考虑砂岩残余强度的二元结构深挖路堑   边坡稳定性分析

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (5): 106-114.

考虑砂岩残余强度的二元结构深挖路堑边坡稳定性分析

叶帅华^*1,2, 樊黎明^1,2, 时轶磊^1,2

1.兰州理工大学甘肃省土木工程防灾减灾重点实验室, 甘肃兰州 730050;
2.兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 甘肃兰州 730050

收稿日期:2019-03-20 出版日期:2021-10-28 发布日期:2021-11-18
通讯作者: 叶帅华(1983-),男,河南巩义人,博士,教授.Email:yeshuaihua@163.com
基金资助:
国家自然科学基金(51768040,51508256),兰州市科技发展计划项目(2015-3-131),甘肃省建设科技攻关计划项目(JK2015-5)

Analysis of deep cutting dualistic structure slope stability considering residual strength of sandstone

YE Shuai-hua^1,2, FAN Li-ming^1,2, SHI Yi-lei^1,2

1. Key Laboratory of Disaster Prevention Mitigation in Civil Engineering of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2019-03-20 Online:2021-10-28 Published:2021-11-18

摘要/Abstract

摘要： 在西部地区的公路工程中出现了大量二元结构深挖路堑边坡,对此类边坡稳定性分析中的岩体材料强度取值依然没有明确定论.以兰永一级公路为背景,将发生失稳的K35+000~150标段黄土-砂岩二元结构边坡的破坏形式作为参照,在分析该深挖路堑边坡破坏原因的基础上,选取该标段上一典型断面,采用有限元软件研究坡底砂岩分别处于峰值强度和残余强度两种不同强度指标下的深挖路堑边坡的稳定性以及边坡的变形破坏特征,并基于残余强度下的边坡模型,研究预应力锚杆加固对边坡稳定性的影响.结果表明:以残余强度为基础对边坡稳定性进行分析更为贴合此类边坡工程的实际状况,边坡若能在开挖过程中采用预应力锚杆支护底部基岩层将有效提高边坡稳定性从而阻止坡体失稳发生.研究结果可为今后甘肃地区黄土-砂岩二元结构高边坡的稳定性分析提供参考.

关键词: 深挖路堑边坡, 砂岩, 残余强度, 稳定性

Abstract: A large number of dualistic structure slopes occurred during the construction of highways in western China, but the strength of the rock mass material in the stability analysis of such slopes is still unclear. Taking the slope engineering of Lanyong high way as background, the cause of the damage of adualistic structure slope composed of loess and sandstone in K35+000~150 of Lanyong high way was analyzed.Choosing a typical section of the slope engineering, FEM was usedto compare the stability and the destruction characteristics of the deep cutting slope under two different situations that the sandstone was respectively at peak strength and residual strength. Moreover, based on residual strength, the effects of prestressed anchors on the slope stability was studied. The results show that the result calculated by residual strength is more suitable forthe actual failure of the dualistic structure slope and that if the slope can be supported by prestressed anchors, the slope stability would be effectively improved to preventthe slope instability.The research results can provide references for the stability analysis of loess-sandstone dualistic-structure high slope in Gansu Province.

Key words: deep cutting slope, sandstone, residual strength, stability

中图分类号:

U417.1+1

叶帅华, 樊黎明, 时轶磊. 考虑砂岩残余强度的二元结构深挖路堑边坡稳定性分析[J]. 兰州理工大学学报, 2021, 47(5): 106-114.

YE Shuai-hua, FAN Li-ming, SHI Yi-lei. Analysis of deep cutting dualistic structure slope stability considering residual strength of sandstone[J]. Journal of Lanzhou University of Technology, 2021, 47(5): 106-114.

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