框格式地下连续墙地基加固处理技术浅析

Analysis of foundation reinforcement technology for sash-shaped underground continuous wall

沙坪一级水电站纵向导墙基础框格式地下连续墙施工区域位于泥砾石或粉细砂、淤泥土层上,地基承载力低,且右岸山体侧地下水在施工平台上汇聚,现场积水严重,导致导向墙坍塌。通过降水井限位排水、导向墙尺寸调整、轴线二序槽位置增加临时摩擦桩等措施对地基进行适当加固,较好地解决了施工平台地基变形、槽孔坍塌等问题。实践表明,在软硬相间地基上采取上述加固处理措施安全、有效、可行,可为类似工程提供参考。

The construction area of the sash-shaped underground continuous wall of vertical guide wall foundation in ShapingⅠhydropower station is located on a soil layer of mud gravel,fine sand and silt.The bearing capacity of foundation is low,and the groundwater on the right bank converges on the con-struction platform,causing severe water accumulation on site,leading to the collapse of guide wall.By adopting measures such as drainage through precipitation wells,adjusting the size of guide walls,and adding temporary friction piles at the position of the second step slot,the foundation was appropriately re-inforced,which effectively solved problems of construction platform foundation deformation,slot hole col-lapse and so on.Practice has shown that the above reinforcement measures are safe,effective and feasi-ble for soft and hard alternating foundation,and can provide reference for similar projects.