基于能量守恒讨论动荷载的不同等效静力形式，给出地下圆形衬砌动载作用下的拟静力等效简易力学模型，基于自由变形法推导给出瞬间动载的模型内力极值理论解。对比既有地下结构衬砌顶爆及侧爆冲载的试验结果、初步考察建议模型的适用性及参数效应。对比发现，各种爆冲荷载的等效形式中，三角形荷载的等效选型结果对模型试验结果的适应性较好，初步满足解析解与数值模拟值的对比验证。模型参数效应明确，内力极值解方便工程应用。
Abstract
The theoretical formula of pseudo-static equivalent model for impact dynamic load of underground circular lining and its internal force extreme value solution is given based on the conservation of energy in this paper. The equivalent load forms of different impact are discussed.The theoretical solution of the extreme value of the internal force of the model under transient impact load is derived based on the free deformation method. The internal force calculation formula under different equivalent forms of impact loads is obtained and calculation results contrast with results of existing top blasting model test of circular tunnel. Preliminary validation of internal force and parameter efforts for circular lining under the blasting impact at the top of existing underground structure lining is compared with the model test results. It found that the equivalent model of triangular load is the nearest style with the model test in the equivalent form of all kinds of blasting load. The conclusion is that the theoretical results accord with experimental values very well and the equivalent impact loads form of triangular is most realistic in all equivalent forms. The proposed equivalent model of load and the extreme value of internal force formula are easy to be applied in engineering and design.
关键词
地下圆形衬砌 /
动载 /
等效简易模型 /
内力极值解
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Key words
Underground circular lining /
impact dynamic load /
pseudo-static equivalent method /
maximum solution of internal force analysis
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