鄂西渝东盖层碳质泥页岩的卸荷力学特性试验研究

doi:10.13722/j.cnki.jrme.2015.0148

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Abstract Western Hubei-Eastern Chongqing region is a major exploration block of oil and gas. The area has been suffered long term uplift and erosion，which may resulted in cap rock failure. To investigate the sealing effectiveness of cap rock during geological evolution，a series of triaxial unloading tests of shale samples have been conducted under initial confining pressures of 10，20，30，40，50 MPa. The results show that under different confining pressures，the unloading properties of carbonaceous shale are as follows. During unloading process，lateral strains are greater than axial strains under lower confining pressure，with the increase of confining pressure，lateral strains are less than axial strains；Strength values and strength parameters of unloading tests are both higher than those obtained from conventional triaxial compression tests；The fracture modes are obviously affected by the initial confining pressure：under low initial confining pressure，samples split into several large pieces；with the increasing of confining pressure，the fracture modes gradually transfer to main shear failure；under the confining pressure of 40 MPa，the fracture mode is characterized by occurrence of cracks-net；Also，rupture coefficient of lateral pressure is proposed to evaluate sealing effectiveness of cap rock. Based on the results of tests and erosion thickness of Western Hubei Eastern Chongqing area，we could conjecture that north of Shizhu composite anticline and west of Fangdou Mountain composites syncline are favorable place for exploration.

Key words： rock mechanics Western Hubei-Eastern Chongqing region shale cap rock erosion thickness triaxial unloading

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	Articles by authors
	HUO Liang1
	YANG Chunhe1
	2
	MAO Haijun2
	LIU Junxin3
	YUAN Yusong4

Cite this article:

HUO Liang1,YANG Chunhe1,2, et al. Experimental research on mechanical properties of western Hubei-Eastern Chongqing carbonaceous shale cap rock under unloading stress path[J]. , 2016, 35(S1): 2898-2906.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0148 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2898

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