| 钻孔后压浆技术在苏通大桥基础工程中的应用 |
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| 引用本文： | 布克明,殷坤龙,龚维明.钻孔后压浆技术在苏通大桥基础工程中的应用[J].岩土力学,2008,29(6):1697-1700. |
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| 作者姓名： | 布克明 殷坤龙 龚维明 |
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| 作者单位： | 1.中国地质大学 工程学院，武汉430074；2.交通部第二公路勘察设计院，武汉 430056; 3. 东南大学 土木工程学院，南京210096 |
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| 摘 要： | 钻孔灌注桩后压浆技术，使水泥浆液在高压下渗透、充填和挤密，与沉渣、泥皮、桩周和桩端土体发生物理化学固结，增大了土体和桩端的强度，改变了桩的受力类型，提高了桩侧摩阻力和端阻力，从而提高了单桩的承载力。在苏通大桥超长大直径桩中应用了桩底后压浆技术。通过试桩静载试验，决定在工程施工中采用U型压浆管方案。试桩结果表明，压浆后极限承载力测试值是压浆前的1.48～2.0倍，压浆后端阻力是压浆前的2.46～7.21倍，表明利用后压浆技术达到了节约工程投资、提高工程施工质量及可靠性的目的，并产生了较大的技术经济效益和良好的社会环境效益，这将促进我国公路桥梁建设的桩基技术迈向一个新台阶。
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| 关 键 词： | 钻孔灌注桩 后压浆技术 苏通长江大桥 桩端阻力 桩侧摩阻力 |
| 收稿时间： | 2006-07-18 |
Post-grouting technique for piled foundation:Case history of Su-Tong Bridge |
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| BU Ke-ming,YIN Kun-long,GONG Wei-ming.Post-grouting technique for piled foundation:Case history of Su-Tong Bridge[J].Rock and Soil Mechanics,2008,29(6):1697-1700. |
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| Authors: | BU Ke-ming YIN Kun-long GONG Wei-ming |
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| Institution: | 1. Engineering Faculty, China University of Geosciences, Wuhan 430074, China; 2. China Communications Second Highway Survey, Design and Research Institute,Wuhan 430056, China; 3. College of Civil Engineering, Southeast University, Nanjing 210096, China |
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| Abstract: | Post-grouting technique has a wide range application to piled foundations. The principle of post-grouting technique is as follows: through grouting cement into bottom of bored pile or around pile body, the loose material such as deposit and slime during pile construction can be strengthened; and it can highly increase frictional resistance and end bearing capacity of pile. Post-grouting technique was successfully employed in the piled foundation of Su-Tong Bridge, a huge bridge under construction which connects Suzhou City and Nantong City in Jiangsu Province, China. According to the results of static load tests, the U-shape grouting pipe was used in the project for the piles’ bottom grouting. After grouted, values of the ultimate bearing capacity of the tested piles were increased up to1.48-2.0 times the ones of un-grouted bored piles. For end bearing capacities, their values were increased up to 2.46-7.21 times. It can be drawn a conclusion that through using post-grouting technique, it saves investment, improves construction quality and reliability, and brings considerable economic benefits and well social environment effects as well. |
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| Keywords: | bored pile post-grouting technique Su-Tong bridge pile tip resistance side friction |
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