Research on energy characteristics of size effect of granite under low / intermediate strain rates

LIANG Chang-yu; LI Xiao; WU Shu-ren

doi:10.16285/j.rsm.2016.12.016

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Research on energy characteristics of size effect of granite under low / intermediate strain rates

更新时间：2026-06-25

- Research on energy characteristics of size effect of granite under low / intermediate strain rates
- Vol. 37, Issue 12, Pages: 3472-3480(2016)
- 作者机构：
  
  1. 中国地质科学院地质力学研究所国土资源部新构造运动与地质灾害重点实验室,北京,100081
  2. 中国科学院地质与地球物理研究所工程地质力学重点实验室,北京,100029
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.12.016
  CLC： TU45
- Online First：09 June 2018，
  
  Published：2016
- 稿件说明：
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LIANG Chang-yu, LI Xiao, WU Shu-ren. Research on energy characteristics of size effect of granite under low / intermediate strain rates[J]. 2016, 37(12): 3472-3480.
DOI：

LIANG Chang-yu, LI Xiao, WU Shu-ren. Research on energy characteristics of size effect of granite under low / intermediate strain rates[J]. 2016, 37(12): 3472-3480. DOI： 10.16285/j.rsm.2016.12.016.

摘要

能量相互转化过程的综合作用导致了岩石破坏，而其破坏的根本原因是岩石中储存的应变能的释放。对中低应变率加载条件下岩石尺寸效应能量特征的研究结果表明：花岗岩破坏时吸收的总能量U、弹性应变能Ue以及损伤应变能Ud均随试件尺寸的增长而降低；岩石强度与岩石中储存的能量有关，尤其与弹性储能有关，即弹性应变能愈高，岩石强度越大；试件长度由50 mm 变为125 mm时，弹性储能逐渐降低，岩石破坏形态从劈裂破坏变为剪切破坏，大尺寸时局部化变形明显。能量是不同应变率加载条件下岩石破坏细微观及宏观特征存在差异的内在动力；亦是导致岩石强度存在尺寸效应的本质动因。

Abstract

The fracture of rock is the results of a comprehensive role in the process of energy conversion

and the release of the strain energy stored is the essence of rock abrupt failure. The energy characteristics of rock size effect under low / intermediate strain rates have been studied. It is found that the total energy U

the elastic energy Ue and the damage energy Ud at failure decrease with the increasing sample size. Rock strength is related to the stored energy

especially to the stored elastic energy

namely the more the elastic energy

the higher the strength. The stored elastic energy reduces gradually with the specimen length changing from 50 mm to 125 mm. Splitting is the main fracture mode for the short specimens while the shearing fracture mode dominates the longer specimens with evident strain localization. Energy is the inherent impetus which leads to differences of failure in micro

meso and macroscopic characteristics under different strain rates

which is also the intrinsic motivation of the size effect of rock strength.

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Related Institution

Faculty of Electric Power Engineering, Kunming University of Science and Technology

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Faculty of Civil and Architectural Engineering, Kunming University of Science and Technology

School of Civil Engineering, Guizhou University

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