黄河冲洪积土强夯作用下孔隙水压力增长与消散规律

黄河下游冲洪积土以粉土和粉质粘土为主，在夯击能作用下孔隙水压力表现出不同的增长与消散规律。以粉土为主时孔隙水压力增长与消散速度都比较快，适合用强夯的工法进行加固；以粉质粘土为主时，孔隙水压力的增长与消散速度相对较慢，在应用强夯法时，应考虑用低能量、长间歇时间的方法。

INCREASING AND DISSIPATION REGULARITY OF THE PORE WATER PRESSURE UNDER THE DYNAMIC COMPACTION ACTION TO THE ALLUVIAL AND DILUVIUM SOIL OF YELLOW RIVER

The increasing and dissipation regularity of the pore water pressure with depth and broadness under the different hammering energy of the downstream alluvial and diluvium soil of Yellow River is studied by experiment. The experiment results show that increasing and dissipation rate of the pore water pressure under the action of hammering energy of the alluvial and diluvium soil of Yellow River is comparatively high. The influence depth and width of the hammering energy are of the tendency in direct proportion with the magnitude of the hammering energy. This kind of soil is suitable for being compacted by the method of dynamic compaction. The stratum of this area is mainly composed of silty clay,and the increasing and dissipation of the pore water pressure are relativity slow below the groundwater level,under the hammering energy. The recovery of the soil strength will need more time. During the application of dynamic compaction method,the low energy and long resting time method should be considered.