铁路桥梁施工中冲击钻灌注桩孔壁稳定性分析  

Stability Analysis of the Hole Wall of Impact Drilling Cast-in-place Piles in Railway Bridge Construction

作　　者：蒲俊吉 PU Jun-ji(China Railway 11th Bureau Group Fifth Engineering Co.,Ltd.,Chongqing 400000,China)

机构地区：[1]中铁十一局集团第五工程有限公司,重庆400000

出　　处：《价值工程》2024年第14期103-105,共3页Value Engineering

摘　　要：探究铁路桥梁施工中冲击钻灌注桩孔壁稳定性对保证桩基的承载性能和桥梁整体的稳定性至关重要。本文依托普里河特大桥工程项目,采用数值模拟方法探究了泥浆重度、钻孔直径及钻孔深度对冲击钻灌注桩孔壁横向位移及桩孔周围地表沉降量的影响。结果表明,增大泥浆重度及钻孔直径对最大孔壁横向位移及地表沉降均有显著影响,泥浆重度越大,孔壁横向位移及地表沉降最大值均越小,孔壁越稳定,增大钻孔直径,孔壁横向位移及地表沉降最大值均增大;改变钻孔深度对孔壁稳定性无明显影响。Exploring the stability of the hole wall of impact drilling cast-in-place piles in railway bridge construction is crucial for ensuring the bearing performance of pile foundations and the overall stability of bridges.This article is based on the Puli River Extra Large Bridge project and uses numerical simulation methods to explore the effects of mud weight,drilling diameter,and drilling depth on the lateral displacement of the impact drilling pile hole wall and the surface settlement around the pile hole.The results showed that increasing the mud weight and drilling diameter had a significant impact on the maximum lateral displacement and surface settlement of the borehole wall.The larger the mud weight,the smaller the maximum lateral displacement and surface settlement of the borehole wall,and the more stable the borehole wall.Increasing the drilling diameter resulted in an increase in the maximum lateral displacement and surface settlement of the borehole wall.Changing the drilling depth has no significant impact on the stability of the borehole wall.

关 键 词：铁路桥梁 冲击钻灌注桩 孔壁稳定性 数值模拟 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]