复杂环境基坑支护方案的综合设计

Comprehensive Design of Foundation Pit Support Scheme in Complex Environment

城市建筑基坑附近工程地质环境大都比较复杂,施工空间狭小。采用一般支护方法如桩锚结构,由于受基坑附近建筑物地基中桩体的影响而无法施工;对于基坑边坡土层抗剪强度较低,支护桩嵌入长度较长的,施工难度就更大。本文结合邢台市东部某场地实际案例进行综合设计,采用双排桩+桩中间设置止水帷幕+地基加固,进行基坑支护。双排桩可以提高边坡刚度,桩中间设置止水帷幕可以节约施工空间,有利于解决施工空间的限制问题,可提高地基的抗剪强度,缩短支护桩长度。

Most of the engineering geological environments near the foundation pit of urban buildings are complex with narrow construction space. The general supporting methods, such as pile anchor structure, can not be used be cause of the influence of the existed piles of the around buildings. It is more difficult for the construction when low shear strength of foundation pit slope soil layer and long embedded length of the supporting pile are encountered. Combined with a comprehensive design in Xingtai City, this paper presents a foundation pit support project with double row piles ＋ water proof curtain between piles ＋ foundation reinforcement. Double row piles can increase the slope stiffness, water-proof curtain between piles can save the construction space and is helpful to solve construction space restriction, improve the shear strength of the foundation and shorten the length of supporting piles.