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高速公路下伏多层采空区路桥变形及受力响应特征研究 被引量:4

Study of deformation and stress characteristics of highway subgrde and bridge fundation above mined-out regions
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摘要 高速公路下伏采空区地表变形计算及处治范围确定,是目前高速公路建设中急待解决的技术难题,尤其在缺乏观测资料地区,目前的经验及理论公式都难以解决。以垄茶高速采空区为背景,基于ansys有限元程序构建FLAC3D计算模型,分别对开采前、开采后未注浆和经注浆处理的多层采空区进行数值模拟对比,分析了路基、桩基变形响应和应力响应特征,确定了地表变形警戒边界和注浆处理范围,这对注浆处理和路面及桥梁设计具有重要的理论指导意义和工程实践价值。 It is of challenge and emergent problems for calculating surface deformation and deterninating treatment scope for the mined-out regions under the highway.Especially when there is no monitor data,the empirical and theory formula can't solve this problem.Based on the finite element software the FLAC3D calculation model is constructed,the initial model、ungrouted excavated model and grouted excavated model for multi-layer mined-out tunnel are calculated.The deformation and stress characteristics of subgrade and pile foundation are analyzed and the warning border of the surface deformation and grouting scope are determined.The above-mentioned results have important theoretical meaning for guiding the practice of grouting mined-out regions and the design of pavement and bridge.
作者 任沙
出处 《公路工程》 2011年第1期59-65,79,共8页 Highway Engineering
关键词 采空区 变形 应力响应 FLAC3D 注浆 mined-out area deformation stress characteristics FLAC3D grout
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