Abstract
When shield tunnel passes through karst strata, the existence and development of karst caves will inevitably affect the safety of tunnel construction. Therefore, the karst caves in the construction area must be filled, and the backfill strength of karst caves will also affect the stability of surrounding rock. In this paper, the discrete element model of karst stratum is constructed by calibrating the discrete element EDEM mesoscopic parameters. The simulation of shield tunneling process under different karst cave filling intensities is realized. The influence of the ratio of cave filling strength to surrounding rock strength on the stability of surrounding rock is studied. The results show that: (1) Critical normal stress and normal contact stiffness only affect the peak stress, while critical tangential stress and tangential contact stiffness both affect elastic modulus and peak stress. (2) When the ratio of the filling strength of the cave in front of the shield to the strength of the surrounding rock is controlled between 0.8 and 1.2, the stability of the surrounding rock is less affected by the cave. (3) By comparing with the test results, when the ratio of the strength of cave filling material to the strength of surrounding rock is 0.8, the shield machine can safely pass through the front cave without excessive formation deformation. This study provides a basis for the treatment of karst caves when shield tunneling through karst areas.
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Funding
This work was supported by the National Natural Science Foundation of China (No. 51879148, 51809158), Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) (No. 2019JZZY010428), Transportation Science and technology plan of Shandong Province in 2019 (No. 2019B47_1).
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Conceptualization, ZF and JW; methodology, ND; software, RD; validation, XB, JH and ZZ; formal analysis, ZF; resources, WY and ND; writing—original draft preparation, ZF; writing—review and editing, ZF and WY; supervision, ZD. All authors have read and agreed to the published version of the manuscript.
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Fang, Z., Ding, N., Yang, W. et al. The Influence of Different Karst Cave Filling Material Strengths on Stratum Stability During Shield Tunneling. Geotech Geol Eng 41, 1309–1323 (2023). https://doi.org/10.1007/s10706-022-02337-w
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DOI: https://doi.org/10.1007/s10706-022-02337-w