岩土与地下工程 2025年 第卷 第07期

DOI: 10.7672 / sgjs2025070102

超厚砂层地质条件下旋挖钻孔灌注桩施工技术

何艳龙¹’²,赵付强¹’²,许晓轩¹’²

作者简介:

何艳龙,项目常务副经理,副高级工程师,E⁃mail:heyl@ccrbnc. com

作者单位:

1.中交路桥建设有限公司,北京 100027; 2.中交路桥华北工程有限公司,北京 101100

基金项目:

∗中交路桥建设有限公司科研课题:厚砂层、岩溶发育地质桥梁桩基施工技术研究(ZJLJ⁃2024⁃86)

摘要:

以济微高速 JWSG⁃4 标岩溶施工项目为研究对象,分析了旋挖钻孔灌注桩施工技术及优化方案,并使用静荷载试验测试桩体性能。研究结果显示,直桩试验桩与工程桩的平均回弹率分别为 22.7%与 26.9%,并且随着桩顶施加荷载的增长,Y1 与 Y2 分担桩顶荷载也在不断增长,占比分别为 6.3%—— 25.3%,6. 3%—— 22. 0%.

English:

Taking the karst construction project of the JWSG⁃4section of the Jinan⁃Weishan Expresswayas the research object, the construction technology and optimization scheme of rotary drilled grouting pilesare analyzed, and the performance of the pile body is tested by static load tests. The results indicate thatthe average rebound rate of the test pile and the engineering pile of the straight piles is 22.7% and26.9%, respectively. With the increase in the pile top load, the load on the top of the pile shared by Y1and Y2 is also increasing, accounting for 6.3%——25.3% and 6.3 %——22.0%, respectively.