冲击荷载作用下饱和粉土变形和强度试验

Experimental research on the deformation and strength of saturated silt soil under impact load

围海造地是解决土地紧张的有效途径,其中对软弱吹填土地基进行有效加固处理是围海造地的关键.结合强夯法加固饱和粉土地基的工程实例,通过MTS动三轴试验研究强夯冲击荷载作用对饱和粉土的变形和强度特性的影响.通过动三轴试验采用不同的围压、冲击次数和冲击能量对饱和吹填粉土进行动力固结,结合静三轴试验对比分析了不同的冲击荷载作用后试样强度的变化特征.结果表明:冲击次数和冲击能量是影响饱和粉土地基加固效果的重要因素,存在一个最佳的夯击方式,在该方式下强夯的效果最好.

The reclamation of land from the sea provided an effective method to solve the problem d the growing scarcity of land, and its key is the reinforcement effect of saturated silt foundation. Through the MTS dynamic triaxial test on the basis of a practical case of saturated silt foundation： improved with the dynamic compaction method, this paper studies the defdrmation and strength of saturated silt soil under dynamic compaction load, including the size of confining pressure, the impact number, the im- pact energy on the deformation and the strength of silt soil, especially the strength change ＇of soil sam- ple under impact load. The results show that the impact number and the impact energy are important factors for saturated silt foundation reinforcement engineering, and there exists an optimal dynamic way for saturated silt foundation.