基于岩体波速的地下洞室围岩损伤区岩体力学参数取值方法及工程应用

doi:10.13722/j.cnki.jrme.2024.0117

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Abstract A damage zone that has a certain depth and is circularly distributed along the cavern boundary usually forms within the surrounding rocks of caverns in the excavation blasting and later utilization(for instance，compressed air energy storage) processes. Therefore，exploring a method for determining mechanical parametric values of rock masses inside the damage zone of the cavern surrounding rock is of significance to stability analysis and support design of surrounding rock in underground caverns. Considering the seismic wave velocity and acoustic velocity of rock masses，a formula for calculating the geological strength index GSI and rock mass disturbance factor D of rock mass in the damage zone of surrounding rocks of underground caverns was established. Changes in the disturbance factor D with the depth of damage zone in the surrounding rocks of underground caverns were quantitatively determined. Additionally，the Hoek-Brown strength criterion was introduced to study the determination method of mechanical parameter values of rock mass in the damage zone. The results show that the proposed calculation methods of GSI and D well reflect the change with the depth in the mechanical parameters of rock mass in the damage zone of caverns in the excavation blasting and later utilization (compressed air energy storage for instance) processes. The uniaxial compressive strength of rock mass in the damage zone is most seriously weakened while the internal friction angle is least weakened. The wave velocities of surrounding rock mass of the cavern can be classified into three types：(1) concave-shaped slow increase area and stably fluctuating area；(2) convex-shaped slow increase area and stably fluctuating area；(3) linearly slow increase area and stably fluctuating area. When numerical simulation methods and constitutive relationship are allowed，the depth interval of the damage zone should be selected for modeling according to the degree of importance for engineering projects in the evaluation of the stability of surrounding rock in the damage zone of underground caverns. The rock mass disturbance factor D should be determined based on the tested average wave velocities of rock mass in sub-zones. The results provide reference for evaluating the stability of the surrounding rock mass in the damage zone in similar underground caverns and for determining mechanical parameter values of rock mass in support design.

Key words： rock mechanics underground caverns damage zone of surrounding rock mass mechanical parameters of rock mass Hoek-Brown criterion wave velocity of rock mass geological strength index rock mass disturbance parameters

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	Articles by authors
	XIA Kaizong1
	2
	LIU Xialin3
	LIN Yingshu4
	ZHANG Fei5
	SI Zhiwei1
	2
	SUN Chaoyi1
	2

Cite this article:

XIA Kaizong1,2,LIU Xialin3, et al. A method for determining mechanical parameter values of rock mass in the damage zone of surrounding rocks of underground caverns based on wave velocities of rock mass and its engineering application[J]. , 2024, 43(10): 2414-2429.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0117 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2414

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