| 摘要: |
| 现场孔隙水压力的变化过程能反映地基加固过程中有效应力的发展，现场孔隙水压力的监测是真空预压加固软土地基的重要监测内容之一。通过现场孔隙水压力监测资料,用曼德尔效应解释了真空预压加固吹填淤泥前期出现孔隙水压力增大的现象，分析了真空预压加固吹填淤泥地基出现曼德尔效应的原因，结果表明，在真空预压加固吹填淤泥地基时曼德尔效应的持续时间沿深度逐渐缩短。综合考虑土的固结状态、负压的传递及工程所处环境表明，真空预压加固吹填淤泥时，孔隙水压力的变化受吹填土的欠固结程度、负压的传递和膜上覆水压力等因素综合影响。 |
| 关键词: 真空预压 吹填淤泥 孔隙水压力 曼德尔效应 欠固结土 |
| DOI： |
| 分类号:TU472 |
| 基金项目:国家自然科学基金资助项目（51379131）；交通运输部科技成果推广项目（2015326T18050） |
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| Discussion on characteristics of pore pressure in hydraulic reclamation silt foundation under vacuum preloading |
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XU Binhua1,2, HE Ning1, ZHOU Yanzhang1, JIANG Yanbin1, ZHU Qunfeng1
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1.Nanjing Hydraulic Research Institute, Nanjing;2.Hohai University, Nanjing
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| Abstract: |
| The pore water pressure monitoring is one of the important contents of the monitoring hydraulic reclamation silt foundation under the vacuum preloading, and the variation of the pore water pressure can reflect the development of effective stress in the process of foundation reinforcement. Based on the pore water pressure monitoring data, the authors explain the increasing of the pore water pressure in the early stage of the vacuum preloading with the Mandel-Cryer effect, analyze the reasons why the Mandel-Cryer effect happens in the hydraulic reclamation silt under the vacuum preloading, and obtain the duration of the Mandel-Cryer effect that reduces along the depth when the hydraulic reclamation silt is under the conditions of the vacuum preloading. At the same time, considering the soil consolidation state, the transfer of the negative pressure and the engineering environment, the analysis results indicate that the variation of the pore water pressure in the hydraulic reclamation silt foundation under the vacuum preloading is influenced by soil consolidation state, transfer of the negative pressure and water pressure on the sealing membrane. |
| Key words: vacuum preloading hydraulic reclamation silt pore water pressure Mandel-Cryer effect underconsolidated soil |
