泥岩中软弱夹层的剪切力学特性研究

doi:10.13722/j.cnki.jrme.2020.0725

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Abstract Weak intercalation has great influence on slope and surrounding rock stability. The study on shear mechanical properties and failure modes of weak intercalation has practical engineering significance. In this study，mudstone with weak intercalation in Tianshui，Gansu province was studied. Based on triaxial undrained shear test and numerical analysis，shear mechanical properties of remodeling weak intercalated layer samples with different dip angles were investigated. The stress-strain relationship of the weak intercalation was analyzed，and the shear failure characteristics were discussed. The results show that the experimental and theoretical analysis results are basically consistent with the numerical results and that the shear failure occurs inside the weak layer. With increasing the thickness and the dip angle of the weak layer，the shear strength of the sample decreases gradually in the range of 0°–60° of the dip angle. The weak layer with a low dip angle shows crushed and inflated failure while occurs shear slip along the weak layer as the dip angle is greater than 15°. When the weak layer is thin，the sample is sheared along the structural plane. While the weak layer is thick，extrusion occurs inside the weak layer，or shear slip occurs on the contact surface of the weak layer. What is inconsistent is that，when the dip angle of the weak layer is 0°–15°，the experimental and theoretical analysis results indicate that failure occurs by cutting through the weak layer，while the numerical study shows that there is no obvious shear failure in the weak layer and the failure reflects extrusion and swelling within the weak layer.

Key words： soil mechanics undrained triaxial test numerical simulation dip angle of weak intercalated layer shear surface

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	Articles by authors
	ZHANG Zelin1
	WANG Tao2
	WU Shuren2
	PENG Hongtao1

Cite this article:

ZHANG Zelin1,WANG Tao2,WU Shuren2, et al. Study on shear mechanical properties of mudstone with weak intercalation[J]. , 2021, 40(4): 713-724.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0725 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I4/713

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