冻融循环作用下注浆裂隙岩体微观孔隙演化规律及剪切力学行为研究

doi:10.13722/j.cnki.jrme.2021.0568

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Abstract In order to study the microscopic pore evolution law and shear mechanical response of grouting fractured rock mass under the action of freeze-thaw cycle，three kinds of grouting reinforcement body samples including ordinary cement(P-type)，superfine cement(C-type) and epoxy resin(H-type) are selected for freezing cycles，nuclear magnetic resonance(NMR) and shear tests. On this basis，the apparent characteristics，microscopic pore structure and shear mechanical properties of the slurry-rock interface layer during the freeze-thaw cycle are analyzed，and the failure mechanisms of macroscopic and microscopic multi-scale grouting consolidation are studied. The results show that：(1) With increasing the number of freeze-thaw cycles，the three types of samples have different degrees of particle spalling，shedding and cracking. The freeze-thaw deterioration of the P-type slurry-rock interface layer is most serious，followed by C-type and H-type. (2) The evolution trends of NMR T2 spectra at the slurry-rock interface layer of the three types of samples are similar and show a right-shift trend with increasing the number of freeze-thaw cycles. The initial pore size is P-type＞C-type＞H-type. In the process of freeze-thaw cycles，the pore size is characterized by the evolution from micropore to mesopore and from mesopore to macropore. (3) The freezing-thawing deterioration of the slurry-rock interface layer is caused by the solid-liquid phase transformation and migration of the internal water under the action of cyclic temperature，and the different grouting materials have a great influence on the freezing-thawing deterioration of the slurry-rock interface layer. (4) The overall shear stress-strain curves of the three types of specimens are similar，and the shear strength(τp) and shear stiffness(KS) of three types of specimens decrease with increasing the number of freeze-thaw cycles. However，τp and KS of H-type specimens are the largest，followed by C-type and P-type. (5) There is a functional relationship between the T2 spectral area and the shear strength of the grouting consolidation body. Based on this，the shear failure mechanism of the slurry-rock interface layer based on the microscopic pore evolution law under different freeze-thaw cycles is obtained. Under the action of the shear stress，the internal pores of the slurry-rock interface layer crack at the tip and connect with the adjacent pores to form a micro-fracture surface. The micro-fracture surface extends along the slurry-rock interface layer to form macroscopic cracks，which eventually leads to the shear failure of the grouting consolidation body along the slurry-rock interface layer. The research results provide a theoretical basis for evaluating the grouting effect of fractured rock mass in seasonal frozen zones and improving the engineering stability of rock mass.

Key words： rock mechanics freeze-thaw cycle grouting reinforcement body slurry-rock interface layer nuclear magnetic resonance

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	ZHANG Jiafan1
	XU Rongping1
	LIU Yang1
	2
	ZHANG Huimei1

Cite this article:

ZHANG Jiafan1,XU Rongping1,LIU Yang1, et al. Study on micro-pore evolution law and shear mechanical behavior of grouting fractured rock mass under freeze-thaw cycle[J]. , 2022, 41(4): 676-690.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0568 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I4/676

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