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粉质黏土在青藏高原多年冻土地区广泛分布,为了充分认识其在冻结状态下的渗透性质,开展了一系列渗透试验测量了在-0.6℃~0.1℃条件下含水率为50%的青藏粉质黏土的渗透系数。结果显示:在高负温区间内,冻结粉质黏土的渗透系数处于8.22×10~(-11)~7.19×10~(-9) cm/s之间;另外,渗透系数与土温之间呈现出幂函数关系,土温越接近于0℃,渗透系数增大越快;冻土的渗透系数表现出随着未冻水体积含量的增加而快速增大的趋势。渗透性的存在可测意味着高温冻土在外荷载下会存在固结作用。
Silty clay is widely distributed in the permafrost regions of the Qinghai-Tibet Plateau. In order to fully understand the permeability of the silty clay in the frozen state, a series of infiltration experiments have been carried out to measure the Tibetan Paleozoic powder with the water content of 50% at -0.6 ℃ ~ 0.1 ℃ Clay permeability coefficient. The results show that the permeability coefficient of frozen silty clay is between 8.22 × 10 ~ (-11) ~ 7.19 × 10 ~ (-9) cm / s in the range of high negative temperature. In addition, between permeability coefficient and soil temperature The relationship between power function and soil temperature is closer to 0 ℃, and the permeability coefficient increases faster. The permeability coefficient of frozen soil shows a tendency to increase rapidly with the increase of volume of unfrozen water. The existence of permeability can be measured means that the permafrost will have consolidation effect under external load.