Dip effect of energy evolution mechanism of jointed sandstone under uniaxial compression

被引：0

作者：

Wang G. ^{[1
,2
]}

Wen X. ^{[1
,2
]}

Zhang L. ^{[1
,2
]}

机构：

[1] School of Civil Engineering, Chongqing University, Chongqing

[2] National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Dip effect; Energy evolution; Energy mutation amplitude; Jointed sandstone; Uniaxial test;

D O I：

10.11817/j.issn.1672-7207.2020.07.017

中图分类号：

学科分类号：

摘要：

Based on the indoor uniaxial test and rock energy theory, the energy evolution mechanism of jointed sandstone with different dip angles under uniaxial compression was studied, and the dip effect of the different energy indicators at the peak point and the energy mutation amplitude at the pre-peak and post-peak were analyzed. The results show that the energy evolution process of the jointed sandstone is divided into initial compaction and energy dissipation stage, linear energy storage stage at pre-peak, energy jump and accumulation stage at pre-peak, energy accelerated dissipation stage at pre-peak and energy suddenly released stage at post-peak according to the variation of the energy proportion and the slope of the energy curve of jointed sandstone. Besides, total strain energy and elastic strain energy at the peak point of jointed sandstone exhibit asymmetrical "U" type evolution characteristics with the increase of dip angles of joint. The difficult degree of deformation and failure of rock mass driven by energy is difficult-easy-difficult. Moreover, energy mutation amplitude of jointed sandstone is asymmetrical "inverted V" type with the increase of the dip angles of joint at pre-peak. Mutation damage of the gently dip jointed sandstone is stronger than steep dip jointed sandstone. Last but not the least, energy mutation amplitude of jointed sandstone is asymmetrical "V" type with the increase of the dip angles of joint at post-peak. The rupture degree is firstly decreased and then increased at post-peak, and the smallest rupture degree is the 45° jointed sandstone at post-peak. © 2020, Central South University Press. All right reserved.

引用

页码：1913 / 1923

页数：10

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