易碎岩层原位剪切强度参数获取方法研究

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Abstract Research purposes:In engineering practice, fragile rock layers that cannot be cored, such as fully / strongly weathered rock mass, broken rock mass strongly affected by structure and soft rock, are often encountered, so it is difficult to measure the strength parameters of rock layers. It is urgent to develop in-situ testing methods suitable for the mechanical parameters of such fragile and difficult to obtain cored rock layers.
Research conclusions:(1) The key points of rock and soil drilling in-situ shear technology are combed. According to the pressure range and application scenario of rock and soil in-situ shear technology and equipment, the methods and steps to obtain the strength parameters of fragile strata are put forward. (2) According to the soft and hard degree of rock, weathering degree and rock fragmentation degree, the strength parameters of fragile rock stratum under different conditions are given according to the principle of low, and the applicable drilling in-situ shear technology and equipment selection suggestions are given. (3) It is applied in typical fragile rock strata such as strongly weathered granite, dolomite with joint fissure development and granite seriously affected by structure. The rock mass parameters obtained are in line with the empirical value or the range recommended by the code. (4) The research results can provide reference for the acquisition of in-situ parameters of other fragile strata.

Key words： borehole shear in-situ test strong weathering fragile rock mass strength parameters

Received: 11 July 2022

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TU45

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	Articles by authors
	JIA Zheqiang
	WANG Dong
	REN Li
	ZHANG Guangze
	LI Jiayu
	YUAN Dong

Cite this article:

JIA Zheqiang,WANG Dong,REN Li, et al. Research on the Method of Obtaining In-situ Shear Strength Parameters of Fragile Rock Stratum[J]. Journal of Railway Engineering Society, 2022, 39(10): 19-23.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I10/19

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