Theoretical research on rock unloading mechanical characteristics

GUO Jian-qiang; LIU Xin-rong; ZHAO Qing

doi:10.16285/j.rsm.2017.S2.016

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Theoretical research on rock unloading mechanical characteristics

更新时间：2026-06-25

- Theoretical research on rock unloading mechanical characteristics
- Vol. 38, Issue S2, Pages: 123-130(2017)
- 作者机构：
  
  1. 贵州大学土木工程学院,贵州,贵阳,550003
  2. 重庆大学土木工程学院,重庆,400045
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.S2.016
  CLC： TU452
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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GUO Jian-qiang, LIU Xin-rong, ZHAO Qing. Theoretical research on rock unloading mechanical characteristics[J]. 2017, 38(S2): 123-130.
DOI：

GUO Jian-qiang, LIU Xin-rong, ZHAO Qing. Theoretical research on rock unloading mechanical characteristics[J]. 2017, 38(S2): 123-130. DOI： 10.16285/j.rsm.2017.S2.016.

摘要

采用卸载状态岩石的力学参数和相应的强度准则，描述卸荷岩体的力学性质可能存在一些不足之处。为了能够从理论上更准确地分析卸荷岩体的力学性质，从弹性应变能出发对卸荷岩体力学性质的演化进行了探讨，研究了岩体的开挖卸荷与卸荷试验中试样初始损伤程度的不同之处和弹性应变能、应力偏量第二不变量、应力张量第二不变量和泊松比内在关系，简要地分析了现有强度准则在描述卸荷岩体力学性质方面的不足之处。以弹性应变能为基础采用加载状态的岩石力学参数，对岩石的卸荷力学特性进行了理论分析与试验验证。结果表明，现有的大多数强度准则难以描述试样卸荷破坏时强度特征，且可能存在不满足能量守恒定律的情况；基于弹性应变能强度准则既可得到表征卸荷破坏时岩石的强度提高，又可以描述强度的减小。文中分析了产生上述结果的本质机理。

Abstract

The mechanical features based on unloading mechanical parameters are not accordant with the mechanical characteristics of rock under unloading condition; in order to construct strength criterion which is widely used and accordant with characters of unloading rock

the work and results are carried out as fellows. Firstly

different initial damage levels between unloading experiment of rocks and underground engineering under excavation unloading conditions are discassed. Secondly

the internal relations between elastic strain energy

the second invariant of stress deviator

the second invariant of stress tensor and Poisson’s ratio are explored. Thirdly

the internal relations between elastic strain energy and strength criterion are also explored. Lastly

based on elastic strain energy

the mechanical features of rocks under unloading condition are studied by using loading mechanical parameters. The experiment results show that existed strength criterion is possible to violate the first thermodynamic law or the law of conservation of energy. It is suitable to increase or decrease for the limited bearing loads of rock under the range of unloading condition based on elastic strain energy

and the mechanism of above-mentioned result is analyzed.

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