真空联合堆载预压加固含承压水软基中水位和出水量变化规律研究

对含承压水地层的真空联合堆载预压地下水位和出水量变化进行了分析和研究。现场测试结果表明，（1）撕膜和非撕膜的塑排板施工工艺能有效防止承压水贯通，真空联合堆载预压加固软基效果较为明显；（2）联合预压期间地下水位相对稳定，最大水位下降值为1.8 m，工程后期SW2水位上升约1.0 m，说明加固区局部已贯通承压水层；（3）加固区内外承压水水位变化具有类似的规律，加固区内外水位变化分别受真空度分布和降雨的影响；（4）抽真空初期出水量较大，随着抽真空时间增加出水量迅速减小，在工程后期单泵出水量小于同一地区相同工法加固深厚软基的单泵出水量，说明研究区真空联合堆载预压并未完全贯通承压水地层。

Study on groundwater table and water flux of soft soil with confined water by vacuum-surcharge preloading

The variations of groundwater table and water flux are analyzed and studied in soft soil with confined water stratum by vacuum-surcharge preloading. The field test results indicate: (1) technology of ‘tearing membrane’ and ‘non-tearing membrane’ could effectively prevent the connectivity of confined water; (2) groundwater table at later stage is quite stable and the maximum dropping is 1.8 meter, SW2 arises about 1.0m, which indicates this area is partially penetrated by confined water; (3) confined water table at inward and outward is quite similar, they are separately influenced by degree of vacuum and rainfall; (4) water flux is very large at early stage, which diminishes sharply with time, and water flux of single vacuum pump is less than the one at the same zone by the same method, which indicates soft soil never completely connect the confined water stratum by vacuum-surcharge preloading.