期刊论文

Failure Characteristics and Energy Dissipation of the Gypsum Sample in Diffferent Height to Diameter Ratios

中文

南华大学学报(自然科学版)

1673-0062

2015

2

30-36

10.19431/j.cnki.1673-0062.2015.02.008

国家自然科学基金资助项目（51374129）； 南华大学“铀矿山岩土工程灾害预测与控制”校级创新团队计划项目；

本校为第一机构

采用RMT-150 B岩石力学试验机，对七种不同高径比的石膏试样进行了单轴压缩试验，分析其力学特性及其破坏特征。根据单轴压缩力学试验结果，利用能量耗散理论，分析其能量耗散特性。研究结果表明：随轴压应力的增加，石膏试样内部微裂隙先闭合，而后在其尖端产生了新裂隙；新裂隙随轴压应力的增加而逐渐地扩展、贯通、形成破裂面，最终发生剪切滑移破坏；石膏试样的体积应变随轴压应力的增大，经历了先压缩后增加，最后急剧膨胀，表现出明显的非线性变形；石膏试样的峰值应力、弹性模量随高径比的减小而增大；轴向应变和横向应变随高径比的减小而减小；变形模量与高径比之间的关系不明确，不能用...

The uniaxial compression mechanical test of the gypsum sample with seven differ-ent height to diameter ratios were measured by using RMT-150B rock mechanics testing ma-chine,and the mechanical properties and failure characteristics of the gypsum sample were analysed. Based on the test results,the energy dissipation characteristics of the gypsum in different height to diameter ratios were investigated by using the energy dissipation theory. The results show that the microcracks within the gypsum sample is closed firstly,and then produces a new fractures at the tip of the microcracks,and th...