深基坑“空间效应”不同二次加固方式有限元分析

Finite Element Analysis of the Secondary Reinforcement Design of Deep Foundation Pit Based on the "Space Effect"

应用有限元模拟分析的方法,以云南昆明某典型深基坑地层条件为基础,对基坑长边"空间效应"两种不同加固方式进行了研究。研究成果表明:①采用基坑中部一段二次加固方案,当二次加固范围大于0.54 l(l为基坑侧壁长度)时,基坑侧壁水平位移不再增加;②采用基坑中部两段二次加固方案,当二次加固范围大于0.18 l时,基坑侧壁水平位移不再增加;③基坑中部两段二次加固方案在经济和加固效果上优于一段二次加固方案。研究成果对相关工程的设计和施工具有一定的借鉴意义。

Through numerical simulation, the appropriate secondary reinforcement modes and reinforcement ranges have been studied in this paper based on the soil layer structure of a typical deep foundation pit in Kunming, Yunnan province. As shown by calculation, when the one section reinforcement scheme is adopted at the central of foundation, the horizontal dis placement of foundation pit wall scarcely increased after the secondary reinforcement range larger than 0. 54/（/：the length of foundation pit sidewall）, when the two section reinforcement scheme is adopted at the central of foundation, the horizontal dis placement of foundation pit wall scarcely increased after the secondary reinforcement range larger than 0.18l. The two section reinforcement scheme is superior to the one section reinforcement scheme on the cost and reinforcement effect. The results of this paper providing a reference to similar projects.