不同固结度真空预压联合堆载加固吹填土室内试验研究

Experimental Study of Vacuum Combine Surcharge Preloading at Different Consolidation Degree

针对滩涂围垦区吹填土处理困难,真空预压处理后无法满足强度和标高要求,传统真空联合堆载处理工期长,效果不尽如人意的问题,通过对五种不同固结度下堆载的联合加固法进行室内模型试验研究,探究堆载时土体固结度对真空联合堆载预压处理效果的影响。通过对试验过程中的数据分析和试验结果检测表明,在土体固结度为27.8%的时候堆载,处理时的出水速率快、出水量大、表层沉降明显,处理后的土体固结度达97.3%,十字板抗剪强度大、含水率低、处理效果较优,说明在固结度较低时堆载,提高了堆载荷载的利用率,改善了处理效果。

Aiming at the questions that coastal reclamation area dredger clay is difficulty to improve,the elevation and strength requirements only improvement by the vacuum preloading is hard to satisfied with,tradition vacuum combine surcharge preloading improvement period is long,etc.the combine method laboratory model test was based for surcharge loading at five different consolidation degree,inquiry surcharge loading consolidation degree to influence with vacuum combine surcharge loading treatment effect.Through the analysis of date during test and detection after laboratory test,it is shown that surcharge loading at 27.8% of consolidation degree,drainage rate fast,drainage large,surface settlement obviously on test processing and soil consolidation degree up to 97.3%,vane shear strength high and moisture content is low after treatment,the treatment effect is better.Explanation that surcharge loading at low consolidation degree improve the utilization rate of the surcharge load,improve the treatment effect.