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Progressive arching effect and damage evolution process of shallow tunnels with jointed hard rock under overlying loads
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-14 , DOI: 10.1016/j.tust.2025.106385
Zhe Qin, Wenlong Liu, Fayu Wu, Weiteng Li
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-14 , DOI: 10.1016/j.tust.2025.106385
Zhe Qin, Wenlong Liu, Fayu Wu, Weiteng Li
The influence of the arching effect on the loosening pressure in shallow tunnels with jointed hard rock is not clear. In order to solve this problem, the analytical model of loosening pressure in shallow tunnels is modified by considering the role of stress deflection and shear resistance under the arching effect of the stratum based on the traditional analytical model of loosening pressure. Relying on the Qingdao Metro Line 6 project, this paper carries out similar model test and numerical simulations, verifies the applicability of the analytical solution, and clarifies the influence of different joint surfaces on the tunnel stability. The results show that: (1) The shallow tunnel stratum arch of jointed hard rock under overlying loads is formed by progressive stepwise evolution. In the limit state, the final arch reduces the surrounding rock pressure acting on the supporting structure, so that the surrounding rock pressure is only 3.8 times of the self-weight of the rock mass in the loosening zone, and the test and numerical results are more in agreement with the analytical solution. (2) In the process of overlying loads, the macro-mechanical properties of the surrounding rock are greatly influenced by the joint surfaces. Preferential cracking of the rock at the arch waist where the joint surfaces are located, with the cracks extending in a figure of eight pattern along the joints. (3) When the joint surfaces tend to be parallel to the direction of the maximum principal stress, the mechanical properties of the rock body are better; with the increase in the number of joint surfaces, the rock body anisotropy is more obvious, and the rock body between the joint surfaces is more fragile and then damage to the detachment. The research results provide a certain reference and guidance for the stability analysis of tunnels with joint surfaces under the timely active support system considering the arching effect.
中文翻译:
上覆荷载作用下节理硬岩浅层隧道的渐进拱效应及损伤演化过程
拱形效应对节理硬岩浅层隧道松动压力的影响尚不清楚。为解决这一问题,在传统松动压力解析模型的基础上,考虑地层拱形作用下应力挠度和抗剪阻力的作用,对浅层隧道松动压力解析模型进行了修改。本文依托青岛地铁 6 号线项目,开展了类似的模型试验和数值模拟,验证了解析解的适用性,明确了不同节理面对隧道稳定性的影响。结果表明:(1)上覆荷载作用下节理硬岩浅隧道地层拱是渐进逐步演化形成的。在极限状态下,最终拱门降低了作用在支护结构上的围岩压力,使围岩压力仅为松动带岩体自重的 3.8 倍,试验和数值结果与解析解更吻合。(2) 在上覆荷载过程中,围岩的宏观力学性能受节理面影响较大。岩石在节理表面所在的拱腰处优先开裂,裂缝沿节理以 8 字形延伸。(3)当节理面趋于平行于最大主应力方向时,岩体力学性能较好;随着节理面数量的增加,岩体各向异性更加明显,节理面之间的岩体更加脆弱进而损伤脱离。 研究结果为考虑拱形效应的及时主动支护系统下节理面隧道的稳定性分析提供了一定的参考和指导。
更新日期:2025-01-14
中文翻译:
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上覆荷载作用下节理硬岩浅层隧道的渐进拱效应及损伤演化过程
拱形效应对节理硬岩浅层隧道松动压力的影响尚不清楚。为解决这一问题,在传统松动压力解析模型的基础上,考虑地层拱形作用下应力挠度和抗剪阻力的作用,对浅层隧道松动压力解析模型进行了修改。本文依托青岛地铁 6 号线项目,开展了类似的模型试验和数值模拟,验证了解析解的适用性,明确了不同节理面对隧道稳定性的影响。结果表明:(1)上覆荷载作用下节理硬岩浅隧道地层拱是渐进逐步演化形成的。在极限状态下,最终拱门降低了作用在支护结构上的围岩压力,使围岩压力仅为松动带岩体自重的 3.8 倍,试验和数值结果与解析解更吻合。(2) 在上覆荷载过程中,围岩的宏观力学性能受节理面影响较大。岩石在节理表面所在的拱腰处优先开裂,裂缝沿节理以 8 字形延伸。(3)当节理面趋于平行于最大主应力方向时,岩体力学性能较好;随着节理面数量的增加,岩体各向异性更加明显,节理面之间的岩体更加脆弱进而损伤脱离。 研究结果为考虑拱形效应的及时主动支护系统下节理面隧道的稳定性分析提供了一定的参考和指导。