狭长型真空预压区边界影响及处理效果模拟分析

Simulation Analysis of Boundary Effect and Treatment Effect of Narrow and Long Vacuum Preloading Zone

以某深厚软土地区道路拓宽工程为研究对象,通过数值模拟结果和现场监测数据分析真空预压法处理该类地基的边界影响效应及沉降差异情况。研究表明:当真空预压处理深度较大时,随加固深度的增大,影响范围并未随之增大;拓宽路基横断面方向,新路基路中和右路肩沉降量相近,处理边界附近真空压力衰减不明显;数值模拟结果与现场监测结果基本一致,数值模拟方法能够准确还原土体自身复杂的本构模型,塑料排水板等效砂井亦具有较高的等效性,说明有限元数值方法在土体固结沉降方面有着较为成熟的应用,对未来真空预压法深入研究有着良好的前景。

Taking the road widening project in a deep soft soil area as the research object,this paper analyzes the boundary effect and settlement difference of this kind of foundation treated by vacuum preloading method through numerical simulation results and field monitoring data.The results show that when the depth of vacuum preloading is large,the influence range does not increase with the increase of reinforcement depth;In the direction of widening the subgrade cross section,the settlement of the new subgrade and the right shoulder is similar,and the vacuum pressure attenuation near the treatment boundary is not obvious;The numerical simulation results are basically consistent with the field monitoring results.The numerical simulation method can accurately restore the complex constitutive model of the soil itself,and the equivalent sand well of the plastic drainage board also has high equivalence,indicating that the finite element numerical method has a mature application in the consolidation and settlement of the soil,and has a good prospect for the in-depth study of the vacuum preloading method in the future.