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| 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 |
| XIA Kaizong1，2，LIU Xialin3，LIN Yingshu4，ZHANG Fei5，SI Zhiwei1，2，SUN Chaoyi1，2 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Zhongjiao Second Highway Survey and Design Institute Co.，Ltd.，Wuhan，Hubei 430056，China；4. China Wuzhou Engineering Group Corporation Ltd.，Beijing 100053，China；5. Yunnan Water Resources and Hydropower Vocational College，Kunming，Yunnan 650499，China)
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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.
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2024, Vol. 43 
