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0.8,1.03 MPa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。
Abstract
To clarify the supporting load and provide a scientific basis for structure design of highway tunnels in permafrost regions, the calculation methods for frost heave load and combination type of supporting load were researched. The analytical solution for frost heave load of a circular tunnel under the condition of non-uniform frost heave was derived using the non-uniform frost heave characteristic. The influences of the nature of surrounding rock, buried depth, lining form on the frost heave load were disclosed by the finite element analysis method. The envelope diagram of frost heave load was simplified and disintegrated. Simplified calculation formula of frost heave load on the curved wall lining was fitted. Characteristic parameters of load distribution and values were given. The combination type of supporting load around highway tunnel in permafrost regions was concluded. The results show that when the measured values of frost heave load are 0.8, 1.03 MPa, the calculation values of analytical formula are 0.62, 1.12 MPa, which agree well with the measured values, The average relative error between simplified calculation and the numerical calculation about frost heave load is 5.13%, which can meet the precision requirement of engineering application.
关键词
隧道工程 /
围岩荷载 /
数值分析 /
解析解 /
多年冻土
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Key words
tunnel engineering /
supporting load /
numerical analysis /
analytical solution /
permafrost
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中图分类号：
U451.2
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参考文献
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脚注
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基金
“十二五”国家科技支撑计划项目(2014BAG05B05)
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