摘要
滑移−弯曲破坏是顺层岩质边坡的常见破坏模式之一。基于板裂结构顺层岩质边坡的地质成因分析,将最大拉应力强度理论引入到地质力学模型分析中;根据破坏特征,将板裂结构顺层岩质边坡的岩层带分为滑移段和弯曲段;采用能量法、Rayleigh-Ritz方法及势能驻值原理等近似模拟弯曲段的挠曲方程;运用梁板强度理论,推导了板裂结构顺层岩质边坡最大拉应力计算公式和边坡潜在破坏点预测模型;在此基础上,将理论公式程序化,通过典型滑坡算例,得到了理论预测值与实际破坏值的近似一致性;通过FLAC^(3D)数值模拟软件分析了山阳滑坡的破坏过程,并得出:(1)滑坡体总位移的变化趋势呈现出明显的滑移−弯曲变化特征;(2)最大拉应力和张拉塑性区所在位置的数值模拟结果与理论计算结果近似一致。
Sliding-bending failure is one of the common modes in bedding rock slopes.In this paper,we analyzed the geological origin of bedding rock slopes with slab-rent structure,and applied the theory of maximum tensile stress to the analysis of geomechanical models.According to the damage characteristics,the sliding-bending rock stratum was divided into two parts:the sliding section and the bending section.Then,the energy method,the Rayleigh-Ritz method,and the stationary value theory of total potential energy were used to simulate the equation of deflection curve approximatively.Besides,the formulae for calculating the maximum tensile stress and for the prediction model of potential failure location in bedding rock slopes with slab-rent structure were deduced based on the beam-plate theory.On this basis,the theoretical formula was programed and the approximate consistency between the theoretical prediction value and the accrual failure value was obtained through calculating the typical failure slope.Finally,the failure process of Shanyang landslide was analyzed by FLAC^(3D)numerical simulation software and the following conclusions were drawn:(1)The variation trend of the total displacement was characterized by obvious sliding-bending variation.(2)The numerical simulation results of the maximum tensile stress and the location of the tensile plastic zone were approximately consistent with the theoretical results.
作者
杨肖锋
鲁祖德
陈从新
孙朝燚
刘轩廷
YANG Xiao-feng;LU Zu-de;CHEN Cong-xin;SUN Chao-yi;LIU Xuan-ting(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2022年第S01期258-266,共9页
Rock and Soil Mechanics
基金
国家重点研发计划(No.2017YFC0805307)
国家自然科学基金资助项目(No.41202225)
中科院青年创新促进会资助项目(No.2015271).
关键词
板裂结构
顺层岩质边坡
滑移-弯曲破坏
力学模型
slab-rent structure
bedding rock slope
sliding-bending failure
mechanical model
作者简介
第一作者:杨肖锋,男,1995年生,硕士研究生,主要从事边坡稳定性方面的研究。E-mail:1757660126@qq.com;通讯作者:鲁祖德,男,1981年生,博士,副研究员,主要从事岩石力学试验与边坡稳定性方面的研究工作。E-mail:zdlu@whrsm.ac.cn
