Mechanical properties evolution of thermally damaged limestone under triaxial cyclic loading and unloading

被引：0

作者：

Zhang X. ^{[1
,2
]}

Xu J. ^{[1
,2
]}

Sun L. ^{[1
,2
]}

Zhang H. ^{[1
,2
]}

Wang Q. ^{[1
,2
]}

机构：

[1] School of Mines, China University of Mining and Technology, Xuzhou

[2] State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou

来源：

Journal of Mining and Strata Control Engineering | 2022年 / 4卷 / 04期

关键词：

brittleness index; cyclic loading and unloading; damage variable; mechanical characteristics; temperature;

D O I：

10.13532/j.jmsce.cn10-1638/td.20220318.001

中图分类号：

学科分类号：

摘要：

In order to investigate the temperature-peripheral pressure effects on rock mechanical properties under cyclic loading and unloading，five temperature gradient limestone triaxial compression tests under cyclic loading and unloading were carried out，and the influence of different temperatures and confining pressures on rock characteristic mechanical parameters was analyzed. The evaluation indexes of rock failure form and damage are described. The results show that： ① The mechanical properties of rocks are manifested by the effects of confining pressure strengthening and temperature deterioration. The greater the temperature and confining pressure，the post-peak stress decreases slower lead the rock can withstand more number of cyclic loading and unloading and produce with the greater the amount of plastic deformation； ② The smaller the brittleness index，the ductility of the rock is stronger. In contrast，the brittleness of rock is stronger. When the confining pressure and temperature increase，the rock failure form changes from brittle failure to ductile failure； ③ With the increase of the number of cyclic loading and unloading，the rock damage variable increases non-linearly and increases rapidly in the post-peak stage. The research results provide a reference for the stability analysis of surrounding rock under high temperature conditions. © 2022 Science Press. All rights reserved.

引用

共 25 条

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