滨海软弱地基真空联合堆载法地基处理分析

Analysis of Coastal Soft Ground Improvement by Vacuum Surcharge Combined Method

以舟山沿海填土区试验工点的软土为研究对象,进行了一系列现场试验。基于现场真空联合堆载预压试验,对沿海填土区软弱地基的总沉降、分层沉降、孔隙水压力和侧向位移进行了分析。结果表明:在沿海填土区软弱地基采用打设塑料排水板结合真空联合堆载预压法处理软弱地基,地表沉降量与荷载大小的变化趋势一致,真空荷载和堆载越大,沉降量和沉降速率也越大,随后逐渐变小收敛。处理后,地基沉降趋于稳定,地基强度稳定增长,水平位移变化量逐渐减小而趋于稳定,排水固结效果明显,加荷计划的设计、调整和控制是可行的。

A series of soil tests,in-situ tests,and field experiments were conducted focusing on the clay,sampled from the test field in Zhoushan coastal area.Meanwhile,the total settlement,layer settlement,pore water pressure,and lateral displacement were all studied based on Vacuum combined surcharge preloading test.Results show that,in the coastal zone soil foundation by using driving plastic drainage plate with vacuum preloading treatment of soft ground,the trend of surface settlement is consistent with the load size.With great load comes great settlement and settlement rate.And then gradually become smaller and converge.After treatment,ground settlement tends to be stable.Ground strength growth is stable.The horizontal displacement decreases gradually and tends to be stable.Drainage consolidation effect is obvious.It is feasible to design,adjust and control the loading plan.