压实黄土冻融后的强度特性试验研究

Experimental Study on the Strength Characteristics of Compacted Loess after Freezing and Thawing

冻融作为典型的风化作用,对边坡、路基具有强烈的破坏作用。本文以宁夏同心黄土为研究对象,将不同压实度、饱和度条件下的重塑黄土进行冻融循环,然后对经历长期冻融循环后的土进行剪切试验。试验结果发现:经过多次冻融循环后,黄土的抗剪强度变小,主要原因是压实度和饱和度下降,具体表现形式为脆性破坏和塑性破坏。

Freeze-thaw,as a typical weathering effect,exerts a strong destructive effect on slopes and roadbeds.In this paper,the Ningxia Tongxin loess is taken as the research object,and the remodeled loess under different compaction and saturation conditions is subjected to freeze-thaw cycles,and then the shear test is conducted on the soil after long-term freeze-thaw cycles.The test results show that the shear strength of loess decreases after several freeze-thaw cycles,mainly due to the decrease of compaction and saturation,which was manifested as brittle failure and plastic failure.