斜直交替倾斜桩支护性能及机理研究  

Study on the supporting performance and mechanism of inclined straight alternating inclined piles

作　　者：张志鹏 ZHANG Zhi-peng(China Railway 18 th Bureau Group No.4 Engineering Co.,Ltd.,300350,Tianjin,China)

机构地区：[1]中铁十八局集团第四工程有限公司,天津300350

出　　处：《建筑技术》2023年第21期2600-2605,共6页Architecture Technology

摘　　要：以天津市某基坑支护工程为例,利用PLAXIS 3D有限元软件对倾斜桩支护进行了参数分析、机理研究与优化设计。研究结果表明,内斜桩与直桩的组合结构中,斜桩起到了斜撑作用,提高了基坑的稳定性。直桩水平位移随着桩长的增加先减小后增大,而斜桩水平位移则呈现一直减小的趋势,且减小效果逐渐减弱,因此选择11 m长的桩较为合适。在倾角增加的过程中,直桩和斜桩的水平位移先减小后增大,在15°~20°时出现最小水平位移值。Based on a foundation pit support project in Tianjin,this paper uses PLAXIS 3D finite element software to analyze the parameters,mechanism and optimize the design of inclined pile support.The results show that in the composite structure of internal battered pile and vertical pile,battered pile acts as diagonal brace,equivalent to compression diagonal brace,while vertical pile mainly bears axial tension.Therefore,the internal force and deformation of the inclined pile support structure are small,and the stability of the foundation pit is high.The horizontal displacement of straight pile and inclined pile decreases with the increase of pile length,and the reduction effect decreases gradually.When selecting the pile length,not only the horizontal displacement but also the economic cost should be considered;The horizontal displacement of straight piles and battered piles decreases first and then increases with the increase of dip angle,and there is a minimum horizontal displacement at 15°~20°,so 15°~20°is a more reasonable tilt angle.

关 键 词：基坑开挖 倾斜桩支护 参数分析 优化设计 

分 类 号：TU78[建筑科学—建筑技术科学]