| 静压钢管注浆微型桩抗压与抗拔对比试验研究 |
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| 引用本文： | 宗钟凌,鲁先龙,李青松.静压钢管注浆微型桩抗压与抗拔对比试验研究[J].岩土力学,2018,39(Z1):362-368. |
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| 作者姓名： | 宗钟凌 鲁先龙 李青松 |
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| 作者单位： | 1. 淮海工学院 土木工程学院，连云港，江苏 222005；2. 江苏省海洋资源开发研究院（连云港），连云港，江苏 222005； 3. 中国电力科学研究院，北京102401 |
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| 基金项目： | 江苏省“六大人才”高峰项目（No. 2016-JZ-066）；淮海工学院科研基金项目（No. Z2015008）。 |
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| 摘 要： | 通过现场桩基承载力试验，对静压钢管注浆微型桩抗压与抗拔性能进行了对比分析。基于实测Q-s曲线，研究压力注浆工艺及注浆体积比对微型桩抗压极限承载力、抗拔极限承载力以及极限侧阻力的影响，分析注浆微型桩的桩土作用机理，对微型桩抗拔极限状态进行讨论，建议微型桩设计抗拔系数 极限抗拔位移。研究结果表明，软土地基中静压钢管注浆微型桩较未注浆钢管微型桩，桩基极限承载力提高显著，桩基抗拔性能良好。
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| 关 键 词： | 微型桩 压力注浆 极限承载力 软土地基 施工工艺 |
| 收稿时间： | 2018-04-03 |
Comparison test of compression and uplift on pressure-static and grouting micropiles |
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| ZONG Zhong-ling,LU Xian-long,LI Qin-song.Comparison test of compression and uplift on pressure-static and grouting micropiles[J].Rock and Soil Mechanics,2018,39(Z1):362-368. |
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| Authors: | ZONG Zhong-ling LU Xian-long LI Qin-song |
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| Institution: | 1. College of Civil Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005, China; 2. Marine Resources Development Institute of Jiangsu (Lianyungang), Lianyungang, Jiangsu 222005, China; 3. China Electric Power Research Institute, Beijing 102401, China |
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| Abstract: | Based on the ultimate bearing capacity tests at field site, comparison and analysis between compression and uplift is conducted for pressure-static and post-grouting micropile. A study is carried out in virtue of the Q-s curves to investigate the influence of pressure-grouting process and grouting volume ratios on the bearing capacity and ultimate pile side friction. The pile-soil interaction mechanism and uplift ultimate state is discussed; and then the uplift factor λ and the ultimate uplift displacement are suggested. The results show that compared with micro steel-pipe piles, the ultimate bearing capacity of pressure-static and post-grouting micropiles have been enhanced in soft foundation, especially for the uplift bearing capacity. |
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| Keywords: | micropiles pressure-grouting ultimate bearing capacity soft foundation construction technology |
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