双排桩支承肋柱式桩板墙联合锚碇墙结构数值研究

A Numerical Study on the Combined Anchor Wall Structure of the Double-Row Pile-Supported Ribbed Column Pile Sheet Wall

针对重力式挡墙无法满足错综复杂场地支护需要的问题,提出一种双排桩支承肋柱式桩板墙联合锚碇墙的新型支挡结构,依托青岛某高填方边坡工程项目,基于数值模拟软件FLAC^(3D)分别建立了锚索及刚性加筋板的新型锚碇板墙和双排桩支承肋柱式桩板墙联合锚碇墙的边坡支护数值模型。并对该边坡在两种支护结构下的安全稳定系数、挡墙位移及桩板墙弯矩受力情况进行对比分析。数据表明:采用锚索及刚性加筋板的新型锚碇板墙支护结构的边坡安全稳定系数、挡墙顶部位移及桩板墙最大弯矩分别为13.6、0.261 m及593 kN·m;而采用双排桩支承肋柱式桩板墙联合锚碇墙支护结构的边坡安全稳定系数、挡墙顶部位移及桩板墙最大弯矩分别为13.9、0.225 6 m、269.3 kN·m。双排桩支承肋柱式桩板墙联合锚碇墙支护结构具有更好的安全性及抗变形能力。随后对双排桩支承肋柱式桩板墙联合锚碇墙结构的设计参数进行研究,发现随着桩长、桩径增大,支护结构具有更强的抗横向变形能力。

In view of the problem that gravity retaining walls fail to meet the needs of complex site support,a new type of support structure has thus been proposed with the combined anchor wall of the double row pile supported ribbed column pile plate wall.Based on a high fll slope engineering project in Qingdao,numerical simulation software FLAC3D is used to establish numerical models for slope support of new anchor plate walls with anchor cables and rigid reinforced plates,as well as the combined anchor wall of the double row pile supported ribbed column pile plate wall,followed by a comparison and analysis of the safety and stability coefficient,retaining wall displacement,and pile sheet wall bending moment stress of the slope under two types of support structures.The data shows that the slope safety stability coefficient,top displacement of the retaining wall,and maximum bending moment of the pile plate wall supported by a new type of anchor plate wall structure using anchor cables and rigid reinforced plates are 13.6,0.261 m and 593 kN-m,respectively.The slope safety and stability coefficient,top displacement of the retaining wall,and maximum bending moments of the pile sheet wall supported by double row piles and ribbed column pile sheet wall combined with anchor wall support structure are 13.9,0.2256 m and 269.3 kN-m respectively.The double row pile supported ribbed column pile plate wall combined with anchor wall support structure is characterized with a better safety and deformation resistance ability.Subsequently,a study is conducted on the design parameters of the combined anchor wall structure of the double row pile supported ribbed column pile sheet wall,and it is found that the support structure exhibits a stronger resistance to lateral deformation with the increase of the pile length and diameter.