宽河谷非均匀工程场地非线性地震反应空间变异特征研究  

Spatial variability characteristics of nonlinear seismic response in non-uniform engineering sites in the wide river valley

作　　者：卢林彤 李孝雄 庄海洋[1,2] 吴琪 LU Lintong;LI Xiaoxiong;ZHUANG Haiyang;WU Qi(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《地震工程与工程振动》2023年第4期216-225,共10页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局地震工程与工程振动重点实验室重点专项(2020EEEVL0301);国家自然科学基金面上项目(51978333)。

摘　　要：针对宽河谷非均匀工程场地地震动响应的空间差异性,以长江下游宽河谷场地为研究对象,建立了宽河谷非均匀场地非线性地震响应的静、动力耦合有限元分析模型,考虑了行波效应和上覆水压力的影响,分析了场地地表及地层不同深度处地震反应空间变异特征。结果表明:场地地表不同位置处地震动参数差异明显,其变化规律与地形起伏相一致,且在多级边坡坡顶、地形起伏较大处地震动参数产生突变,揭示了宽河谷非均匀场地地震动响应空间的差异性;场地地表的反应谱表现出“多峰”、“宽周期”等特性。将计算结果与不考虑地形的简化模型计算结果进行对比分析,验证了非均匀宽河谷场地需要充分考虑地形和土层非均匀的必要性。In view of the spatial difference of the seismic response of the wide valley non-uniform engineering site,the static and dynamic coupled finite element analysis model for nonlinear seismic response of a non-uniform site in the lower reaches of the Yangtze River was developed.The effects of traveling wave effect and overlying water pressure were considered,and the spatial variation characteristics of seismic response at different depths of the site surface and strata were analyzed.The results show that there are obvious differences in the ground vibration parameters at different locations on the surface of the site,and the pattern of change is consistent with the topographic relief,and there are sudden changes in the ground vibration parameters at the top of multi-level slopes and at the place of large topographic relief,which reveal the spatial variability of the ground vibration response of the inhomogeneous site in a wide river valley;The response spectrum of the site surface shows the characteristics of“multi peak”and“wide period”.Comparing the calculation results with the calculation results of the simplified model without considering the terrain,it verifies the necessity of fully considering the terrain and soil non-uniformity in the non-uniform wide river valley site.

关 键 词：宽河谷非均匀场地 地形效应 地震动响应 空间差异性 地震破坏 

分 类 号：TU43[建筑科学—岩土工程]