高含水率土体强度与含水率和密度的关系研究

为了探索土在不同含水率条件,特别是在高含水率情况下,土的强度与密实度和含水率的关系,进行不同含水率和密实度土样的无侧限抗压强度试验。试验结果表明:在低含水率条件下,土的强度随着密实度的增加而不断提高;在高含水率条件下,土的强度会出现一个与某一临界密实度(压实度大约为95%)相应的峰值,在临界密实度之前,强度随着密度的增加而增加,超过这一临界密实度,土的强度会随着密实度的增加而降低,而且在临界密实度情况下的强度小于最佳含水率和最大干密度情况下土样的强度。

The Study of the Relations between Strength and Percent Moisture Content and Density of an Earth Mass with High Percent Moisture Content

In order to explore the relations between strength, degree of density and percent moisture content of soil under different moisture content conditions and under the high moisture condition in particular, unconfined compression strength tests of soil samples with different moistures and degrees of density were carried out. The test results show that the strength of soil increases with increase of its degree of density under low percent moisture content condition, while under high percent moisture content condition, the strength of soil would reach a peak value that corresponds to a critical density（the compactness is about 95% ）. Before it reaches the critical degree of density, the strength of soil increases with increase of density. When it exceeds the critical degree of density, the strength of soil would decrease with increase of density, and the strength of soil sample under the critical density condition is less than that under the optimum moisture content and max. dry density condition.