天津港真空预压法软基处理监测及检测效果分析

摘要

The ground settlement,layered settlement and pore water pressure has been monitored during the vacuum preloading construction Tianjin Port land area. Dual-curve method is used to calculate the degree of consolidation,provide unloading basis and analyse the settlement of the layer under original seabed. The analysis results show that the above mentioned settlement accounts for 31.9%of the total settlement. The mechanism of soft base reinforcement has been realized through the dissipation law of pore water pressure;Before and after the vacuum preloading construction,bore-hole sampling,indoor geotechnical test and field vane shear test are carried out in order to analyze the physical and mechanical indices of soil layers and the change of vane strength,and evaluate the soft base reinforcement effect.%天津港陆域真空预压施工过程中对地表沉降、分层沉降、孔隙水压力等进行监测。采用双曲线法推算固结度，提供卸载依据；分析原海底以下土层沉降量，得到原海底以下土层沉降量占总沉降量的31.9%；由孔隙水压力消散规律了解软基的加固机理；真空预压前后进行钻探取土室内土工试验及现场十字板剪切试验，分析各土层物理力学指标及十字板强度的变化情况，对地基处理效果进行评价。