基于渗流–侵蚀理论的岩溶充填介质注浆加固效果评价

doi:10.13722/j.cnki.jrme.2019.1112

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Abstract The instability of karst filling medium induced by seepage-erosion process often causes serious water-mud inrush disasters，and the scientific evaluation of its grouting reinforcement effect of karst filling medium is an important prerequisite for ensuring the safety of underground construction. In this paper，seepage-erosion tests before and after grouting were conducted via a self-developed large-scale triaxial seepage-grouting multi-functional test platform，focusing on the key factors of grouting reinforcement effect including the initial porosity of the medium and grouting pressure.，and the changes of the medium porosity and the water outflow rate during the seepage process were monitored. The decline of the permeability coefficient，the evolution characteristics of each seepage stage and the delay amplitude of the critical point for flow transition were quantitatively analyzed，and then the reinforcement effect for the filling medium under specific existence conditions and particular grouting parameters were evaluated. The test results show that grouting improves the seepage resistance stability of the filling medium and delays the rapid evolution of porosity as well as the occurrence of the "water inrush" stage，which systematically confirms the rationality of the "three-stage" seepage theory. The regression equations of the delay time of transition points I，II with the grouting pressure and the initial porosity of the samples not only quantitatively describe the influence of grouting on each seepage stage，but also provide a new evaluation perspective for the grouting reinforcement of the filling medium in karst cavities.

Key words： tunnelling engineering karst tunnel water and mud inrush filling mediums seepage-erosion theory grouting reinforcement

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	Articles by authors
	LIU Qi1
	2
	CHEN Weizhong1
	3
	YUAN Jingqiang1
	WANG Yaxiong4
	WAN Hao4

Cite this article:

LIU Qi1,2,CHEN Weizhong1, et al. Evaluation of grouting reinforcement effect for karst filling medium based on seepage-erosion theory[J]. , 2020, 39(3): 572-580.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1112 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I3/572

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