摘要
上海的第四纪沉积土层呈水平层状分布,市区的土层厚度约为270～290m,年平均地下水位0.5～0.7m。上海地区上覆深厚、饱和的沉积土层,对土层的地震反应特性具有重要的影响。基于动力耦合理论,将上海深厚饱和覆盖土层视为由固相和液相组成的两相饱和多孔介质,建立了能够反映上海土层深厚、饱和特点的地震反应计算模型。然后应用该模型,以ElCentro,Taft,苏南和唐山地震波作为基岩输入加速度,对深度280m的上海深厚覆盖土层进行了动力耦合地震反应计算,并对加速度、振动孔隙水压力和地基震陷结果进行了分析。
The Quaternary sedimentary soil in Shanghai is horizontally distributed layers with a depth up to 270-290 m or so in the urban area and with annual groundwater table of 0.5-0.7 m from the surface. Therefore, the sedimentary soil of Shanghai is deep and fully saturated and has important influence on earthquake response of soil layers. Based on the dynamic coupled theory, the saturated soil was modeled as a porous media system with solid and fluid phases. A new numerical model for predicting the seismic response of soil layers was developed to describe the characters of deep saturated soil deposits. Then the seismic response of Shanghai horizontal soil layer having a depth of 280 m, which is subjected to four base excitations (El Centro, Taft, Sunan and Tangshan Earthquakes), was studied in terms of dynamic coupled computation with the proposed model. The calculating results of acceleration, pore water pressure and earthquake subsidence were also investigated.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2002年第4期411-416,共6页
Rock and Soil Mechanics
基金
上海市重点学科(岩土工程)基金资助项目
