基于井下钻孔剪切的煤矿巷道围岩强度演化规律研究

doi:10.13722/j.cnki.jrme.2019.0495

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Abstract The in-situ test is the most direct and accurate method to collect the strength and deformation parameters of engineering rock mass at present，which has a significant reference value to the support design and stability control of underground engineering. In this paper，the testing theory，method，applicability and boundedness of ultrasonic exploring method，borehole penetrating method and borehole shear method for testing the in-situ strength of surrounding rock mass in underground roadways were systematically discussed. Both the ultrasonic exploring method and borehole penetrating method rely on the verification and calibration of empirical formula or laboratory test results to some degree，while the borehole shear method absolutely depends on the in-situ testing. The borehole shear method is also appropriate for the surrounding rock mass containing closed or small opening fractures. Therefore，the obtained in-situ strength parameters by the borehole shear method can be served as a comprehensive index to evaluate the stability of surrounding rock mass in roadways. Based on the in-situ cohesion and internal fraction angle tested from the borehole shear method，the uniaxial compression strength can be obtained according to the linear Coulomb criterion. Finally，based on lots of testing results of Pingdingshan mining area and Datong mining area by the authors? team using the borehole shear method in recent years，some topical cases were analyzed and discussed about the spatial distribution and the effect of excavation time of in-situ strength of surrounding rock mass in roadways，strength distribution feature in the coal-rock interface，and the effect of upper coal pillar on the strength of surrounding rock mass. The research results show that，with an increase in testing depth，the cohesion and uniaxial compression strength of surrounding rock mass of Dinger rail roadway in Pingdingshan #9 coal mine，increase gradually and present the spatial distribution feature of an exponential function. The in-situ strength of engineering rock mass also has the excavation time effect. The cohesion and uniaxial compression strength of surrounding rock mass of Wujiu new special roadway in Pingdingshan #4 coal mine after excavation for three months are obviously smaller than those of fresh excavation roadways. The in-situ strength of sandstone in the roof of 5937 roadway in Xinzhouyao coal mine of Datong mining area is larger than that of the coal seam，and the strength of rock mass in the coal-rock interface is between them. The 5704 roadway of Xinzhouyao coal mine is affected by both the neighboring goaf of this working face and the coal pillar of the upper goaf，resulting in the strength difference between two walls，as well as the strength difference of surrounding rock mass with different positions below the pillar.

Key words： rock mechanics roadway in-situ strength borehole shear ultrasonic exploring borehole penetrating

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	JING Hongwen
	SU Haijian
	SHI Xinshuai
	ZHAO Zhenlong
	MENG Bo

Cite this article:

JING Hongwen,SU Haijian,SHI Xinshuai, et al. Study on the strength evolution rule of surrounding rock mass in roadways#br# based on the in-situ borehole shear method[J]. , 2019, 38(12): 2428-2437.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0495 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I12/2428

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