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<p>With the widespread construction of urban subways, shields inevitably pass through many complex strata. Karst strata, as a typical representative, have attracted considerable attention. This is because karst strata are highly susceptible to engineering hazards, including shield machine toppling, disc cutter damage, and ground collapse. We used numerical simulation and model testing methods to study the influence of untreated and treated karst caves on the stability of the strata when shield tunneling passes through karst areas, and reproduced the shield tunneling process when the filling strength of the karst cave is 80% of the surrounding rock strength. The results demonstrated that shield excavation after the treatment of the front karst cave effectively reduced the changes in the stress and displacement of the surrounding rock and reduced the settlement of the ground surface and at a buried depth of 3&#xa0;m by 59.7 and 37.8%, respectively. The rate of stress change In the tunnel sidewalls was greater than that at the top and bottom of the tunnel. When the filling strength of the karst cave was 80% of the strength of the surrounding rock, the shield tunneling did not cause excessive ground displacement, thus ensuring the stability of the surrounding rock.</p>

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Stability Assessment of Surrounding Rock during Shield Tunneling through Karst Cavities Using Numerical and Physical Modeling

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Jing Wang,
  • Yang Luo,
  • Zhongdong Fang,
  • Xingzhi Ba,
  • Yijie Zhang,
  • Hao Jiang

摘要

With the widespread construction of urban subways, shields inevitably pass through many complex strata. Karst strata, as a typical representative, have attracted considerable attention. This is because karst strata are highly susceptible to engineering hazards, including shield machine toppling, disc cutter damage, and ground collapse. We used numerical simulation and model testing methods to study the influence of untreated and treated karst caves on the stability of the strata when shield tunneling passes through karst areas, and reproduced the shield tunneling process when the filling strength of the karst cave is 80% of the surrounding rock strength. The results demonstrated that shield excavation after the treatment of the front karst cave effectively reduced the changes in the stress and displacement of the surrounding rock and reduced the settlement of the ground surface and at a buried depth of 3 m by 59.7 and 37.8%, respectively. The rate of stress change In the tunnel sidewalls was greater than that at the top and bottom of the tunnel. When the filling strength of the karst cave was 80% of the strength of the surrounding rock, the shield tunneling did not cause excessive ground displacement, thus ensuring the stability of the surrounding rock.