| 含水率对于地下结构地震动力响应的影响研究 |
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| 引用本文： | 孙健,戚承志,刘旭,陈国兴. 含水率对于地下结构地震动力响应的影响研究[J]. 北京建筑工程学院学报, 2014, 0(3): 35-39 |
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| 作者姓名： | 孙健 戚承志 刘旭 陈国兴 |
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| 作者单位： | 北京建筑大学 土木与交通工程学院 工程结构与新材料北京市高校工程研究中心,北京,100044;南京工业大学 岩土工程研究所,南京,210009 |
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| 基金项目： | 国家自然科学基金资助项目，北京市属高等学校创新团队建设与教师职业发展计划项目，国家重点基础研究发展计划(973)项目 |
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| 摘 要： | 含水率对土体的弹性模量、黏聚力、内摩擦角以及土体密度都会产生影响.密实度一定的情况下,黏性土的多种力学参数会随着最佳含水率的出现而出现"峰值"效应.利用FLAC3D差分软件对不饱和土在地震作用下的动力响应进行了模拟和分析,探讨了土中含水率对于地下结构地震动力响应的影响规律.结果表明,在最佳含水率附近,土层的性质对于地下结构的作用来说是最良好的,此时结构的内力可取得最小值;顶板和底板的相对水平位移变化不大,并且位移的数值随着含水率的增加而逐渐减小;土体和结构的加速度峰值都随着含水率的增加而呈减小的趋势.
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| 关 键 词： | 含水率 加速度 Mises 应力 平面应力 |
Effect of Moisture Content on Dynamic Seismic Responses of Underground Structure |
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| Sun Jian,Qi Chengzhi,Liu Xu,Chen Guoxing. Effect of Moisture Content on Dynamic Seismic Responses of Underground Structure[J]. Journal of Beijing Institute of Civil Engineering and Architecture, 2014, 0(3): 35-39 |
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| Authors: | Sun Jian Qi Chengzhi Liu Xu Chen Guoxing |
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| Affiliation: | Sun Jian , Qi Chengzhi , Liu Xu , Chen Guoxing(1. School of Civil and Traffic Engineering, Beijing Higher Education Research Center of Engineering Structures and New Materials, Beijing University of Civil Engineering and Architecture, Beijing 100044 ; 2. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009) |
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| Abstract: | Moisture content of soil has definite effects on elasticity modulus, cohesion, internal friction angle and density of soil. Given compactness of soil, several mechanical parameters of soil will have ＂peak value＂ effect at the optimum moisture content. In this paper simulation and analysis on dynamic responses of unsaturated soil under seismic excitations are carried out by using Flac3D finite difference software, and the effect of moisture content on dynamic responses of underground structure under seismic excitations is investigated. Analysis results show that properties of soil at the optimum water content are optimal for the seismic responses of underground structures, because in this case the internal forces achieve the minimum values; the relative horizontal displacement of top and bottom slabs has not significant change, and the values of displacement are gradually decreasing with the increase of water content; and so does the maximum accelerations of soil and structure with the increase of water content. |
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| Keywords: | moisture acceleration Mises stress biaxial stress |
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