Method for anchorage body diameter of jet grouting anchor and tests on influence parameters

被引：0
|
作者：
Lu W. [1 ,2 ]
Qin J. [1 ,2 ]
Lou P. [1 ,2 ]
Li H.-L. [1 ,2 ]
Gao P.-S. [1 ,2 ]
机构：
[1] China Institute of Water Resources and Hydropower Research, Beijing
[2] Beijing IWHR Corporation, Beijing
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2016年 / 38卷 / 10期
关键词：
Anchorage body diameter; In situ test; Influence parameter; Jet-grouting anchor;
D O I：
10.11779/CJGE201610006
中图分类号：
学科分类号：
摘要：
The anchorage body diameter is the key factor of the pullout resistance and the reliability of jet grouting anchor. Based on the physical process of jet grouting breaking soil, a convenient calculation method for anchorage body diameter for application is proposed. For the support of 32 m deep-foundation pit in Sanmen Nuclear Power Station, in situ tests are designed to validate the proposed method by comparing 3 excavated anchors of the 12 test anchors. The effect of jet parameters on the anchorage body diameter is also analyzed. The results reveal that under the influences of incomplete breadage and large particle sedimentation of soil, the calculated diameters are smaller than the test data, and the difference between them is larger when the jet pressure is lower and the drilling speed is faster. The jet grouting anchor with flake burrs in surface is approximate to ellipse in shape because of the spiral motion and vibration of the drill pipe. The higher the jet pressure, the faster the drilling speed, leading to more irregular shape. Under the same condition, reaming quality is better by increasing the nozzle diameter and using two times of reaming. In order to improve the reaming efficiency and to avoid the appearance of discontinuous jet profile, the drilling speed should be designed in a suitable range. © 2016, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：1783 / 1788
页数：5
相关论文
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