【摘要】 以南水北调中线一期工程南阳陶岔-沙河南渠段中等膨胀土为研究对象,对压实膨胀土的膨胀变形进行了研究探讨,并对不同初始含水率、压实度和上部荷载的线胀率进行了拟合分析,得到压实膨胀土在有侧限约束条件下的有荷膨胀率与上部荷载之间呈半对数关系,在此基础上,提出了同时考虑压实度、含水率和上部荷载的拟合方程,并可用此方程对实际工程的膨胀变形量进行简单计算.结果表明:用一定厚度的非膨胀土填盖中等膨胀土渠坡,可以有效抑制渠坡的膨胀变形.更多还原

【Abstract】 This paper takes the Nanyang medium expansive soil at the Taocha-Shahe test zone as a study example.The compacted expansive soil′s swelling deformation is discussed.And then,the linear regression analysis for expansive soil with different vertical loads,initial water content and dry density is carried out,and some results have been obtained.The results show that the swelling ratio is of hyperbolic relationship versus vertical loads in semi-logarithmic coordinates.Using the corresponding formulas to calculate the swelling deformation is feasible in actual project,and it is effective to restrain the deformation with certain thickness of non-expansive soil covering on the medium expansive soil slope.The research can supply scientific reference for the design and construction of expansive soil slope in the middle-route of the South-to-North Water Diversion Project.更多还原