真空预压联合导电排水板电渗法加固海相吹填土现场试验

为推动真空预压联合导电排水板电渗法在大规模吹填土地基加固中的应用,依托温州某海相淤泥吹填工程进行了真空预压联合导电排水板电渗法试验,并与真空预压联合金属电极电渗法和常规真空预压法进行了对比试验,对膜下真空度、地表沉降、电流电压变化进行了分析,着重分析了加固后地基承载力增长规律。试验结果表明:导电排水板可以取得与金属电极同等加固效果,导电排水板在电渗加固中具有一定的有效性和可行性,导电排水板的布置方式对加固效果也具有一定的影响;真空预压联合导电排水板电渗试验的地表沉降量超过常规真空预压法9%以上,地基承载力超过常规真空预压法21.4%,土体深层承载力也得到一定程度提高,加固效果显著。

Field tests on marine dredger fill reinforced by vacuum preloading combined with electro-osmosis using electric vertical drains

In order to promote the method of vacuum preloading combined with electro-osmosis using electric vertical drain(EVDs)in large dredger fill foundation reinforcement, field tests on marine dredger fill in Wenzhou City reinforced by this method were conducted. Comparisons of this method with the method of vacuum preloading combined with electro-osmosis using metal electrodes and the conventional vacuum preloading method were performed. Changes in the vacuum pressure, surface settlement, current, and voltage were analyzed, and as was the growth rule of bearing capacity of the foundation after reinforcement. The test results show that EVDs can obtain the same reinforcement effect as metal electrodes, that their use is effective and feasible for electro-osmosis, and that their arrangement has an influence on the reinforcement effect. The surface settlement of the method of vacuum preloading combined with electro-osmosis using EVDs is over 9% larger than that of the conventional vacuum preloading method, and the bearing capacity of the foundation of the former is over 21.4% larger than that of the latter. The bearing capacity of the deep soil increases, and the reinforcement effect is significant.