真空预压加固河漫滩软基的变形监测及效果分析

Deformation monitoring result of floodplain consolidated by vacuum preloading

介绍长江河漫滩地区软土工程特性及真空预压在南京河漫滩软基处理的应用。从土体的变形、孔隙水压的消散、水位的变化、水平位移、加固前后土层土工参数的变化、十字板试验等各方面评价了真空预压加固河漫滩软基的效果,监测结果说明真空预压加固后,固结度达到90%以上,工后沉降减少,土体强度得到明显提高,真空预压在河漫滩软基处理取得理想效果。

This paper introduces the properties of Yangtze River floodplain soft soil engineering and application of vacuum preloading in Nanjing river floodplain,evaluates the effect of vacuum preloading for soft soil consolidation of river floodplain from such aspects as the deformation of soil pore water pressure dissipation,changes in water level,horizontal displacement,reinforcement before and after the changes of geotechnical parameters of soil,VST,etc.Monitoring results show that the soil strength can be improved significantly and the consolidation got more than 90% degree,with less post-construction settlement.Vacuum preloading has achieved satisfactory results in soft soil treatment for river floodplain.