缓倾角红层路堑高边坡应力状态与防护研究  

STUDY ON STRESS STATE AND PROTECTION OF EXCAVATED CUTTING OF HIGH SLOPE IN GENTLY INCLINED RED BEDS

作　　者：赵建昌[1] 李永和[1] 吉随旺[2] 

机构地区：[1]上海大学理学院 [2]四川省交通厅公路规划勘察设计研究院,四川成都610041

出　　处：《岩石力学与工程学报》2005年第A02期5751-5755,共5页Chinese Journal of Rock Mechanics and Engineering

摘　　要：在公路建设中,高边坡越来越成为工程界所面临的一大难题。由于其岩体结构的复杂性,将给边坡稳定性及防护带来一定的困难。以四川红层地区某高速公路建设中的路堑开挖高边坡为原型,采用有限元数值模拟技术,研究了高度为40,50,60,70,80 m,坡比分别为1∶0.5,1∶0.75,1∶1,1∶1.25,1∶1.5的开挖路堑高边坡应力状态。研究结果表明,边坡开挖后剪应力集中带随边坡的坡率由陡变缓而由坡脚向坡顶方向迁移,边坡的潜在破坏面随坡度的由陡变缓而向坡体上部迁移,即当坡体坡比陡于1∶0.75时坡体剪应力集中在坡脚附近,当坡体开挖坡比缓于1∶0.75时剪应力集中位置不在坡脚而在坡体的中上部。依据此结论,提出红层地区开挖路堑高边坡合理的防护模式,可供设计者参考。More and more rock slope problems are met in highway construction. Because of complex structure of rock body, there are many difficulties in calculating and protecting slope stability. The stresses and deformations of excavated cutting of high slope （height 40, 50, 60, 70, 80 m with slope ratao 1 ： 0.5, 1： 0.75, 1 ： 1, 1 ： 1.25, 1 ： 1.5） are calculated as the prototype in gently inclined red beds natural slope of an expressway in Sichuan province, adopting the numerical simulation technology of finite element method（FEM）. The computed results indicate that shearing stress focus zone moves from slope foet to top slope as slope ratio changes from steep to slow and the surface of deformation-failure of slope will also move in this way, i.e., as the excavated slope ratio is greater than 1 ： 0.75, slope body sheafing stress is concentrated near the slope foot; when the excavate slope ratio is lower than 1 ： 0.75, sheafing stress focus zone is not located near the slope foot, but lie in position on the upper side of the middle of slope body. According to this conclusion, a rational protection pattern of rock slope is presented for reference to engineering design.

关 键 词：边坡工程 数值模拟 缓倾角红层 路堑高边坡 坡比 高边坡防护 

分 类 号：U416.14[交通运输工程—道路与铁道工程]