地震作用下锚固边坡稳定性数值分析  

NUMERICAL ANALYSIS ON STABILITY OF SLOPES SUPPORTED WITH BOLTS UNDER EARTHQUAKE

作　　者：彭宁波[1] 言志信[1] 刘子振[1,2] 蔡汉成[1] 

机构地区：[1]兰州大学土木工程与力学学院西部灾害与环境力学教育部重点实验室,兰州730000 [2]台州学院建筑工程学院,台州318000

出　　处：《工程地质学报》2012年第1期44-50,共7页Journal of Engineering Geology

基　　金：高等学校博士学科点专项科研基金资助课题(20090211110016);云南省交通厅科技项目(云交科2010(A)06-b)

摘　　要：地震诱发的边坡失稳是一种重要的地震地质灾害类型,本文结合工程实例,利用有限差分软件FLAC3D建立了一个边坡的数值分析模型。对比分析了静力状态下锚固前后边坡的塑性区、水平位移和滑移面,地震作用下锚固前后边坡的塑性区、各个时刻的水平位移、锚杆轴力分布和塑性状态,然后分析了边坡的稳定性,并探讨了边坡破坏的机理。数值分析结果表明:锚杆对边坡的加固效果十分显著;锚杆在发挥锚固作用时主要受拉,且随着锚杆位置高程的增加,锚杆的轴力减小;有无锚杆支护的边坡在地震作用下的破坏方式不同。研究结果为锚固边坡的抗震设计提供了参考依据。Slope failure is a major type of geological hazard induced by earthquake.Combining with the engineering project,a numerical simulation model of soil slope is established with the FLAC3D program.The paper examines and compares the plastic zone,horizontal displacement and the fracture surface of slope whether supported with bolts or not under static state,and the axial force of bolts,the plastic zone,horizontal displacement and plastic state of slope whether supported with bolts or not under stability of the slope with and without bolts at different time under static state and earthquake.It distinguishes the stability of slopes and discusses the failure mechanism of slopes.It is shown that,the bolts for slope have very good supporting role.Bolts in supporting role plays the role mainly by pulling force,and along with the increase of elevation and the decreases of axial force.Slope with or without bolts under earthquake can be damaged in different ways.Research results can be the reference frame for the design of slopes supported with bolts under earthquake.

关 键 词：边坡 锚杆 地震 稳定性 数值模拟 

分 类 号：P642.23[天文地球—工程地质学]