含水量对非饱和重塑膨胀土抗剪强度和压实度的影响

Influence of Water Content on Shear Strength and Compactness of Unsaturated Remolded Expansive Soils

含水量是影响膨胀土抗剪强度和压实度的重要因素。通过多组室内快剪试验,采用多元线性回归方法,分别对非饱和重塑膨胀土抗剪强度指标和压实度与其含水量的关系进行了研究。试验研究结果表明,非饱和重塑膨胀土的压实度随着含水量增加而逐渐降低,且当法向应力较低时,抗剪强度随着压实度的增加而缓慢增大,但当法向应力较大时,抗剪强度随着压实度增加而增大较快。非饱和重塑膨胀土抗剪强度指标受含水量的影响较为明显,当法向应力较低时,抗剪强度随着含水量的增加而增大,但当法向应力较大时,抗剪强度随着的含水量增加而增大的不太明显,出现含水量增加而抗剪强度基本不变的情况。

The water content is an important factor affecting compaction degree of expansive soil and its shear strength. According to multiple groups of fast shear test in laboratory, the relationship between shear strength and compactness as well as water content are analyzed respectively by using multiple linear regression method through measuring the soil shear strength and compaction degree characteristics under different water content conditions. The tests result shows that the degree of compaction of unsaturated remolded expansive soil decreases gradually with the increase of water content, and the shear strength increases slowly with the increase of the degree of compaction when the normal stress is low, but the shear strength increases rapidly with increase of the degree of compaction when the normal stress is larger. The shear strength of unsaturated remolded expansive soil is evidently affected by water content, and the shear strength increases with water content＇s increase when normal stress is low, but the shear strength, when normal stress is larger, increases less apparently with water content＇s increase, seems unchanged with the water content increases.