Tests on hydro-mechanical coupling characteristics of fractured limestone in complete stress-strain process

被引：0

作者：

Zhao Y. ^{[1
,2
]}

Fu C. ^{[1
]}

Wang Y. ^{[3
]}

Tang J. ^{[1
]}

Zhou Z. ^{[1
]}

Wan W. ^{[1
]}

机构：

[1] Work Safety Key Laboratory on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, Hunan

[2] State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Xuzhou, 221008, Jiangsu

[3] School of Civil Engineering, Hefei University of Technology, Hefei, 230009, Anhui

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2016年 / 35卷

基金：

中国国家自然科学基金;

关键词：

Complete stress-strain process; Hydro-mechanical coupling; Permeability; Rock mechanics; Strength;

D O I：

10.13722/j.cnki.jrme.2016.0866

中图分类号：

学科分类号：

摘要：

To clarify mechanical and permeability characteristics of fractured limestone in complete stress-strain process, the hydro-mechanical coupling tests on fractured limestone at various seepage pressures and confining pressures were performed, and the strength and deformation characteristics of fractured limestone under the hydro-mechanical coupling were studied. The six key permeability values in complete stress-strain process were defined. The results showed that the mechanical characteristics of fractured limestone are sensitive to seepage pressure, which reduces rock strength and deformation modulus, activating the lateral deformation of fractured limestone. The strength characteristics of fractured limestone can be characterized by the Mohr-Coulomb yield criterion under the hydro-mechanical coupling; The permeability values display four stages of decrease-gradual increase-rapid increase-small drop in complete stress-strain process, which roughly correspond to volumetric compression stage, elastic deformation stage, failure stage near peak strength point and residual strength, respectively. At low seepage pressure(about 2MPa), the correspondence above is perfect. However, at high seepage pressure(above 8MPa), there is a deviation from the correspondence above, i.e. permeability reduction stage is shorter than the stage of volumetric compression. A negative exponential equation can describe the relationship between permeability and volumetric strain in volumetric compression stage at low seepage pressure (about 2MPa). At high seepage pressure(above 8MPa), a cubic polynomial can be used to describe the relationship between permeability and volumetric strain in volumetric compression stage. © 2016, Science Press. All right reserved.

引用

页码：3763 / 3773

页数：10

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