软弱破碎围岩变形特性的改进原位承压板试验研究

doi:10.13722/j.cnki.jrme.2022.0456

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Abstract It is an effective method for soft and fractured rock mass to obtain the deformation parameters of surrounding rock by in-situ conventional bearing plate tests. However，it is be restricted by the site condition and the results is significantly size effective due to the structural surrounding rock mass. Relying on the diversion tunnel of a hydropower station in Liangshan Prefecture，conventional bearing plate test was modified，which can be performed with multisize bearing plates flexibly and efficiently during construction of tunnel，to reasonably determine the deformation characteristics and parameters of lamellar and fractured slate. The results show that：(1) the dark black and extremely thin carbonaceous slate was poor integrity，the stability of surrounding rock was very poor in addition with groundwater softening；due to the compaction of stratification plane，weakly water softening and relatively strong block，the gray sandy slate was better stability. (2) the rock mass was significantly anisotropic on account of the extremely fractured macro-meso structural plane，which also resulted in the significantly size effective of tested deformation parameters by conventional bearing plate tests. The secant and envelope modulus， and ，decreased with the increasing of diameter of bearing plate D. (3) in order to diminish the size effect of bearing plate，it is suggested to perform tests with multi-sized bearing plates on the same position for the modified in-situ small tonnage and efficient bearing plate test. Then exponential function can be used to fit the measured deformation modulus and further determined the more reasonable deformation parameters of surrounding rock mass. Based on it，the proposed deformation modulus of carbonaceous slate and sandy slate of the diversion tunnel were = 42.9 MPa， = 60.8 MPa and = 238.3 MPa， = 691.3 MPa，respectively. This study provides an efficient method for weak and fractured surrounding rock mass to rapidly determine the deformation parameters， and provides a reference for the similar excavating tunnel in the future.

Key words： rock mechanics deformation characteristics size effect bearing plate test soft broken rock mass

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	Articles by authors
	ZHONG Zhibin1
	YANG Baowen1
	WEI Xingcan2
	QI Shaoli3
	ZHANG Jin4
	DENG Ronggui4
	LI Tianbin1

Cite this article:

ZHONG Zhibin1,YANG Baowen1,WEI Xingcan2, et al. Experimental study on the deformation characteristics of soft broken surrounding rock mass under modified in-situ bearing plate test#br#[J]. , 2023, 42(S1): 3425-3436.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0456 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3425

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