深埋大理岩强度参数变化规律的综合试验研究

doi:10.13722/j.cnki.jrme.2015.1550

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Abstract The study on the strength parameters of deep rock mass is complicated and difficult. The strength parameters have close relationships with the sample sizes，stress states and loading paths. A series of triaxial tests are carried out to study the strength parameters and their variations characteristics of T2b marbles from the deeply located intake tunnel of Jinping II Hydropower Station，including the loading and unloading triaxial tests of different size samples in laboratory and in situ with low-middle，middle-high and high-very high confining stresses. Following results can be noted. Firstly，test results of ten sets of different kinds of mentioned triaxial tests on the strength parameters are listed in the paper as to show the effects of confining stress magnitude，stress loading and unloading path，and sample size on strength characteristics. Secondly，the variation characteristics of the strength parameters of T2b marbles show a consistent variation tendency when the confining stress magnitude changed：the value of decreases and the value of c increases with increase of confining stress magnitude，but the ranges of variation of the and c values are not in consistency with different loading paths and different sample sizes. Thirdly，compared to loading condition，the unloading path will lead to a higher value of the strength parameter and a lower value of parameter c. At last，The size effect of the strength parameter of the marbles in the scale from 50 mm×100 mm to 500 mm×500 mm×1 000 mm is not obvious，but the size effect of the strength parameter c is significant.

Key words： rock mechanics Jinping II hydropower plant deep marbles stress level stress path size effect strength parameters

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	Articles by authors
	WU Aiqing1
	WANG Jimin2
	SHAN Zhigang3
	FAN Lei1
	ZHOU Huoming1
	ZHOU Chunhong3
	LI Weishu1
	WANG Bin1

Cite this article:

WU Aiqing1,WANG Jimin2,SHAN Zhigang3, et al. Experimental study of strength parameters and their variation characteristics of deep marbles[J]. , 2016, 35(9): 1740-1746.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1550 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/I9/1740

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