许滨华, 何宁, 周彦章, 姜彦彬, 朱群峰. 真空预压加固吹填淤泥地基的孔隙水压力特性[J]. 水利水运工程学报, 2017, (2): 45-50. DOI: 10.16198/j.cnki.1009-640X.2017.02.006
引用本文: 许滨华, 何宁, 周彦章, 姜彦彬, 朱群峰. 真空预压加固吹填淤泥地基的孔隙水压力特性[J]. 水利水运工程学报, 2017, (2): 45-50. DOI: 10.16198/j.cnki.1009-640X.2017.02.006
XU Binhua, HE Ning, ZHOU Yanzhang, JIANG Yanbin, ZHU Qunfeng. Discussion on characteristics of pore pressure in hydraulic reclamation silt foundation under vacuum preloading[J]. Hydro-Science and Engineering, 2017, (2): 45-50. DOI: 10.16198/j.cnki.1009-640X.2017.02.006
Citation: XU Binhua, HE Ning, ZHOU Yanzhang, JIANG Yanbin, ZHU Qunfeng. Discussion on characteristics of pore pressure in hydraulic reclamation silt foundation under vacuum preloading[J]. Hydro-Science and Engineering, 2017, (2): 45-50. DOI: 10.16198/j.cnki.1009-640X.2017.02.006

真空预压加固吹填淤泥地基的孔隙水压力特性

Discussion on characteristics of pore pressure in hydraulic reclamation silt foundation under vacuum preloading

  • 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。

     

    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.

     

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