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作为沉管砂桩与预排水动力固结法联合加固软土地基的关键技术之一,本文对吹填软土地基上砂桩工艺以及轻型井点降水效果进行分析。现场测试表明,在降水过程中,地下水位呈不断下降趋势,最后当抽水时间达到150h后趋于稳定。此外,由孔隙水压力计测定的孔隙水压力下降值小于地下水位下降引起的静水压力值,这与土层的滞水性和土层的透水性有关。
As one of the key technologies for the consolidation of soft soil foundation with the combination of pipe sinking sand and pre-drainage dynamic consolidation, this paper analyzes the sand pile technology and the effect of light well dewatering on the soft soil foundation. Field tests showed that during the precipitation process, the groundwater level showed a downward trend, and finally stabilized when the pumping time reached 150h. In addition, the pore water pressure drop measured by the pore water pressure gauge is smaller than the hydrostatic pressure caused by the drop of the groundwater level, which is related to the water retention of the soil layer and the water permeability of the soil layer.