循环荷载下干燥与饱和砂岩力学特性及能量演化

doi:10.16285/j.rsm.2017.06.008

›› 2017, Vol. 38 ›› Issue (6): 1600-1608.doi: 10.16285/j.rsm.2017.06.008

循环荷载下干燥与饱和砂岩力学特性及能量演化

汪泓^{1, 2, 3}，杨天鸿¹，刘洪磊¹，赵永川¹，邓文学¹，侯宪港¹

1. 东北大学资源与土木工程学院，辽宁沈阳 110819；2. 贵州大学贵州省非金属矿产资源综合利用重点实验室，贵州贵阳 550025； 3. 贵州大学矿业学院，贵州贵阳 550025

收稿日期:2015-09-28 出版日期:2017-06-12 发布日期:2018-06-05
作者简介:汪泓，男，1979年生，讲师，博士研究生，主要从事岩石力学方面的研究。
基金资助:
国家重点基础研究发展计划项目（No.2013CB227902）；贵州省科技计划项目（黔科合LH字[2016]7465号）；国家自然科学基金项目（No.51574059）。

Mechanical properties and energy evolution of dry and saturated sandstones under cyclic loading

WANG Hong^{1, 2, 3}, YANG Tian-hong¹, LIU Hong-lei¹, ZHAO Yong-chuan¹, DENG Wen-Xen¹, HOU Xian-gang¹

1. School of Resource and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, China; 2. Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guizhou University, Guiyang, Guizhou 550025, China; 3. College of Mining, Guizhou University, Guiyang, Guizhou 550025, China

Received:2015-09-28 Online:2017-06-12 Published:2018-06-05
Supported by:
This work was supported by the National Basic Research Program of China (973 Program) (2013CB227902), Guizhou science and technology plan project (LH[2016]7465) and the National Natural Science Foundation of China (51574059) .

摘要/Abstract

摘要： 对取自陕北榆横矿区小纪汗煤矿顶板砂岩的干燥及饱和试件进行单轴循环加、卸载试验，分析了干燥与饱和状态下岩石的强度和变形特征以及岩石破坏过程中的能量演化与能量分配情况。结果表明：（1）循环加、卸载导致干燥试件的峰值强度较单轴压缩时下降19.47%；（2）饱水对砂岩的强度和变形均有影响，饱和试件的平均峰值强度比干燥试件低39.55%，同时饱和试件具有更加明显的压密阶段；（3）循环加、卸载下砂岩的加载和卸载弹性模量均呈现增大趋势，但饱和试件的弹性模量低于干燥试件；（4）通过峰值强度归一化处理后发现，在应力加载的不同阶段，饱和试件的弹性应变能Ue和耗散能Ud均低于干燥试件；（5）加载过程中，饱和试件弹性应变能Ue的占比高于干燥试件，该比例随着加载过程逐渐下降并在破坏前与干燥试件的Ue的占比达到近似水平。

关键词: 循环加、卸载, 饱和试件, 弹性模量, 能量演化, 弹性应变能占比

Abstract: In this study, uniaxial cyclic loading and unloading experiments were conducted on dry and saturated sandstones from Xiaojihan coal mine in Shaanxi province, respectively. The strength and deformation characteristics of rock and its corresponding energy evolution and distribution during the process were analyzed. It is found that the peak strength of dry specimens under cyclic loading and unloading condition was 19.47% lower than that under uniaxial compression condition. The results demonstrate that the saturation affects both the strength and deformation of sandstone specimens. Compared with dry specimens, the average peak strength of saturated specimens was 39.55% lower, meanwhile, the saturated specimens present more obvious compaction stage. The loading elastic modulus and unloading elastic modulus tend to increase for dry and saturated sandstones. However, the elastic modulus of saturated specimens was lower than that of dry ones. When the peak strength was normalized, the elastic strain energy Ue and the dissipation energy Ud of dry specimens were larger than those of saturated specimens at different stages of stress loading. During the loading process, the proportion of elastic strain energy Ud of saturated specimens was greater than that of dry one. In addition, the Ud proportion of saturated specimens declined gradually during the loading process. The Ue proportions of dry and saturated specimens achieved an appropriate level prior to failure.

Key words: cyclic loading and unloading, saturated specimen, elastic modulus, energy evolution, proportion of elastic strain energy

中图分类号:

TU 458

汪泓，杨天鸿，刘洪磊，赵永川，邓文学，侯宪港,. 循环荷载下干燥与饱和砂岩力学特性及能量演化[J]. , 2017, 38(6): 1600-1608.

WANG Hong, YANG Tian-hong, LIU Hong-lei, ZHAO Yong-chuan, DENG Wen-Xen, HOU Xian-gang，. Mechanical properties and energy evolution of dry and saturated sandstones under cyclic loading[J]. , 2017, 38(6): 1600-1608.

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循环荷载下干燥与饱和砂岩力学特性及能量演化

Mechanical properties and energy evolution of dry and saturated sandstones under cyclic loading

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