| 真空堆载联合预压作用下软土地基位移和孔压变化规律研究 |
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| 引用本文： | 徐乃芳,张云,高倚山,杨绪军. 真空堆载联合预压作用下软土地基位移和孔压变化规律研究[J]. 工程勘察, 2010, 0(7): 1-7,17 |
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| 作者姓名： | 徐乃芳 张云 高倚山 杨绪军 |
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| 作者单位： | 南京大学地球科学与工程学院;华东电力设计院; |
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| 基金项目： | 国家自然科学基金项目资助(40772168) |
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| 摘 要： | 根据实测资料分析了真空堆载联合预压作用下加固区地表沉降、土体侧向位移、孔压、超孔压变化规律,并对孔压消散原因进行微观解释,结果表明:真空预压形成的负压与堆载预压形成的正压二者在加固软土地基的效果上是一致的,场地中心处的沉降要比四周大,用固结度对数配合法推定最终沉降,停泵时的平均固结度达到97%;真空预压阶段土体侧向位移方向是指向加固区内的,而堆载预压阶段是指向加固区外的;开始抽真空后浅层土体孔压消散非常明显,深层土体孔压消散较为缓慢,后期较深土层中孔压才有较大变化;超孔压在抽真空后变为负值,在真空预压阶段绝对值越来越大。
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| 关 键 词： | 真空堆载联合预压 地表沉降 侧向位移 孔隙水压力 超孔隙水压力 消散规律 |
Study on laws of the displacement and the pore water pressure variation in strengthening soft ground by using vacuum-surcharge preloading |
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| Xu Naifang ,Zhang Yun ,Gao Yishan ,Yang Xujun. Study on laws of the displacement and the pore water pressure variation in strengthening soft ground by using vacuum-surcharge preloading[J]. Geotechnical Investigation & Surveying, 2010, 0(7): 1-7,17 |
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| Authors: | Xu Naifang Zhang Yun Gao Yishan Yang Xujun |
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| Affiliation: | Xu Naifang 1,Zhang Yun 1,Gao Yishan 2,Yang Xujun 2(1.School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,China,2.East China Electric Power Design Institute,Shanghai 200331,China) |
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| Abstract: | Based on the observation data from vacuum-surcharge preloading,the variation laws with time such as the ground settlement,the lateral displacement,pore water pressure and excess pore water pres-sure are analyzed,and the microcosmic reasons for the dissipation of soil pore pressure are explained.The results indicate that the effects of the negative pressure produced by vacuum preloading and the positive pressure produced by surcharge preloading are the consistent for the reinforcement of soft ground.The set-... |
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| Keywords: | vacuum-surcharge preloading ground subsidence lateral displacement pore water pres-sure excess pore water pressure dissipation law |
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