某高速公路边坡监测及稳定性模拟分析

MONITORING AND STABILITY SIMULATION ANALYSIS OF A CERTAIN EXPRESSWAY SLOPE

以某高速公路K 303+460~K 303+590段滑坡病害为对象,结合现场调查及深层水平位移监测分析其产生的主要因素,采用Midas GTS NX有限元软件数值模拟降雨入渗作用下该边坡的稳定性。结果表明:该路段山体滑坡是地层岩性、地质构造、超强降水以及修建高速时路堑开挖综合作用的结果;模拟显示,连续3 d强降雨作用下,边坡的安全系数逐渐减小,从自然状态下的1.289降至1.159,连续降雨3 d后安全系数下降10.1%,且滑裂带逐渐向坡底扩展。

Taking the landslide disease of K303+460~K303+590 section of a expressway as the object, combined with on-site investigation and deep horizontal displacement monitoring, the main factors of the landslide were analyzed, and the Midas GTS NX finite element software was used to simulate the stability of the slope under rainfall infiltration. The results show that the landslide in this section is the result of the comprehensive effect of stratigraphic lithology, geological structure, super precipitation and cutting excavation during highway construction. The simulation shows that under the action of heavy rainfall for three consecutive days, the safety factor of the slope gradually decreases, from 1.289 in the natural state to 1.159, and the safety factor decreases by 10.1% after three consecutive days of rainfall, and the slip zone gradually expands to the bottom of the slope.