环境变化对改良土疲劳强度影响的试验研究

改良土是高速、重载铁路路基建设中重要的填筑材料。路基受到列车荷载的长期作用,为保证行车安全,研究改良土的疲劳强度是非常必要的。环境条件的改变将影响改良土的动力性能,特别是失水饱和过程对改良土动力特性有很大的影响。本文通过在试验室内模拟不同的失水饱和过程,初步得到了不同失水率下水泥土疲劳强度变化的趋势。

Experimental Study on the Effect of Environmental Change to Fatigue Strength of Improving Soil

Improving soil is the important material in the construction of express railway and high-load railway. The foundation will be effected by the cyclic load from the train. To guarantee the safety of train, it s very important to study the cyclic fatigue of improving soil. The change of environment will effect the dynamic properties of improving soil, and we especially need to consider the effect of cyclic dry-wet process to the dynamic properties of improving soil. In this paper we simulate the process of cyclic dry-wet in the laboratory and primarily know the trend of change of fatigue strength of cement-soil under different ratio of water lost.