EXPERIMENTAL STUDY ON A NOVEL PILE WITH NEGATIVE FRICTIONAL RESISTANCE-REDUCED ACTIVELY IN COLLAPSIBLE LOESS FOUNDATION
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摘要: 针对黄土地区因湿陷而产生的桩侧负摩阻力问题,设计了油毡包裹和套钢管隔离两种主动减小桩侧负摩阻力的方法,并对其进行室内模型验证试验,对比分析基桩在土体浸水前及土体浸水条件下的荷载传递规律及侧摩阻力发挥情况。试验结果表明:在浸水条件下,采用套管桩可有效隔离湿陷引起的桩侧负摩阻力;裹油毡形式桩可一定程度降低基桩负摩阻力。Abstract: Be aimed at negative frictional resistance on the pile sides caused by collapsing in collapsible loess zones, two kinds of methods to reduce negative frictional resistauce were designed, which were to wrap piles with linoleum or with steel casing pipes. The model tests were conducted to contrast the laws of load transfer for the two novel piles in collapsible loess before and after immersion. The test results showed that in the condition of immersion, the piles wrapped with steel casing pipes could efficiently reduce negative friction resistance caused by collapsing; the piles wrapped with linoleum could reduce negative friction resistance of piles to a certain extent.
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Key words:
- collapsible loess /
- negative friction /
- model test
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[1] JOHANNESSEN I J, BJERRUM L. Measurement of Compression of a Steel Pile to Rock due to Settlement of the Surrounding Clay[C]//Proceedings of 6th International Conference of Soil Mechanics and Foundation Engineering.1965:261-264. [2] 李光熠, 汪冰.钢管桩负摩阻力及水平位移的测定[J]. 岩土力学, 1988, 9(2):89-97. [3] 张献辉, 高永贵.自重湿陷性黄土中大直径桩荷载传递机理试验研究[J]. 西安建筑科技大学学报, 1996, 28(4):467-471. [4] 施建勇, 赵维炳, 周春儿.钢桩负摩阻力分析[J]. 岩土工程学报, 1995, 17(2):54-59. [5] 夏力农, 王星华, 蒋春平.桩顶荷载对桩基负摩阻力的影响[J]. 防灾减灾工程学报, 2005, 25(4):359-362. [6] 张厚先.湿陷性黄土地基大直径单桩负摩阻力计算的试验研究[J]. 施工技术, 1994(9):36-38. [7] 陈福全, 龚晓南, 马时冬.桩的负摩阻力现场试验及三维有限元分析[J]. 建筑结构学报, 2000(3):77-80. [8] 黄雪峰, 陈正汉, 哈双, 等.大厚度自重湿陷性黄土中灌注桩承载性状与负摩阻力的试验研究[J]. 岩土工程学报, 2007(3):338-346. [9] 中华人民共和国建设部.湿陷性黄土地区建筑规范:GB 50025-2004[S].北京:中国建筑工业出版社, 2004. [10] 冯忠居, 胡海波, 董芸秀, 等.削减桩基负摩阻力的室内模拟试验[J]. 岩土工程学报, 2019, 41(增刊2):45-48. [11] 高登辉. 大厚度自重湿陷性黄土增湿变形特性及桩基负摩阻力研究[D].北京:中国水利水电科学研究院, 2019. [12] 陈天镭, 王兆辉.消除胀缩土层摩擦力的预制桩:ZL 201822157829.9[P].2019-10-25. [13] 王兆辉, 陈天镭.消除胀缩土层摩擦力的灌注桩:ZL 201822157820.8[P].2019-11-08. [14] 陈天镭, 王兆辉.消除胀缩土层摩擦力的套管预制桩:ZL 201822159386.7[P].2019-11-08. [15] 张延杰, 王旭, 梁庆国, 等.湿陷性黄土模型试验相似材料的研制[J]. 岩石力学与工程学报, 2013, 32(增刊2):4019-4024. [16] 黄雪峰, 孔洋, 李旭东, 等.压实黄土变形特性研究与应用[J]. 岩土力学, 2014, 35(增刊2):37-44. [17] 中华人民共和国住房和城乡建设部.建筑基桩检测技术规范:JGJ 106-2014[S].北京:中国建筑工业出版社, 2014. [18] 中华人民共和国城乡和住房建设部.湿陷性黄土地区建筑标准:GB 50025-2018[S].北京:中国建筑工业出版社, 2018. [19] 黄雪峰, 杨校辉, 殷鹤, 等.湿陷性黄土场地湿陷下陷深度与桩基中性点位置关系研究[J]. 岩土力学, 2015, 36(增刊2):296-302.
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