分级加载真空预压加固吹填流泥试验研究

在分析高黏粒含量吹填土地基经常规真空预压处理后加固效果差、土体强度增长有限原因的基础上,进行分级加载真空预压和常规真空预压现场大型模型试验,探讨分级加载真空预压对流泥固结、变形的影响及其优势。结果表明:吹填流泥处于泥水混合物状态,具有明显的流动性;分级加载真空预压采用初始较小真空荷载且持续较长时间,有利于减缓排水板周围土体过早积聚、固结,给距离排水板较远处土体充分的排水固结时间,有利于改善整个土体的加固效果,且耗电量仅为常规真空预压的60.8%,具有较高的实际应用价值及经济效益。

Field experimental study on dredger fill flow mud improved by graded loading vacuum preloading method

Based on the analysis of reasons for the poor reinforcement effect and the limited strength growth of dredged soil foundation with a high viscosity content after the conventional vacuum preloading, large scale model tests of graded loading vacuum preloading and conventional vacuum preloading are carried out, and the influence and advantage of graded vacuum preloading in the consolidation and deformation of convective clay are discussed. The results show that: the dredged fill mud is in a muddy mixture state with obvious fluidity, and the staged loading vacuum preloading adopts the initial small vacuum load and lasts for a long time. It is beneficial to slow down the prematurely accumulation and consolidation of soil around the drainage plate, and can give the full drainage and consolidation time to soil far from the drainage plate, which is beneficial to the improvement of the whole soil. The power consumption is only 60. 8% of the conventional vacuum preloading, thus it has high practical applicability and economic benefits.