软土地基虹吸排水处理试验研究

EXPERIMENTAL STUDY ON SIPHON DRAINAGE TREATMENT OF SOFT SOIL FOUNDATION

文中尝试虹吸排水进行软土地基处理。在实验过程中监测土体的地下水位变化和土体表面沉降变形。试验结果表明,土体水位线在排水过程中呈漏斗状。水位降低到控制水位线位置后,降水范围内的土体由于孔隙水排出,有效应力增加,土体发生压缩变形;控制线下方土体由于上方重力变化而承受相应荷载逐渐固结。后期进行堆载处理时,引起超孔隙水压力,虹吸将有利于加速孔隙水压力的消散。

In this paper,soft soil is reinforced by siphon method. During the experiment,thechange of groundwater level and deformation of the soil surface are monitored. The results show that thesoil water level line is funnel, shaped during the drainage process. After the water level is reduced to theposition of the control water level line,the effective stress of the soil in the precipitation range increases due to the discharge of pore water,resulting in the compression deformation of the soil and consolidation. The soil under the control line bears the corresponding load and gradually consolidated due tothe gravity change of the soil above it. In the later stage,the excess pore water pressure is caused bythe surcharge treatment,and the siphon will accelerate the dissipation of pore water pressure.