岩质边坡开挖支护过程及其稳定性分析  

The Excavation and Support of a Rock Slope and Its Stability Analysis

作　　者：王飞 史旭波 冯世开 WANG Fei;SHI Xubo;FENG Shikai(China Hebei Construction&Geotechnical Investigation Group Co.Ltd.,Shijiazhuang 050200)

机构地区：[1]中冀建勘集团有限公司,石家庄050200

出　　处：《土工基础》2023年第2期173-177,共5页Soil Engineering and Foundation

摘　　要：随着经济建设的发展,面临着越来越多的岩质边坡开挖支护问题,边坡开挖过程稳定性的研究就愈发重要。对某山区地铁车站工程岩质边坡建立Midas-GTS-NX三维数值分析模型,分析了在岩质边坡开挖的不同阶段,边坡的应力分布规律、边坡边缘路面的沉降规律、挡土结构的位移变化规律,研究结果表明:边坡初始状态下边坡的稳定系数为1.10,处于稳定状态,边坡开挖引起基坑底部出现较大的应力集中现象,但剪应力值小于砂岩岩石结构的抗剪强度值,该工程不会出现剪切破坏;由于对边坡顶部的土体进行了加固,边坡顶部在开挖过程中的位移变形值较小,对路面结构不会产生破坏;对于边坡上部挡土墙在不同边坡开挖阶段的水平位移值、切向位移值和沉降值,模拟结果均小于现场监测值,但模拟结果变化趋势与现场监测值相同,且挡土墙在边坡开挖过程中的位移值均处于稳定范围内。研究成果可以为相同类型的工程提供参考。With the continuous development of urban areas,there are more and more rock slope excavation and support problems,and the research on the stability of the slope excavation process becomes more and more important.This study intends to establish a Midas-GTS-NX three-dimensional numerical analysis model for a rock slope of a subway station in the mountainous area and analyze the stress distribution within the slope and the settlement of the road surface at the crest of the slope during the different stages of rock slope excavation.The study results show that the stability factor of safety of the slope is 1.10 in the initial state of the slope,and it is in a marginal stable state.The excavation of the slope causes a large stress concentration phenomenon at the bottom of the excavation area,but the shear stress value less than the shear strength value of the sandstone rock structure,the foundation excavation project will not have shear failure;due to the reinforcement of the soil at the top of the slope,the displacement and deformation value of the crest of the slope during the excavation process is small,which will affect the road surface.The rock slope structure will not be damaged;for the horizontal displacement value,tangential displacement value and settlement value of the upper retaining wall of the slope at different slope excavation stages,the simulation results are all less than the on-site monitored values,but the trend of the simulation results is the same as the on-site monitored data.The same,and the displacement values of the retaining wall during the slope excavation are all within the stable range.These study results can provide references for the similar type of projects.

关 键 词：岩质边坡 数值模拟 分步开挖 应力分布 位移 

分 类 号：TU457[建筑科学—岩土工程]