摘要
运用Midas/GTS模拟岩土互层路堑高边坡的开挖过程破坏模式及稳定性,分析岩土层倾角与破坏模式及稳定性之间的关系。结果表明:岩土互层路堑高边坡主要的滑移破坏模式为沿着通过坡脚的土层进行平面滑动,但也可能在坡脚以上的土层先产生滑动;在其他条件相同时,顺倾向边坡的安全系数随岩土层倾角的增大先减小后增大,开挖产生的水平位移先增大后减小,岩土层倾角为30°左右时边坡的安全系数最小,开挖过程中产生的水平位移最大;岩土互层边坡开挖影响范围整体呈现圆弧形,岩层与土层交界处产生"锯齿"状突变。岩土互层边坡的稳定性及开挖变形对土层黏聚力和内摩擦角的敏感性明显大于对岩层黏聚力和内摩擦角的敏感性。
The excavation failure modes and stability of the rock and soil interbedded strata was simulated by Midas/GTS, while the relationship between dip angles of rock and soil interbedded strata and excavation failure modes and stability of the slope is analyzed, calculation results show that： the major failure mode of high cutting rock and soil interbedded strata is carrying out along the plane sliding of the layered soil that on the foot of slope, and possiblly slide at the layered soil above the toe of slope firstly; for consequent rock and soil interbedded strata slope, the total safty factor of siope first increases then decreases with dip angle, and the horizontal displacement of excavation has increased first and then decreased, whert dip angle is 30°, the total safety factor reaches its minimum value and the horizontal displacement during the excavation reaches its maximum value;the slope excavation influence scope like arc, there is “sawtooth” mutationat the junction of rock and soil; stability and the excavation deformation of rock interbedded slope are sensitivity to the soil cohesion and the angle of internal friction significantly greater than the strata＇s.
出处
《四川建筑科学研究》
北大核心
2015年第2期106-111,共6页
Sichuan Building Science
基金
国家科技支撑计划资助项目(2011BAK12B07)
甘肃省自然科学基金资助项目(1208RJZA158)
甘肃省高等学校基本科研业务费项目
关键词
岩土互层
破坏模式
开挖过程
数值分析
稳定性
rock and soil interbedded strata
failure mode
the excavation process
numerical analysis
stability
