深基坑双排桩支护结构变形敏感性分析

Experimental Study on the Effect of Lime Strengthening Soft Soil Subgrade

文中以某深基坑为研究对象,通过数值手段研究基坑施工过程中双排桩支护结构水平变形规律,并系统分析了深基坑双排桩支护结构变形影响因素。研究表明,在一定范围内,双排桩排距对双排桩变形有显著影响,本工程合理的双排桩排距范围为5~6D。在一定范围内提升双排桩桩径和刚度,可以有效控制支护结构水平变形;当双排桩桩径和刚度增大到一定临界值后,增大双排桩桩径和刚度对控制双排桩水平变形效果有限,在连梁高度1.0m范围内增加连梁高度可有效减小双排桩水平变形。

This paper takes a deep foundation pit as the research object,and studies the horizontal deformation law of the double-row pile retaining structure during the foundation pit construction by numerical means.The influence factors of deformation of double-row pile retaining structure in deep foundation pit are analyzed systematically.The research shows that the row spacing of double-row piles has a significant impact on the deformation of double-row piles within a certain range.The reasonable range of row spacing of double-row piles in this project is 5-6D.The horizontal deformation of the supporting structure can be effectively controlled by raising the diameter and rigidity of the double-row piles within a certain range;When the diameter and rigidity of double-row piles increase to a critical value,the effect of increasing the diameter and rigidity of double-row piles on controlling the horizontal deformation of double-row piles is limited.The horizontal deformation of double-row piles can be effectively reduced by increasing the height of coupling beam within 1.Om.