新型分阶段真空预压模型试验研究

摘要

In view of the defects of general vacuum preloading method such as vacuum degree delivery deficit, slow pore water pressure dissipation, serious siltation, long construction period and poor deep soil consolidation effect and so on, and on the basis of the previous vacuum preloading method, the new grading vacuum preloading experiment is studied. The cumulative settlement, vacuum degree, pore water pressure, shear strength, moisture content and water yield of the new method are compared with those of the general vacuum preloading model experiment. The experimental results show that: the upper soil parameters are roughly equal, but the lower soil indicators are superior to the latter. It indicates that the grading vacuum preloading method can well transfer vacuum to deep soil, accelerate the pore water pressure dissipation, mitigate siltation phenomenon, shorten time limit for a project, and achieve good reinforcement effect.%针对普通真空预压法的真空度传递不足、孔隙水压力消散过慢，淤堵现象严重，工期漫长和深层土体加固效果欠佳等缺点，在以前的真空预压法的基础上，进行了新型分阶段真空预压试验研究，并和普通真空预压法模型试验的累积沉降量、真空度、孔隙水压力、抗剪强度、含水率和出水量等指标进行对比分析，试验结果表明：上层土体的各项参数大致相等，但其下层土体的各项指标明显优于后者。说明分阶段真空预压法能够较好地将真空度传递到深层土体、加快孔隙水压力消散、缓解淤堵现象、缩短工期，并取得良好加固效果。