基于流固耦合理论的巴东黄土坡滑坡地震响应研究  

Study on Seismic Stability of Badong Huangtupo Landslide Based on Fluid Solid Coupling Theory

作　　者：张洁[1] 曾金明[2] 胡其志 游姗 付小红[1] ZHANG Jie;ZENG Jinming;HU Qizhi;YOU Shan;FU Xiaohong(School of Urban Construction,Wuchang Institute of Technology,110 Baishazhou Road,Wuhan 430065,China;CCCC Second Highway Consultants Co Ltd,18 Chuangye Road,Wuhan 430056,China;School of Civil Architecture and Environment,Hubei University of Technology,28 Nanli Road,Wuhan 430068,China)

机构地区：[1]武昌工学院城市建设学院,武汉市430065 [2]中交第二公路勘察设计研究院有限公司,武汉市430056 [3]湖北工业大学土木建筑与环境学院,武汉市430068

出　　处：《大地测量与地球动力学》2023年第10期1051-1055,1067,共6页Journal of Geodesy and Geodynamics

基　　金：湖北省教育厅科学研究计划(B2022363);武昌工学院校级科学研究项目(2021KY10)。

摘　　要：为研究三峡蓄水对湖北巴东黄土坡滑坡地震稳定性的影响,基于流固耦合理论建立二维有限差分数值模型。在计算无水(蓄水前)及有水(175 m实验性蓄水)条件下滑坡体场地地震动、应力响应及孔隙水压力差异特征的基础上,进一步给出滑坡体安全系数时程,探讨在蓄水与水库地震共同作用下的滑坡体稳定性及成因机理。结果表明:1)无水条件下滑坡体上硬层与下硬层的地震动峰值加速度放大系数约为1.33及3.31,具有显著的场地放大效应及软弱夹层消能减震作用;2)瞬时地震荷载下,由于滑坡体上下硬层之间非协调性变形与非快速排水的共同作用,软弱层超孔隙水压力快速形成,并呈现出阶段性积累上升趋势,伴有瞬时放大特征。To study the influence of the Three Gorges impoundment on the seismic stability of the Badong Huangtupo landslide,we establish a two-dimensional finite difference numerical model based on the fluid solid coupling theory.On the basis of calculating the difference characteristics of site ground motion,stress response and pore water pressure of the landslide without water(before impoundment)and with water(175 m experimental impoundment),we give the time history of landslide safety coefficient,and discuss the landslide stability and its genesis mechanism under the combined action of impoundment and reservoir earthquake.The results show that:1)The peak ground vibration acceleration of the upper and lower hard layers of the landslide under water condition is about 1.33 and 3.31 times,which has a significant site amplification effect and the influence of energy dissipation and seismic reduction of the soft interlayer.2)Under transient seismic loading,due to the joint action of uncoordinated deformation and non-rapid drainage between the upper and lower hard layers of the landslide,the excess pore water pressure of the soft layer is formed rapidly and shows a phase accumulation rise,accompanied by the characteristics of transient amplification.

关 键 词：三峡蓄水 流固耦合 水库地震 孔隙水压力 黄土坡滑坡 

分 类 号：P315[天文地球—地震学]