A new shear creep damage model for rock masses after considering initial damage
Author:
Hu Bin,Wang Zeqi,Li Jing,Wei Erjian,Ma Liyao,Liu Ji,Xiaobo Yu
Abstract
For a long time, one of the important safety problems in open-pit mines is the stability of a large number of high slopes with gently inclined soft interlayer. Rock masses formed after long geological processes generally have some initial damage. Mining works also cause varying degrees of disturbance and damage to rock masses in the mining area during the mining process. This phenomenon means that accurate characterization of the time-dependent creep damage for rock masses under shear load is necessary. The damage variable D is defined based on the spatial and temporal evolution laws of shear modulus and initial level of damage for the rock mass. In addition, a coupling damage equation between the initial damage of the rock mass and shear creep damage is established based on Lemaitre’s strain equivalence assumption. Kachanov’s damage theory is also incorporated to describe the entire process of time-dependent creep damage evolution for rock masses. A creep damage constitutive model that can reasonably reflect the actual mechanical properties of rock masses under multi-stage shear creep loading conditions is established. This takes into account multi-stage shear creep loading conditions, instantaneous creep damage during the shear load phase, staged creep damage and factors influencing the initial damage of rock masses. The reasonableness, reliability and applicability of this model are verified by comparing the results of the multi-stage shear creep test with calculated values from the proposed model. As opposed to the traditional creep damage model, the shear creep model established in this present study takes into account the initial damage of rock masses and can describe the multi-stage shear creep damage characteristics of rock masses more convincingly.
Funder
Innovative Research Group Project of the National Natural Science Foundation of China
Hubei Technological Innovation Special Fund
Major Science and Technology Projects of WUST Cultivate Innovation Teams
Publisher
Public Library of Science (PLoS)
Subject
Multidisciplinary
Reference48 articles.
1. A 3D Creep Model considering Disturbance Damage and Creep Damage and Its Application in Tunnel Engineering;GF Wang;Mathematical Problems in Engineering,2020
2. The three stages of stress relaxation—Observations for the time-dependent behaviour of brittle rocks based on laboratory testing;C Paraskevopoulou;Engineering Geology,2017
3. Experimental creep tests and prediction of long-term creep behavior of grouting material;S Nadimi;Arabian Journal of Geosciences,2014
4. Improved nonlinear Burgers shear creep model based on the time-dependent shear strength for rock;H Lin;Environ Earth Sci,2020
5. Rock Slope Design using Q-slope and Geophysical Survey Data;N Bar;Periodica Polytechnica-Civil Engineering,2019
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献