轻型井点降水在土质变形体抗滑治理中的应用

Application of light well point drainage in anti-slide treatment of deformable earth body

井点降水常用于地下水位高出开挖建基面许多或含水丰富的土体基坑工程中,井点降水在土质变形体中的抗滑作用机理在于,通过井点降水,降低地下水位,使土体的含水量减少,提高其抗剪强度及变形体的稳定性,增加其抗滑力。在构皮滩水电站右岸导流隧洞出口明渠南侧土质变形体抗滑治理中采用轻型井点降水法并辅以其配套措施取得成功,使其处于稳定状态,确保了该出口明渠右导墙与明渠基坑的顺利施工。

The sliding resistance mechanism of deformable earth bodies by means of well point drainage lies in lowering the underground water level to reduce the water content of the earth bodies and raise the shear strength, improve the stability of the deformable earth bodies and increase their sliding resistance. The light well point drainage method in combination with other measures was successfully used in the treatment of the deformable earth body on the southern side of the outlet channel of the right- bank diversion tunnel at the Goupitan hydropower station to make the earth body stable, ensuring the smooth construction of the right guide wall and the foundation pit of the outlet channel.