后注浆旋挖钻孔灌注桩承载性能试验及数值模拟研究

柯尊东; 张书豪; 魏海涛; 蔡智; 罗伊

doi:10.20265/j.cnki.issn.1007-2993.2024-0308

后注浆旋挖钻孔灌注桩承载性能试验及数值模拟研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0308

1.
中航勘察设计研究院有限公司，北京　100010
2.
中国核电工程有限公司，北京　100010

详细信息

作者简介:
柯尊东，男，1997年生，硕士，助理工程师，主要从事岩土工程施工及研究工作。E-mail：Kezundon@163.com

中图分类号: TU473
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出版历程
- 收稿日期: 2024-07-06
- 修回日期: 2024-09-22
- 录用日期: 2024-10-29
- 刊出日期: 2025-10-10

Test and numerical simulation on bearing performance of post-grouted rotary drilled piles

1.
AVIC Institute of Geotechnical Engineering Co., Ltd., Beijing 100010, China
2.
China Nuclear Power Engineering Co., Ltd., Beijing 100010, China

摘要

摘要: 后注浆钻孔灌注桩通过后注浆工艺显著提高基桩承载性能，近年来被广泛应用于高层、大跨度建筑。依托四川成都某项目，开展了2组共4根后注浆旋挖钻孔灌注桩的静载荷试验，根据试验结果采用数值模拟研究了不同注浆条件试桩的应力和位移分布，进一步研究了桩侧和桩端注浆量对基桩承载力的影响。研究结果表明：后注浆旋挖钻孔灌注桩拥有较高的承载能力和安全储备，桩侧注浆主要通过增强侧阻力并配合注浆体底部的挤压作用带动桩侧更大范围的岩、土体参与承担荷载，减小桩身变形和沉降；桩端注浆能够在桩端形成强度较高的胶结体，改善桩端应力传递状态，从而防止桩端岩、土体受压屈服并减小其变形；桩侧注浆长度和桩端注浆胶结厚度均能影响基桩极限承载力，后者的影响更为显著。
- 后注浆技术 /
- 旋挖钻孔灌注桩 /
- 加固机理 /
- 静载荷试验 /
- 数值模拟
Abstract: Post-grouting is a widely used pile foundation reinforcement technology in high-rise and large-span buildings. Many engineering practices have verified that this technology can effectively improve the bearing capacity of pile foundations. According to the construction needs of a project in Chengdu, Sichuan, two sets of static load tests were conducted on four post-grouting rotary drilled piles. Based on the test results, numerical simulations were used to study the stress and displacement distributions of the test piles under different grouting conditions, and the effects of the amount of grout injected into the pile side and pile end on the bearing capacity of the foundation were further investigated. The results show that the rotary drilled pile reinforced by post grouting technology has high bearing capacity and safety reserves. The side grouting of the pile mainly drives a larger range of rock mass on the pile side to participate in bearing the load through side resistance and the compression effect at the bottom of the grouting body, reducing the deformation and settlement of the pile body; Grouting at the pile tip can form a high-strength grouting body, improving the stress transmission state at the pile end, thereby preventing the rock mass at the pile end from yielding under compression and reducing its deformation; Changing the length of grouting at the pile side and the thickness of grouting at the pile end can affect the ultimate bearing capacity of the foundation, and the effect of the thickness at the pile end is more significant.
- post-grouting technology /
- rotary drilled piles /
- reinforcement mechanism /
- static load test /
- numerical simulation

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图 1 试桩周围地层剖面

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图 2 注浆管布置情况

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图 3 单桩竖向抗压静载试验设备

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图 4 试桩荷载–沉降曲线

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图 5 试桩s-lg t曲线

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图 6 有限元模型

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图 7 荷载–沉降曲线对比

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图 8 各模型桩身轴力分布

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图 9 各模型应力分布

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图 10 各模型竖向位移分布

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图 11 不同桩侧注浆长度基础承载性能对比

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图 12 不同桩端注浆厚度基础承载性能对比

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表 1 地层物理力学参数

地层	重度γ /（kN·m⁻³）	变形模量 E/MPa	黏聚力 c/kPa	内摩擦角 φ/（°）
①素填土	18.5	0.5	7.6	12.1
②粉土	19.5	5.0	24.0	16.0
③中密卵石	21.5	40	0.0	36.0
④密实卵石	24.0	58	0.0	40.0

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表 2 各试桩参数

试桩编号	桩长l/m	桩径D/mm	混凝土强度等级	注浆方式
3^#	12	800	C45	桩端+桩侧注浆
4^#	12	800	C45	桩端+桩侧注浆
7^#	8	800	C30	桩端注浆
8^#	8	800	C30	桩端注浆

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表 3 各地层极限侧阻力取值

地层	极限侧阻力τ_max/kPa
杂填土	16
粉土	50
中密卵石	140
密实卵石	160

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