真空预压法加固吹填土的模型箱试验

大连大窑湾三期工程所处理的土体为含水率＞ 120% 的超软土。为研究超软土的处理方法，采用袋装沙井、滤膜等效孔径80 ～ 100 μm 和孔径＜ 75 μm 的3 种排水体，0. 4 m 及0. 8 m 的2 种排水间距，共计6 个试验箱进行真空预压法试验研究。通过对表面沉降形态进行沉降优化计算，采用3 种模型进行沉降预测，结合监测与计算结果，认为排水体间距为0. 4 m、等效孔径≤75 μm 的国产B 型排水板效果最佳。

Experiment on model box of dredger fill strengthening by vacuum preloading method

The soil dealt with the third project in Dayaowan of Dalian is ultra-soft soil with moisture content 120%.In order to study the processing method of ultra-soft soil,the vacuum preloading experiment of 6 orthogonal model boxes has been done with three drainage bodies（bagged sand well and two kinds of filter membrane with equivalent opening sizes are 80～100 μm and 75 μm） and two drainage distances（0.4 m and 0.8 m）.Using the three models for settlement prediction,through the optimization calculation of the surface settlement morphology,the authors consider that the effect of domestic B-type drainage plate with drainage distance is 0.4 m and equivalent opening size ≤75 μm is the best combined with monitoring and calculation.