地震荷载作用下水泥土搅拌桩复合地基的动力反应分析
首发时间:2009-03-31
摘要:选择广东省某高速公路水泥土搅拌桩加固软基标段作为工程实例,利用动力问题的有限单元法,对原天然地基和水泥土搅拌桩复合地基在地震荷载作用下的动力反应特性主要指标峰值位移进行对比分析,初步探讨了水泥土搅拌桩复合地基的地震响应规律和抗震性能。结果表明:较之原天然地基,水泥土搅拌桩复合地基的竖向地震反应和桩体中部以下的水平向地震反应减弱,而桩体中部位置以上的水平向地震反应增强。
关键词: 地震 有限元 天然地基 水泥土搅拌桩复合地基 峰值位移
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Dynamical response analysis on deep mixing soil-cement pile composite foundation under the seismic load
Abstract:A freeway engineering contract segment in Guangdong Province is chosen as a case study, which adopts the deep mixing soil-cement pile to reinforce the soft ground. Finite element method to solve the geotechnical dynamical problems is employed. Main dynamical response characteristic index, maximum displacement is compared between the original natural foundation and the deep mixing soil-cement pile composite foundation under the seismic load. Earthquake response regularity and earthquake-resistance capability of the deep mixing soil-cement pile composite foundation are discussed initiatively. Conclusions are made as follows: Compared with the original natural foundation, vertical earthquake response and horizontal earthquake response in the upper pile are decreased while the horizontal earthquake response in the lower pile is increased.
Keywords: earthquake finite element method the original natural foundation the deep mixing soil-cement pile composite foundation maximum displacement
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No.3091545412212384****
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