中文摘要：

对广西四种不同重塑膨胀土试样进行了不同条件下的劈裂实验研究，结果表明，在不同的干密度和含水率条件下，四种膨胀土土样的抗拉强度均先增大后减小，当含水率达到13％，干密度达到1．7g／cm3时，四种膨胀土土样的抗拉强度均达到最大值；四种土样的抗拉强度与其在不同干湿循环次数下裂隙的发育程度具有关联性，抗拉强度是膨胀土裂隙发育的影响因子。

英文摘要：

The split tensile tests were performed on four （4） different remolded expansive soil samples. The relationships of the measured tensile strength varying with dry densities and moisture contents. With the increase of moisture content, the meas- ured strength values of all four types of expansive soils increase and then decrease with moisture contents. At a moisture con- tent of 13% and a dry density of 1.7 g/cm3, the tensile strength of all four types of expansive soil samples reaches the peak value. The fissure development in the samples is found to be related to the number of drying-wetting cycles. The tensile strength of the expansive soil is an important index of evaluatin, the fissure develonment in the soil samDles.