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断层破碎带、地下水是掌子面稳定性分析中不可忽略的因素,研究断层及地下水影响下掌子面稳定具有重要的工程指导意义。在筒仓理论的基础上,建立隧道掌子面破坏模型,提出了考虑地下水渗透力、断层影响下掌子面稳定的解析方法,并结合实际模型推导了水下隧道断层破碎带掌子面的安全系数的计算公式,以及基于破坏模型的支护力计算方法,为该类隧道的设计和支护提供理论依据。通过算例分析,获得富水地层断层破碎带隧道掌子面安全系数;探讨不同支护理论下的支护力取值。结果表明:位于高水位的水下隧道,地下水渗透力占据支护反力数值的相当大部分,断层对掌子面稳定性具有显著的不利影响,且通过对比分析认为我国传统的支护理论普遍偏于保守,且取值范围较大,不利于工程设计。研究成果将为现场掌子面稳定性预测及支护措施的实施提供依据。
The fault fracture zone and groundwater are the non-negligible factors in the stability analysis of the fossil surface. It is of great engineering significance to study the stability of the fissure surface under the influence of faults and groundwater. Based on the theory of silos, the failure model of tunnel face is established, and the analytical method of considering groundwater penetration and the stability of face under the influence of faults is proposed. Based on the actual model, the fracture surface of underwater tunnel is deduced The calculation formula of safety factor and the calculation method of support force based on failure model to provide the theoretical basis for the design and support of this type of tunnel. Through the example analysis, the safety coefficient of the face of the tunnel in the water-rich stratigraphic fault zone is obtained; and the support force under different support theories is discussed. The results show that the infiltration force of groundwater occupies a considerable part of the supporting reaction force in the underwater tunnel with high water level, and the fault has a significant adverse effect on the stability of the face. The comparative analysis shows that the traditional support theory in our country is universal Partial conservative, and the larger the value, is not conducive to engineering design. The research results will provide the basis for the prediction of the stability of the face and the support measures.