基于土拱效应的耦合结构围桩间距分析

Analysis on the Coupling Structure around the Pile Spacing Based on the Soil Arch Effect

针对一种新型围桩一土耦合结构，从土拱效应出发，结合普氏及桩的绕流阻力理论进行结构内各相邻围桩桩间距分析，得出围桩间距的计算控制式，同时各围桩之间小土拱的存在，推导出结构的桩土耦合直径计算式，通过耦合直径与桩间距、土体参数、桩数的变化规律。研究表明：在黏性土介质为主的，中小型边坡工程，结构采用五或六边形布置，桩间距采用3—4倍围桩桩径是较为经济合理的，并能够实现最佳耦合效果，为耦合结构的工程应用奠定基础。

By according to a new type of pile-soil around coupling structure and starting from the soil arching effect, and analyzing the around the pile spacing of pile structure integrating the theory of M.M promojiyfakonov and flow around resistance within the adjacent, this paper concluded the calculation control type of the pile spacing, and provided a small soil arching between all around the piles were existing, and deduced the coupling calculation formula of structure for the diameter of piles and soil by coupling pile diameter and pile spacing, soil parameters, the change rule of the pile number. Research showed that there is more economic and reasonable in small and medium-sized slope engineering of clayey soil medium-based, using five or six hexagonal structure arrangement, the pile diameter of the pile spacing is 3-4 times, that it can achieve the best coupling effect, and lLay the foundation for the coupling structure of the engineering application.