基于沉积特征的层状盐岩界面抗剪强度特性研究

doi:10.13722/j.cnki.jrme.2014.s2.030

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Abstract The interfaces in bedded salt formations have a critical influence on the stability and tightness of underground gas/oil storages. Relying on the geological and test data of Yunying salt mine in Hubei province，the shear strength properties of the interfaces were firstly analyzed，and then two strength models for dominant interfaces were revealed，finally the failure mechanism was discussed. Results show that：(1) Most of the interfaces of bedded salt formations formed by chemical deposition are strong，such as interface between rock salt and argillaceous anhydrite. The strengths of mechanical deposition interfaces are lower，specifically interfaces between mudstone and rock salt. Weak interfaces normally appear at the sudden transition interfaces. (2) Two shear strength models were proposed respectively for the graduate transition interfaces and discrete discontinuous interfaces. Especially gradual transition interfaces are similar to functionally graded materials(FGM) while sudden transition interfaces can be treated as the contact surface between rock salt and interlayer. (3) Gradual transition interfaces could transfer the additional force resulted from the inconsistent deformation between salt rock and interlayer，thus not prone to breakage. However，the sudden transition interfaces cannot. The analysis reveals the relationship between sedimentary characteristics and shear strength of bedded salt formations，which provides important references for the design and construction of underground gas storage in bedded salt formations.

Key words： rock mechanics bedded salt formations sedimentary characteristics gradual transition interfaces sudden transition interfaces shear strength

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	Articles by authors
	ZHANG Guimin1
	LI Yinping2
	LIU Wei2
	ZHANG Guanghui1

Cite this article:

ZHANG Guimin1,LI Yinping2,LIU Wei2, et al. STUDY OF SHEAR STRENGTH PROPERTIES OF INTERFACES IN BEDDED SALT FORMATIONS BASED ON SEDIMENTARY CHARACTERISTICS[J]. , 2014, 33(S2): 3631-3638.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.030 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/3631

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