冲击荷载下饱和软黏土的孔压和变形特性

利用室内动力固结试验装置，对淤泥质饱和软黏土施加冲击荷载，分析在不同围压下施加不同的冲击能量时试样所受的冲击应力、孔隙水压力和轴向变形，发现锤重和落距的组合是影响冲击应力的主要因素。试验表明，轴向变形与冲击次数之间呈对数一双曲线关系，孔隙水压力与冲击次数之间呈单纯的双曲线关系。将室内试验结果同现场测试资料对比表明，模型能较好地模拟现场强夯法处理饱和软土地基。

Experimental study on pore water pressure and axial strain of saturated soft clay under impact load

The characteristics of saturated soft clay under the action of impact load are studied in laboratory by using dynamic consolidation equipment. The impact stress, pore water pressure and axial strain of the soft clay with different confining pressures under the impacts with different energies are measured. It is found that the combination of the hammer weight and dropping height is the main factor influencing the impact stress. Experimental result shows that the relationship between axial strain and impact number is a hyperbolic-logarithmic function and the relationship between pore water pressure and impact number is a hyperbolic function. The comparison of experimental result with field data verifies that the compacting of soft clay foundation in-situ by means of dynamic consolidation method can be well simulated by experiments in laboratory.