摘要
地震作用是引起斜坡失稳的重要因素,而处于蠕动变形状态的不稳定斜坡对地震荷载具有更强的敏感性。为探究蠕滑型斜坡的地震响应问题,选取了位于陕南山区的一处不稳定斜坡为研究对象,采用Geo-Studio数值模拟方法,在多级地震强度下对斜坡的稳定性、坡体变形、PGA放大系数等要素展开研究。模拟结果显示,该斜坡发生蠕动变形后稳定性大幅下降,地震惯性力随高程不断增加并在坡面出现最大值,PGA放大系数在滑带处产生突变,增强了斜坡地震响应,极大弱化了坡体抗滑能力;随着地震强度不断增大,坡体中积累了更大的永久位移以及显著变形,最后将导致斜坡会在大于0.1g峰值加速度时沿滑带下滑失稳。研究结果可为午子山不稳定斜坡的抗震设防、治理以及该类斜坡的地震响应研究提供借鉴。
Seismic action is an important factor of slope instability,and unstable slopes in a state of creep deformation have stronger sensitivity to seismic loads.In order to explore the seismic response of a creeping slope,an unstable slope located in the mountainous area of southern Shaanxi was selected as the research object.Using the Geo-Studio numerical simulation method,the stability,slope deformation,PGA amplification factor,and other factors of the slope were studied under multi-level seismic intensity.The simulation results show that the stability of the slope significantly decreases after creep deformation,and the seismic inertia force increases continuously with elevation and reaches its maximum value on the slope surface.The sudden change of PGA amplification factor at the sliding zone enhances the seismic response of the slope and greatly weakens the anti sliding ability of the slope.As the seismic intensity continues to increase,greater permanent displacement and significant deformation accumulate in the slope body,ultimately leading to the slope sliding and instability along the sliding zone when the peak acceleration is greater than 0.1 g.The research results can provide reference for the seismic design,treatment,and seismic response research of unstable slopes in Wuzishan.
作者
白雪松
赵洲
杨泽
Bai Xuesong;Zhao Zhou;Yang Ze(College of Urban Rail Engineering,Shaanxi Railway Institute,Weinan 714000,China;College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《能源与环保》
2023年第12期204-210,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国土资源部黄土地质灾害重点实验室开放基金项目(KLGLAMLR201603)
陕西铁路工程职业技术学院研究生专项(KY2022-52)。
