Experimental study on axial bearing behavior of super-long and large-diameter bored pile with distributed post-grouting

被引：0
|
作者：
Wang W. [1 ]
Wan Z. [1 ,2 ,3 ]
Dai G. [1 ]
Qian X.
Hu T. [1 ]
Zhou F. [2 ]
Zhang P. [2 ]
机构：
[1] School of Civil Engineering, Southeast University, Nanjing
[2] School of Transportation Engineering, Nanjing Tech University, Nanjing
[3] China Construction Industrial & Energy Engineering Group Co., Ltd, Nanjing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2024年 / 45卷 / 04期
关键词：
cast-in-place bored pile; combined tip-and-side post-grouting; distributed post-grouting; field full-scale test; side resistance; tip resistance;
D O I：
10.14006/j.jzjgxb.2023.A042
中图分类号：
学科分类号：
摘要：
In-situ static load tests on two super-long and large-diameter bored piles before and after grouting were conducted on the basis of the Xiaoqing River re-navigation project in Shandong Province. The influences of the distributed post-grouting on the bearing deformation behavior, load transfer characteristics, side resistance and tip resistance of the super-long and large-diameter bored piles were studied by comparing and analyzing the bearing behaviors of the combined post-grouted and distributed post-grouted piles. The results show that compared with the case before grouting, the bearing capacity of the combined post-grouted pile and the distributed post-grouted pile increases by 39. 6% and 52. 2%, respectively, which shows that the bearing behavior of the distributed post-grouted pile is better than that of the combined post-grouted pile. Distributed post-grouted pile also significantly improves the load transfer characteristics of pile foundation. Under the ultimate load, the side and tip resistances of the combined grouted pile and the distributed grouted pile are significantly improved, which effectively improves the boundary conditions between the pile side and soil and the load bearing conditions of the pile end, and improves the strength and stiffness of the soil at the pile side and end. Moreover, the improvement coefficients of the ultimate side resistance for the distributed post-grouted pile are slightly larger than that of the combined post-grouted pile under the same conditions, and the improvement coefficient of the ultimate side resistance increases with the increase of the buried depth, and the improvement coefficients of the ultimate side resistance has a depth effect. In addition, the transparent soil visualization model test further confirms that the cement grout injected into the distributed post-grouted pile covers the surface more evenly along the pile shaft due to its small spacing, multi-section, high density and multi-depth grouting, forming a more compact and stable pile-grout-soil interaction system, and thus improving the bearing behavior of pile foundation more significantly. © 2024 Science Press. All rights reserved.
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页码：155 / 165
页数：10
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