多壁座支撑桩承载特性数值模拟研究

Numerical Simulation Research on Bearing Characteristics of Multi-walled Support Piles

为了研究新型多壁座支撑桩抗拔和抗压特性,以长15m、直径0.8m的多壁座支撑桩为研究对象,利用FLAC^3D数值模拟软件,对其水平方向承载力、竖直方向承载力、位移和侧摩阻力等承载特性及桩身荷载传递规律等问题进行研究与分析。分析结果表明,与普通桩相比,多壁座支撑桩的极限抗拔承载力提高了约37%,极限抗压承载力提高约1倍;承载能力提高的同时,多壁座支撑桩具有更小的位移。当多壁座支撑桩所受承载力达到一定值时,侧摩阻力保持不变,壁座支撑处受力呈小幅度上升。

In order to study the pull-out and pressure resistant properties of new-type multi-walled support piles, taking the multi-walled support piles with 15m long and 0.8m in diameter as the research objects, the bearing characteristics of the pile in horizontal direction, vertical direction, displacement and lateral friction and the load transfer law of the pile body were studied and analyzed by using FLAC^3D numerical simulation software. The analysis results show that compared with ordinary piles, the ultimate uplift capacity of multi-walled support piles was increased by about 37%, and the ultimate compressive bearing capacity was increased by about 1 time;while the bearing capacity was improved and the multi-walled support piles had smaller displacement. When the bearing capacity of the multi-walled support pile reached a certain value, the side friction resistance remained unchanged, and the force at the support of the wall seat increased slightly.