| 钻孔灌注桩端后注浆技术的工程实践 |
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| 引用本文： | 李传铭.钻孔灌注桩端后注浆技术的工程实践[J].中国煤炭地质,2008(7):23-24. |
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| 作者姓名： | 李传铭 |
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| 作者单位： | 湖南省煤田地质局第三勘探队,湖南永州425000 |
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| 基金项目： | 本文承蒙彭正奇、龚玉红教授级高级工程师,伍意德高级工程师的指导,在此一并表示感谢. |
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| 摘 要： | 杭州城东某区块高层建筑原设计以强风化泥质岩作为钻孔桩端持力层，桩长为62—65m。在分析了场地工程地质条件的基础上，认为该设计不利于钻进与混凝土灌注，桩基础成本高，提出了采用钻孔桩端后注浆技术，选择园砾层作为桩端持力层，有效桩长设计为40m。详细介绍了钻孔灌注桩的设计参数、加固机理、工艺流程和施工工艺，总结出注浆技术的实践经验。通过验证砂砾石地层桩端后灌注桩承载力及最大沉降量均达到设计要求．为本地区同类工程的桩基础设计与施工积累了经验。
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| 关 键 词： | 工程地质条件 钻孔灌注桩 注浆技术 |
A Study on Coal Seam Stability Assessment through Contour Method |
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| Li Chuanming.A Study on Coal Seam Stability Assessment through Contour Method[J].Coal Geology of China,2008(7):23-24. |
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| Authors: | Li Chuanming |
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| Institution: | Li Chuanming (The Third Exploration Team, Hunan Bureau of Coal Geological Exploration, Yongzhou, Hunan 425000) |
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| Abstract: | From standards to criteria the coal seam stability is always a qualitative classification, it is difficult to grasp in practical works and cannot be treated equally without discrimination. The mathematical statistics although endow with coal seam stability a quantitative concept, but because of only considering dispersion of each data point, cannot reflect each data point distribution, as well as coal seam changing extent. To select coal seam characteristic parameters in reason and make up contour on the basis of each characteristic value in assessment area is rather intuitional and effective method to assess coal seam stability. |
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| Keywords: | coal seam stability mathematical statistics contour method |
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