基于剪切和张拉试验的水泥砂浆–黏土岩二元体界面影响区模型

doi:10.13722/j.cnki.jrme.2022.0444

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Abstract Spraying cement mortar is often used in the construction of supporting structures in clay rock tunnels. The debonding of the interface may induce serious geology hazards. Taking the cement mortar-clay rock(C-C) binary as the research object，the shear and tension tests of the interface are carried out. Meanwhile，the influence of the initial moisture content of clay rock on the cohesive strength of the binary is analyzed. According to the macroscopic failure mode and microscopic pore characteristics of the binary，a method to determine the thickness of the interfacial influence zone is given. A new numerical model of C-C binary is proposed，which can simulate the effect of the interfacial influence zone. Finally，the debonding process of eccentric compression binary was taken by the new numerical method. The results show that：(1) In shear or tension tests，the failure face of the mortar-clay rock binary is located in clay rock near the interface，which is a weak zone of the binary，namely the interfacial influence zone(IIZ). (2) The shear stiffness Ks and residual friction coefficient k are independent of normal stress and decrease with the increase of water content of clay rock. (3) The infiltration and solidification of cement slurry will cause the swelling and shrink of clay rocks near the interface，which will produce a large number of initial micro-cracks in the interfacial influence zone. Based on the special pore characteristics of the interfacial influence zone，the thickness of the zone can be identified and measured by computer tomography(CT) and digital image processing technology. (4) The new interface cohesive model considers the bonding effect in the normal and tangential direction and the friction of the interface at the same time，which can simulate the stress-displacement relationship of binary accurately. (5) When the interface stays in an eccentric compression state，the debonding load decreases with the increase of the angle between the load and the interface normal. Therefore，the support structure of the eccentric compression tunnel is more prone to debonding.

Key words： rock mechanics mortar-clay rock binary interfacial influence zone(IIZ) computer tomography(CT) cohesive model water content

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	Articles by authors
	CHENG Shufan1
	ZENG Yawu1
	GAO Rui1
	ZHANG Huimei2
	CHEN Shiguan3

Cite this article:

CHENG Shufan1,ZENG Yawu1,GAO Rui1, et al. An interface influence zone(IIZ) model of cement mortar-clay rock binary#br# based on shear and tension tests[J]. , 2023, 42(4): 964-975.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0444 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I4/964

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