深埋硬岩隧洞复杂岩性挤压破碎带塌方过程及机制分析——以锦屏地下实验室为例

doi:10.13722/j.cnki.jrme.2017.0110

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Abstract The excavation of deep buried tunnel with the large cross section reveals many kinds of rocks with different physical and mechanical properties. It is very important to study the process and mechanism of the collapse for the complex lithological compressive rupture zone. The complicated lithological compressive rupture is located in No.3 laboratory of Jinping underground laboratory. The collapse happened there once. It was found through the field geological investigation and mineral analysis that the complex lithology of rock mass and high in-situ stress were the key factor of collapse. The failure mode of rock collapse recorded by video，the failure mechanism obtained by scanning electron microscope and the different lithological rock mass located in spatial distribution indicated that there was an obvious progressive failure characteristics in this collapse and the different lithological rock masses exhibited the different failure mechanisms. The variegation breccia and the corrosion marbles in the southern side wall and tunnel face exhibited the shearing slip failure，and the calcite marble in the northern side wall exhibited the toppling failure due to joint opening，and the mosaic cementation marble，variegation breccia marble and corrosion marble in top arch exhibited the gravitational collapse. The process of collapse recorded by video and the failure mechanism of different lithological rock mass obtained by SEM show：the excavation unloading→the collapsing of the thin layer rock mass around the tunnel→the shearing slip of the rock in the southern wall→the toppling failure of rock in the northern wall due to joint opening→the rebounding of the top arch rock under the unloading of both sidewalls→the gravitational collapsing. The comprehensive treatment measures inside and outside of surrounding rock(initial shotcrete not less than 10 cm thick + grouting bolt with anchor plate + suspended net + shotcrete again) were recommended.

Key words： tunnelling engineering deep buried tunnel complex lithology collapse failure mechanism

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	Articles by authors
	HUANG Jingzhu1
	FENG Xiating1
	2
	ZHOU Yangyi1
	JIANG Quan2
	YANG Chengxiang1

Cite this article:

HUANG Jingzhu1,FENG Xiating1,2, et al. Analysis of collapse process and mechanism of complex lithologic compressive rupture zone in deep buried hard rock tunnel：a case study of Jinping underground laboratory[J]. , 2017, 36(8): 1867-1879.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0110 OR http://www.rockmech.org/EN/Y2017/V36/I8/1867

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