潮汐对软基处理排水固结的影响

Influence of tide on soft base treatment

近海地区的地下水位会随着潮汐波动。通过对位于软基处理有效加固区和水位变动区的土体进行实地监测,研究水位变动对土体表层沉降、孔隙水压力和处理效果产生的影响。结果表明:处于水位变动区的土体孔隙水压力消散不完全,退潮引起水位下降,土体排出水分时会形成暗涌,掏走土体中的小颗粒,削弱土体稳定性和强度。因此,在相关工程中应考虑场地水位变化,可以在场地红线处推填形成围堰并布设黏土密封墙、打设钢板桩或在场地边缘和中间均匀布设降水井等,避免地下水位变动对工程质量造成影响。

The water level in the coastal areas will fluctuate with the tides,and by doing field monitoring of the soil in the region of the soft base and the changing areas of the water level,we study the effects of water level changes on the surface of the earth,the pressure of the pore water,and the effects of the process.The result shows that the water pressure dissipation is incomplete in the soil in the changing area of the water level,the receding tide causes the drop of the water level,the soil will form a dark surge in the discharge of water,and the small particles in the soil will be taken out to weaken the stability and strength the soil.So,we shall consider the change of the field’s water level and may take measures such as filling a cofferdam and building a clay sealing wall along the field line,driving the steel sheet pile,or arranging evenly the dewatering well on the edge or in the middle of the field to avoid the influence of the change of underground water level on the engineering quality.