黄土基坑管桩支护结构水平位移数值分析  

Numerical Analysis of Horizontal Displacement in Pile-Supported Structure of Loess Excavation Pit

作　　者：卜崇鹏 顾怀全 张小辉 王明皎 慕浪浪 黄伟 BU Chongpeng;GU Huaiquan;ZHANG Xiaohui;WANG Mingjiao;MU Langlang;HUANG Wei

机构地区：[1]机械工业勘察设计研究院有限公司,陕西西安710043 [2]重庆科技大学建筑工程学院,重庆401331 [3]建华建材(陕西)有限公司,陕西西安712000

出　　处：《重庆建筑》2024年第6期52-55,共4页Chongqing Architecture

基　　金：重庆市自然科学基金面上项目“基于微生物矿化技术的边坡表面侵蚀控制研究”(cstc2019jcyj-msxmX0258)。

摘　　要：管桩在黄土基坑支护中被广泛应用,但目前对影响该支护结构水平位移的设计参数仍有进一步优化的空间。该文基于数值模拟方法,对某黄土基坑的开挖支护过程进行模拟,探究锚索和管桩参数对支护桩水平位移的影响。结果表明:总体上管桩位移曲线呈“凸肚形”,最大水平位移出现在桩长5 m处;锚索参数对支护桩水平位移影响较大,锚索的自由段长度增加3 m,预应力增加60 kN,支护桩水平位移减小幅度分别约56%和60%;适当增加管桩桩长和桩径对水平位移也有一定的约束效果,管桩长度10 m为最佳桩长,外径的最佳范围为600~800 mm。研究结果对预制管桩在黄土基坑中的工程设计和优化具有一定指导意义。Pile-supported structures are widely used in loess excavation pits,yet there is stll room for further optimization of design parameters affecting horizontal displacement.This paper utilizes numerical simulation methods to model the excavation and support process of a loess excavation pit,investigating the impact of anchor and pile parameters on the horizontal displacement of support piles.The results indicate that the displacement curve of piles generally exhibits a"bulging"shape,with maximum horizontal displacement occurring at a pile length of 5 meters.Anchor parameters significantly influence the horizontal displacement of support piles;increasing the free segment length of anchors by 3 meters and pre-tension by 60 kN reduces horizontal displacement by approximately 56%and 60%,respectively.Additionally,increasing the pile length and diameter appropriately also contributes to constraining horizontal displacement;a pile length of 10 meters and an outer diameter ranging from 600 to 800 mm are found to be optimal.These findings provide guidance for the engineering design and optimization of prefabricated pile applications in loess excavation pits.

关 键 词：黄土基坑 预制管桩 水平位移 数值模拟 

分 类 号：TU753[建筑科学—建筑技术科学]