滨州港直排式真空预压软基处理监测及检测效果

在滨州港直排式真空预压施工过程中，对地表沉降、地下水位、孔隙水压力进行监测，并通过深层真空预压前后的土工试验，分析各土层物理力学指标及十字板强度变化，对地基处理效果进行评价。结果表明，水位下降情况与地表沉降情况在真空预压期间相关性极高；不同土质在排水板打设后短时间内，孔压消散值会出现增加和减小两种情况；对于渗透性较弱的淤泥质黏土、黏土层等，短时间内膜下真空度的变化对其孔压基本不产生影响。

Monitoring and detection effect for soft base reinforced by straight-line vacuum preloading method in Binzhou Port

During the straight-line vacuum preloading construction of Binzhou Port,we monitor the surface settlement,groundwater level and pore water pressure.By the indoor geotechnical test before and after the vacuum preloading construction,we analyze the physical and mechanical indices of soil layers and the change of vane strength,and evaluate the soft base reinforcement effect.The results show that the correlation between water level decline and surface subsidence is very high during vacuum preloading.The dissipation value of pore pressure increases and decreases in the short time after the drainage plate is set.For the silty clay and clay layer with weak permeability,the change of vacuum under the membrane in a short time has little effect on pore pressure.