全应力–应变过程中裂隙灰岩的水–力耦合特性试验研究

doi:10.13722/j.cnki.jrme.2016.0866

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Abstract 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 2 MPa)，the correspondence above is perfect. However，at high seepage pressure(above 8 MPa)，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 2 MPa). At high seepage pressure(above 8 MPa)，a cubic polynomial can be used to describe the relationship between permeability and volumetric strain in volumetric compression stage.

Key words： rock mechanics；hydro-mechanical coupling permeability strength complete stress-strain process

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	Articles by authors
	ZHAO Yanlin1
	2
	FU Chengcheng1
	WANG Yixian3
	TANG Jinzhou1
	ZHOU Zhihua1
	WAN Wen1

Cite this article:

ZHAO Yanlin1,2,FU Chengcheng1, et al. Tests on hydro-mechanical coupling characteristics of fractured limestone in complete stress-strain process[J]. , 2016, 35(S2): 3763-3773.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0866 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3763

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