南水北调禹州段压实膨胀土膨胀性试验研究

以南水北调中线禹州段压实膨胀土为研究对象,通过对压实膨胀土样在不同初始状态下的含水率、干密度和竖向荷载的研究,并用多元线性回归的分析方法,提出了压实膨胀土的膨胀变形随初始含水率、干密度、竖向荷载这三个因素的变化规律,同时获得膨胀力随初始含水率和干密度这两个因素的变化规律。本文总结出压实膨胀土的膨胀变形和膨胀力的计算公式,并对计算公式进行了试验验证,证实了计算公式的正确性。试验结果表明,在实际工程中可以通过少量的试验得到计算公式的参数,并用文中提出的计算公式直接计算出膨胀量和膨胀力的值,以预测膨胀土体对工程可能产生的潜在危害。

Experimental Study on Expansibility of Compacted Expansive Soil in Yuzhou Section of South-North Water Diversion Project

Taking the compacted expansive soil of Yuzhou section in middle Route of South to North Water Diversion Project for the study object and studying on the soil sample under different initial states of moisture contents,dry densities and pressures,this paper presents the variation discipline of the swelling deformation with the above three parameters and the swelling force with the different initial moisture contents and dry densities by multiple linear regression analysis.The calculation formulas of swelling deformation and swelling force for compacted expansive soil are summarized and the validity of them has been confirmed too.The test results show that the formulas can be utilized to calculate the swelling deformation and the swelling force of compacted expansive soil in engineering in order to predict the potential hazards for the project with the parameters obtained by several expansion tests.