下水污染、人员中毒或其他次生地质灾害.由于页岩气地层地质条件的复杂性,隧道施工与运营期间有害气体的扩散规律有待进一步的深入研究.

Based on the microscopic rock mechanics and the digital detailed measure of morphology characteristics in the joint surface, the numerical model was built to simulate the direct shear test of the fracture rock surface in the Tongkeng zinc/copper mine. The parameters of joint were back analyzed by the software PFC2D(particle flow code). The mechanical parameters of the rock mass structure were obtained and predicted by back analysis method from the numerical shear test. Numerical simulation results showed: The main failure is the interfacial shear slip under the smooth joint surface; The cohesion of the structure surface is 0.45 MPa, and the internal friction angle is 35.8° in Tongkeng zinc/copper mine; it is consistent between the simulated results and the results of the Gaofeng Mine.

To improve the safety of tunnel blasting construction,study on the influence of blasting on the structural stabihty of tunnel and Karst cave was carried out.Combining with the Karst cave area in Naqiu tunnel,the numerical analysis of the stability of tunnel under blasting dynamic load was carried out with MIDAS.The analytical results show that the stress concentration phenomenon had arisen in the tunnel vault,arch feet and top of Karst cave.At the same time,the maximum vertical displacement of tunnel vault is 7.51 mm,and displacement of the top of karst cave is 2.46 mm.Meanwhile,the peak particle velocity of surrounding rock is 17.45 cm/s which appeared in tunnel vault,the peak particle velocity of Karst cave is 9.81 cm/s and decreased from top to the left.Finally,one the one hand,key support area was proposed according to the results,on the other hand,the safety standard of vibration velocity was put forward by combining the in-situ test data with the dynamics theory of rocks.

In order to study the influence of the backfill characteristics of the large karst area on the load transfer of the pile foundation and to improve the safety and economy, considering the characteristics of the side friction resistance of the pile back and the pile in the large karst area, based on the exponential load transfer function, the method for calculating the load-settlement curves of backfill piles in large karst area is obtained. The method is verified by the existing research results and engineering examples. The results show that the proposed method is in good agreement with the actual project. Based on this method, the influence of parameters on the load- settlement curves of karst piles is analyzed. The results show that the load-settlement curves of pile foundation increase with the axial strain, particle size of gravel and pile parameter ?b, and the ultimate bearing capacity of the piles increases with the increase of the axial strain and pile parameter ?s and decreases with the increase of the particle size of gravel.

The current analysis method of pile foundation under horizontal load are analyzed comprehensively.First,mechanics model of rigid pile in slope considering pile lateral stress is established. Second,according to the principle of limit equilibrium,the bending moment and stress equilibrium equation of rigid pile in slope under lateral load are proposed.Then the pile lateral ultimate bearing capacity and horizontal resistance coefficient along the depth increasing linear are developed using p y curve method. The proposed method is applied in the case study,and the results verified the rationality and feasibility of this method by comparative analysis with the existing finite element calculation methods.Finally,the method is used to perform a series of parametric analyses,such as angle of slope,pile soil contact surface coefficient and horizontal resistance coefficient,and some significant conclusions are drawn.The slope Angle,contact surface coefficient of pile and soil has significant impact on the load displacement curve of rigid pile,and the resistance coefficient of pile side soil impact load displacement curve of is not obvious under the action of the lateral load.

Super-large water incidents during the Hanlinjie tunnel construction,emergency treat-ment are introduced in detail in this paper,on the basis of the advanced prediction analysis the reason of the water,puts forward the water curtain grouting resistance,pipe roof with a small catheter through the waterlogging area several engineering measures such as governance plan,for reference.

This paper briefly introduces the big collapsed of Hanlinjie tunnel construction,analy-zes the causes of and research the landslide treatment scheme,targeted to develop the construction proce-dures,better to complete the landslide treatment,the design of the treatment can provide reference for similar treatment.

山区高速公路地形、地质复杂多变,受路线整体走向制约,结合地形地质条件展线,阳洞滩地段采取了左右线分离式、两线标高错台设计的短隧道群方案通过;其中阳洞滩2号隧道穿越崩塌堆积体、危岩区,设计采用抗滑抗偏压明洞、浅埋偏压破碎围岩段暗洞复合衬砌、路基锚拉桩板墙等工程措施相结合通过该不良地质地段,并在隧道群间短路基段设置减光格栅诱导结构,有效地提高了隧道群的行车舒适性.

城市交通隧道的建设过程中不可避免地遇到工程建设与环境保护的矛盾.该文以穿越生态园区的普瑞隧道的建设为背景,探讨了建设空间狭小、建设条件苛刻、地质条件差、环境保护要求高的条件下,城市交通隧道的方案论证过程和设计思路.通过分析计算,得到了普瑞隧道深大异形基坑的支护方案和大跨度明洞隧道结构的修建方案,确保了工程安全、先进和环保.

刘家排隧道施工中出现了瓦斯等有害气体,针对这一地质情况设计部门及时地调整了衬砌设计方案,并制定了详细的施工措施,保证了隧道建设安全。本文主要介绍了瓦斯区域隧道衬砌的设计考虑及相关的预案研究结果,可供同行参考。

介绍了湖南省某高速公路偏压、浅埋连拱隧道在施工过程中出现的初期支护破坏、二次衬砌开裂等病害,分析了病害产生的原因,并介绍了病害处治采用的回填反压、围岩注浆加固、结构抽换、裂缝嵌补等病害综合处治措施,为隧道病害处治提供一种思路和借鉴.

对吉怀高速公路大坡岭连拱隧道怀化端洞口一侧位于山体内、一侧浅埋段各种设计方案进行必选,对连拱隧道在洞口段一侧位于山体内、一侧浅埋情况,浅埋侧采用明挖、暗挖、暗洞明作方案进行比较研究,为连拱隧道在隧道轴线与地形等高线斜交情况出洞,设计方案选择提供决策借鉴.