不同温度及排水条件下高温冻土孔隙水压力试验研究

在荷载的作用下孔隙水压力的消散是揭示冻土整体变形机理的关键，为了研究高温冻土中孔隙水压力变化规律，在不同温度、不同排水条件下，对高温冻土开展了压缩固结试验，并监测其在-1℃、-0.5℃和-0.3℃的条件下孔隙水压力及位移变化情况。结果表明：温度对孔压、变形有较大影响，温度越高，土体的变形速率越大，孔隙水压力峰值越大，消散速率也越快；而温度相同时，排水条件下的孔压峰值比不排水条件下的低，位移比不排水条件下的大；从试验结果中可以认识到，孔隙水压力在受骨架挤压增大的同时也在缓慢消散。

Experimental study of pore water pressure of high temperature frozen soil under different temperatures and drainage conditions

Variation of pore-water pressure is a key to reveal the deformation mechanisms of soil under an external load. In order to study the property of pore-water pressure in warm frozen soil, compressive consolidation experiment under different temperatures and different drainage conditions have been carried out. The pore-water pressure and displacement at -1, -0.5 and -0.3℃ were monitored respectively. The results reveal that temperature has great effect on pore-water pressure and deformation of warm frozen soil. When the temperature is higher, the deformation rate of the soil, the peak pore-water pressure and the rate of dissipation are greater. At the same temperature, the peak pore-water pressure under drainage condition is lower than that under non-drainage condition, but the displacement is larger than the latter. It can be found from the results that the pore-water pressure is subjected to two actions simultaneously:increase caused by solid skeleton compression and slowly dissipation.