高黏粒含量新近吹填淤泥加固新技术室内研发Ⅱ

Laboratory research on new improvement technology of newly hydraulic reclamation mud with high clay content Ⅱ

为了探讨高黏粒含量新近吹填淤泥地基真空预压一次性处理的可行性,对该类地基的真空固结机理进行深入分析,有针对性地开展分级真空预压条件下不同竖向排水体的室内单井模型对比实验研究.结果表明：竖向排水体反滤层的等效孔径O95应为0.075~0.210mm,袋装砂井应采用粒径范围为0.100~0.810mm的中粗砂作为填充体,两者的渗透系数都应不小于5×10-3 cm/s;当竖向排水体反滤层采用中等等效孔径（如：O95=0.150mm）时,可以采用较快的真空荷载加载速率对高黏粒含量新近吹填淤泥地基进行分级真空预压加固.

In order to explore the feasibility of one-time improving newly hydraulic reclamation mud foundation with high content of clay particles,the vacuum consolidation mechanism for mud was deeply analyzed,and several comparative single well model experiments were performed in laboratory considering the staged loading mode of vacuum pressure and several different types of vertical drain.Results indicated that the characteristic opening size（O95）of filter for vertical drain was suggested with ranging from 0.075 mm to0.210 mm,the medium and coarse sands with its diameter from 0.100 mm to 0.810 mm should be used as filling for sand drained well,and their permeability coefficient was larger than 5×10-3 cm/s.When vertical drain were chosen with the medium characteristic opening size（such as O95=0.15mm）,the step loading of vacuum pressure should be advised with the relatively fast loading rate.