摘要
针对蠕动型滑坡位移监测预警中滑坡稳定性难以准确判定的问题,利用FLAC3D数值软件建立土质边坡数值计算模型,基于强度折减系数法分析滑坡变形过程中的表面位移和内部应力变化规律,构建蠕动型滑坡的失稳判据,并用于相似试验验证和实际滑坡案例分析。结果表明:蠕动型滑坡发生、发展至滑移破坏过程中,内部破坏特征在宏观上可通过滑坡地表位移变形来反映;滑坡地表位移随滑坡破坏程度呈现出规律性的变化,且在滑坡稳定性阶段发生变化时滑坡地表位移会出现突变性的拐点;依据滑坡位移变化规律建立的失稳判据得到的滑坡稳定状态与实际情况相符,验证了所建失稳判据在实际工程中的适用性。
To address the difficulty for evaluating the stability of creeping landslides identified in displacement monitoring and warning,the numerical calculation model of soil slope is established by using the software FLAC3D,and the surface displacement and inner stress evolution law of creeping landslides was analyzed based on the strength reduction method of FEM.As a result,the instability criterion of creeping landslides was established,which was then verified by laboratory experiment and applied to typical creeping landslide cases analysis.The results indicate that the internal failure characteristics of creeping landslides during the occurrence and development to slip failure can be reflected by landslide surface displacement.And the landslide surface displacement not only changes regularly with the degree of landslide failure,but also presents an abrupt inflection point when the landslide stability phase changes.The stability state of the landslide obtained from the instability criterion established based on the landslide displacement change law was in line with the actual condition,proving that such instability criterion is applicable to practical projects.
作者
许波
李静
黄琪嵩
金仁才
钱元弟
XU Bo;LI Jing;HUANG Qisong;JIN Rencai;QIAN Yuandi(School of Civil Engineering and Architecture,Anhui University of Technology,Maanshan 243032,China;China MCC17 Group Co.,Ltd,Maanshan 243000,China;Sinosteel Maanshan Institute of Mining Research Co.,Ltd,Maanshan 243000,China;Maanshan Green Construction Safety Key Laboratory,Maanshan 243002,China)
出处
《安徽工业大学学报（自然科学版）》
CAS
2023年第4期449-454,共6页
Journal of Anhui University of Technology（Natural Science）
基金
安徽省高校自然科学基金项目(KJ2020A0235)
安徽省自然科学基金项目(2008085QE221)
中国博士后科学基金面上项目(2022M712934)
安徽省博士后研究人员科研活动经费资助项目(2021B550,2021B551)。
关键词
蠕动型滑坡
位移变形规律
强度折减法
失稳判据
creeping landslide
displacement deformation law
strength reduction method
stability criterion
