成都地区膨胀岩土原位剪切试验研究

In-situ Shear Test Studies on the Expansive Rock and Soil in Chengdu Area

以成都望江锦园膨胀岩土体为试验对象,根据压剪实验及一次水平剪切试验得出该地区膨胀土的抗剪强度指标以及抗剪强度变化特征。试验结果表明,在相同法向压力作用下,受雨水影响小的深层土壤抗剪强度比表层土体高,深层膨胀土的抗剪强度指标均比浅层膨胀土大,这说明控制土体的含水量对于实际工程的稳定性具有重要的意义。

Both the shear strength indices and the stress-strain characteristic of the expansive soil and rock materials in Chengdu Wangjiangjinyuan are studied by the in-situ pressure-shear tests and horizontal shear test. The test results show that, under the same normal stress, the soil samples from deeper depths which has less influence by the precipitation has a higher shear strength and much larger shear strength indices than samples from the shallower depth. The shear strength values have strong correlations with the water content of the soil samples. It is concluded that the importance of control the water content during the construction.