荷载与水位波动耦合作用下粉土的固结性状研究

Study on consolidation behavior of silty soil under coupling action of load and water level fluctuation

利用自制的试验装置,对上海地区粉土试样进行了荷载与水位波动耦合作用的固结模型试验。实测了粉土试样的变形、土压、孔压变化情况。并在固结变形稳定后,取样进行了固结—渗透联合测定试验,分析了荷载与水位波动耦合作用下粉土试样的固结变形和渗透特性。试验结果表明:粉土试样的固结变形集中在荷载与排水耦合作用阶段,并随排水量的增加而线性增大;在荷载与水位波动耦合作用下,粉土试样的固结程度提高,孔隙比减小,渗透特性有所降低。研究成果对沿海城市的地面沉降预测具有重要参考价值。

The consolidation test is conducted using self-made device on silty soil under the coupling action of load and water level fluctuation.The changes of settlement,earth pressure and pore pressure are being monitored.As the consolidation steady,the combined determination test of permeability and consolidation is conducted on specimens.The deformation,strength and permeability of the silty soil under coupling action of load and water level fluctuation are analyzed.The test results show that the consolidation deformation of silty soil mainly occurred in the stage of the coupling action stage,and increases linearly with the increment of water discharge quantity;under the coupling action of load and water level fluctuation,the consolidation degree of silty soil increases,the void ratio reduces,the seepage properties decreases.The study result has valuable reference to forecast the land subsidence in the coastal cities.