温度影响下膨胀土强度的试验研究

通过对河南平顶山膨胀土温度影响下的抗剪强度试验，揭示了膨胀土的强度随温度、含水量、干密度、压力等参数变化的规律。结果表明：相同压力作用下膨胀土强度随含水量不同有较显著的变化，随含水量增加而减小。但当含水量增加到一定程度，强度不再随压力而变化，即内摩擦角为0。当含水量较高时，温度影响显著，相同压力、含水量和干密度情况下，液相为全液体时，随温度的升高抗剪强度增大；当液相有部分结冰时，其规律与干密度的大小有关。含水量较小时，压力较小情况下，温度对抗剪强度影响不明显。

Experimental study of the strength of expansive soil changing with temperature

Shear strength test of expansive soil sampled from Pingdingshan of Henan Province has carried out for studying the strength of expansive soil changing with temperature, water content, dry density and pressure. The results show that the strength of expansive soil has a significant change with water content under the same pressure. When moisture reaches to a certain extent, shear strength would change no more with pressure, that is, the internal friction angle equals to 0. When moisture is higher, temperature has significant effect. Under same pressure, water content and dry density, the shear strength increases with temperature as ice disappears, but it depends on dry density as ice appears. As for smaller water content and less pressure, shear strength depends on temperature insignificantly.