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TEST COMPARISON OF INFLUENCE OF PRESSURE GROUTING ON UPLIFT CAPACITY OF MICROPILES
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摘要: 微型桩一般采用投石注浆法成桩，因此压力注浆工艺对微型桩承载力具有很大的影响。结合现场试验，对压力注浆工艺对微型桩抗拔承载力的影响展开研究。试验研究表明，采用一次注浆成桩和直接灌注细石混凝土成桩的微型桩抗拔承载力相差不大，而采用二次注浆工艺可较大幅度提高微型桩的抗拔承载力，适当增大二次注浆量有利于提高微型桩的抗拔承载力。对于采用二次注浆工艺的微型桩，其抗拔承载力计算应考虑二次注浆的提升效应。Abstract: Micropiles commonly use pressure grouting method,which influences the uplift capacity of micropiles.In this paper,field tests about influence of pressure grouting on uplift capacity of micropiles were reported.Study shows that the uplift capacity of primary grouted micropiles is almost the same as the uplift capacity of concrete micropiles.However the uplift capacity of secondary grouted micropiles is enhanced.Increasing the amount of the second-grouting properly can help micropiles enhance the uplift capacity.Calculating the uplift capacity of secondary grouted micropiles must consider the effect of the second-grouting.
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Key words:
- pressure grouting /
- micropile /
- uplift capacity /
- secondary grouting
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[2] 杨永浩.微型桩技术试验及其应用[J].地基处理, 1992, 3(4):27－36. Bruce D A, DiMillio A F, Juran I.Introduction to Micropiles :AnInternational Perspective, Foundation Upgrading [G]//Geotechnical Special Publication and Repair for InfrastructureImprovement.Edited by Kane W F, Tehaney J M.GeotechnicalSpecial Publication.ASCE, New York:1995, 50(10):1－26. [3] Cadden A W, Bruce D A, Ciamptti L M.Micropiles in Karst:ACase History of Difficulties and Success [G]//Foundations andGround Improvement.Edited by Brandon T L.GeotechnicalSpecial Publication, ASCE, New York:2001, 113:204－215. [4] 吕凡任, 陈仁朋, 陈云敏, 等.软土地基上微型桩抗压和抗拔特性试验研究[J].土木工程学报, 2005, 38(3):99－105. [5] 苏荣臻, 郑卫锋, 鲁先龙.等.软土地区杆塔基础微型桩抗拔特性试验研究[J].电力建设, 2008, 29(12):23－25. [6] 苏荣臻, 郑卫锋.微型桩基础施工工艺研究[J].特高压送变电动态报道, 2007, 5:1－3. [7] 程华龙.注浆微型桩加固软土地基的机理与设计计算[J].地质科技情报, 1999, 18:54－56. [8] 廖永忠, 陈代君.树根桩的施工方法及二次注浆的重要性浅析[J].西部探矿工程, 2005, 17(3). [9] 史佩栋.桩基工程手册[M].北京:人民交通出版社, 2008. [10] 周勇发, 蔡兴杰, 龚健.软土地基中杆塔微型桩基础的设计方法研究[J].工业建筑, 2005, 35(增):532－536. [11] DBJ 08－4094地基处理技术规范[S]. [12] 宰金珉, 宰金璋.高层建筑基础分析于设计[M].北京:中国建筑工业出版社, 1993. [13] 刘金砺.桩基础设计与计算[M].北京:中国建筑工业出版社, 1990 -
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