Abstract
After the excavation of underground tunnels, the surrounding rock mass is affected by geostress adjustment and underground water pressure. To better reveal the shear failure process and strength characteristics of a rock mass containing discontinuous joints under the influence of water pressure, we carried out direct shear tests based on a self-developed visualized shear box. Through real-time monitoring of the test process, the influence of water pressure on rock bridge failure was revealed in detail. The test results showed that the failure modes of rock bridges are divided into three types: tensile failure mode, tensile–shear composite failure mode, and shear failure mode. Moreover, water pressure promotes the generation of tensile fractures and accelerates the connection of discontinuous joints. Water pressure in the joint reduces the resistance, the initial strength, and the peak strength of a rock bridge. Finally, the fluid lag phenomenon was achieved in an experiment. Compared with tensile fractures, shear fractures are more prone to fluid lag. Because the joint tip effect is enhanced by water pressure, Lajtai’s rock bridge failure theory was revised to obtain a new shear strength model in which water pressure is considered. The results calculated using the model were in good agreement with the test results. The findings of this study will make us realize the influence of water pressure on rock bridge failure, and provide a certain reference for the prevention and control of water seepage and water inrush disaster in underground engineering.
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The research reported in this manuscript was financially supported by the National Natural Science Foundation of China (Grant No. 51704183) and the Postdoctoral Science Foundation of China (Grant No. 2018M640646).
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Yang, X., Li, L., Sun, P. et al. Laboratory investigation of the shear failure process and strength characteristics of a rock mass containing discontinuous joints under water pressure influence. Bull Eng Geol Environ 81, 95 (2022). https://doi.org/10.1007/s10064-021-02565-z
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DOI: https://doi.org/10.1007/s10064-021-02565-z