成兰铁路高陡边坡稳定性分析及加固措施  

Stability analysis and reinforcement measures of high and steep slope of Cheng-Lan Railway

作　　者：程爱平[1,2] 燕彦君 李健 张玉山[1,2] 戴顺意 董福松 CHENG Aiping;YAN Yanjun;LI Jian;ZHANG Yushan;DAI Shunyi;DONG Fusong(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Resources,Wuhan University of Science and Technology,Wuhan 430081,China;Institute of Railway Construction,China Academy of Railway Sciences Group Co.,Ltd.,Beijing 100081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《武汉大学学报（工学版）》2021年第6期515-523,578,共10页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51604195);湖北省自然科学基金项目(编号:2018CFC818);金属矿山高效开采与安全教育部重点实验室开放基金项目(编号:ustbmslab201704)。

摘　　要：在我国铁路建设过程中,线路不可避免地布置在高陡边坡坡脚,因此开展高陡边坡稳定性分析及加固措施研究显得十分重要。通过工程实例,利用有限元强度折减法计算了边坡安全系数,运用不平衡推力法获取边坡的滑坡推力,提出了双排抗滑桩支护的加固方案;通过数值模拟与现场监测综合分析双排抗滑桩的加固效果,并结合降雨和地震工况,开展了不同工况下双排抗滑桩桩后土体变形以及桩前土压力分布规律研究。研究结果表明:1)双排抗滑桩对高陡边坡有较好的加固效果;2)2种不利工况下,边坡位移变化规律基本一致,后排抗滑桩桩后位移更大,前排抗滑桩桩前土压力在滑面位置处发生突增;3)双排抗滑桩能有效防治边坡塑性变形,对双排抗滑桩桩间土塑性变形防治尤为明显。研究结果可为双排抗滑桩在高陡边坡加固中提供指导。In the process of railway construction in China,railway lines are inevitably arranged at the foot of the high and steep slope,so it is very important to carry out the stability analysis of the high and steep slope and study the reinforcement measures.In this paper,the safety factor of the slope is calculated by using the finite element strength reduction method,and the landslide thrust of the slope is obtained by using the unbalanced thrust method,and a reinforcement scheme of double-row anti-slide pile support is proposed.By means of numerical simulation and field monitoring,the reinforcement effect of double-row anti-slide piles is comprehensively analyzed.Combined with rainfall and seismic conditions,the soil deformation behind the double-row anti-slide piles and the distribution laws of earth pressure in front of the piles under different working conditions were studied.The results show that:1)the double-row anti-slide pile has good reinforcement effect on the high and steep slope;2)under the two adverse working conditions,the change rules of slope displacement are basically the same,the displacement behind the anti-slide pile in the back row is greater,and the earth pressure in front the anti-slide pile in the front row increases abruptly at the sliding surface position;3)the double-row anti-slide piles can effectively prevent the plastic deformation of the slope,especially the plastic deformation of the soil between the double-row anti-slide piles.The results can provide guidance for double-row anti-slide piles in the reinforcement of high and steep slope.

关 键 词：高陡边坡 双排抗滑桩 土压力 不平衡力法 数值模拟 

分 类 号：TU473[建筑科学—结构工程]