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为了明确多年冻土地区公路隧道承受的围岩荷载,给其结构设计提供科学依据,针对冻胀荷载的计算方法以及围岩荷载的组合形式进行了研究。考虑围岩不均匀冻胀特性,推导了不均匀冻胀时圆形隧道冻胀荷载的解析解;建立了冻胀荷载的有限元数值分析方法,揭示了围岩性质、埋深、衬砌形状对冻胀荷载的影响规律;对冻胀荷载包络图进行简化并分解,拟合了适用于曲墙式衬砌的冻胀荷载简化计算公式,并给出了荷载分布特征参数和量值特征参数;总结了多年冻土区公路隧道荷载组合形式。结果表明:冻胀荷载实测值为0.8,1.03MPa时,提出的冻胀荷载解析公式的计算值为0.62,1.12 MPa,与实测值吻合较好;以有限元数值方法计算结果为参照,冻胀荷载的简化计算方法平均相对误差为5.13%,可满足工程应用的精度要求。
In order to clarify the surrounding rock load sustained by highway tunnels in permafrost regions, provide a scientific basis for its structural design, and research on the calculation method of frost heave load and the combination form of surrounding rock load. Considering the non-uniform frost heave characteristics of surrounding rock, the analytic solution of circular tunnel frost heave load is deduced. The finite element numerical analysis method of frost heave load is established, and the properties of surrounding rock, depth, The influence of frost heave load is simplified. The envelope diagram of frost heave load is simplified and decomposed. The simplified formula of frost heave load applied to curved wall lining is fitted, and the load distribution characteristic parameter and volume characteristic parameter are given. Summed up the permafrost zone road tunnel load combination form. The results show that when the measured value of frost heaving load is 0.8 and 1.03 MPa, the proposed analytical formula of frost heave load is 0.62,1.12 MPa, which is in good agreement with the measured value. The frost heaving The average relative error of simplified calculation method of load is 5.13%, which can meet the precision requirements of engineering application.