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针对传统真空预压法加固吹填淤泥地基过程中,存在真空应力小,孔隙水压力消散过慢,深层土体加固效果欠佳,加固后地基标高不够等缺陷,提出了真空预压联合堆载法,即在真空预压真空度稳定后通过堆载满足后期机械进场施工之前宕渣所需的回填,分别采用5Kpa、10Kpa、15Kpa的砂袋堆载方式进行,以增加地基土的标高和总应力,从而增大了排水效率,快速有效的加固了吹填土。试验结果表明,采用真空预压联合堆载法能够加快孔隙水的消散,加速了土体的固结,加固后的土体剪切强度、含水量均优于普通真空预压法,说明真空预压联合堆载法能够更好的加固吹填土淤泥地基。
Aiming at the disadvantages of traditional vacuum preloading method, such as vacuum vacuum stress, excessively slow dissipation of pore water pressure, poor reinforcement effect of deep soil and inadequate elevation of foundation, Law, that is, after the vacuum pre-vacuum degree of stability through the stack to meet the post-mortar construction machinery required for the backfill before the backfill, respectively, using 5Kpa, 10Kpa, 15Kpa sand bag way to increase the elevation of the foundation soil and Total stress, thereby increasing the drainage efficiency, fast and effective reinforcement of dredger fill. The experimental results show that vacuum preloading combined with stowing can accelerate the dissipation of pore water and accelerate the consolidation of soil. The shear strength and water content of soil after consolidation are better than those of ordinary vacuum preloading. Pressure combined stacking method can better consolidate the dredged silt foundation.