真空预压处理吹填土的压缩率计算方法研究

Research on Calculation Method about Compression Ratio of Dredger Fill under Vacuum-Preload

针对吹填土经真空预压处理后压缩率计算及预测难的问题,采用理论研究和模型试验的方法,推导得到了基于土的物理参数含水率、密度和土粒比重的吹填土压缩率计算公式。结合多个工程实例对真空预压处理后吹填土的含水率、密度及孔隙比与塑性指数的关系进行了统计分析,并建立了关系曲线用于吹填土真空预压处理后指标的预测,形成了由计算公式及处理后指标预测构成的吹填土压缩率计算方法。该方法的实际应用结果表明,预测压缩率与实际监测压缩率有较好的一致性,可以为以后类似工程吹填土压缩率的计算和预测提供参考。

To solve the difficulty in calculation and prediction of compression ratio of dredger fill under vacuum-preload,the combination of theoretical study and model test leads to a formula for calculating the compression ratio of dredger fill based on such physical parameters as water content,density and specific gravity of soil.The relationship among water content,density,porosity ratio and plastic index of the treated dredger fill are counted and analyzed by referring to several projects.A relationship curve is built in order to predict the indicators of the dredger fill under vacuum-preload,which is combined with the above formula to form a calculation method for the compression rate of dredger fill.Its application results show that the predicted compression rate is in line with real-measured compression rate,and serve as a reference for similar projects in the future.