A Method for Evaluating the Maximum Bending Degree of Flexural Toppling Rock Masses Based on the Rock Tensile Strain-Softening Model  

作　　者：Jiongchao Wang Jun Zheng Jichao Guo Qing Lü Jianhui Deng 

机构地区：[1]Department of Civil Engineering,Zhejiang University,Hangzhou,310058,China [2]Center for Balance Architecture,Zhejiang University,Hangzhou,310007,China [3]State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu,610065,China

出　　处：《Journal of Earth Science》2024年第4期1243-1253,共11页地球科学学刊（英文版）

基　　金：funded by the National Natural Science Foundation of China(No.41972264);Zhejiang Provincial Natural Science Foundation of China(No.LR22E080002);the Key R&D Project of Zhejiang Province(No.2021C03159).

摘　　要：Flexural toppling occurs when a series of layered rock masses bend towards their free face.It is important to evaluate the maximum bending degree and the requirement of supports of flexural toppling rock mass to prevent rock mass cracking and even failure leading to a landslide.Based on the rock tensile strain-softening model,this study proposes a method for calculating the maximum curvature(C_(ppmax))of flexural toppling rock masses.By applying this method to calculate Cppmax of 9 types of rock masses with different hardness and rock layer thickness,some conclusions are drawn:(1)the internal key factors affecting C_(ppmax)are E^(⋆)(E^(⋆)=E_(ss)/E_(0),where E_(0)and E_(ss)are the mean deformation moduli of the rock before and after reaching its peak tensile strength,respectively),the strainεt corresponding to the tensile strength of rock,and the thickness(h)of rock layers;(2)hard rock layers are more likely to develop into block toppling than soft rock layers;and(3)thin rock layers are more likely to remain in flexural toppling state than thick rock layers.In addition,it is found that C_(ppmax)for flexural toppling rock masses composed of bedded rocks such as gneiss is related to the tensile direction.

关 键 词：flexural toppling rock mass maximum bending degree strain-softening model curvature rock mechanics 

分 类 号：TU45[建筑科学—岩土工程]