嵌岩桩抗拔承载特性的离心模型试验研究
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摘要
针对目前在抗拔桩设计中对嵌岩桩承载力影响因素理解不足,导致桩基设计不合理的问题,采用离心机模型试验,研究嵌岩深度、岩土体性质和桩型对桩基极限抗拔承载力的影响。研究结果表明:等截面桩极限抗拔承载力随嵌岩深度的增加呈近线性增加,扩底桩极限抗拔承载力呈非线性增加;较软岩与软岩比较,扩底桩极限抗拔承载力增幅超过200%;扩底桩极限抗拔承载力高于等截面桩88.7%～95.2%。
At present, the factors influencing the bearing capacity of rock-socketed piles are not well understood in the design of uplift piles, which leads to the unreasonable design of pile foundations. To solve this problem, centrifuge model test was used to study the influence of rock-socketed depth, rock and soil properties, pile types on ultimate uplift capacity of piles. The results show that the ultimate uplift capacity of even section piles increases linearly with the increase of rock-socketed depth, and the ultimate uplift capacity of belled piles increases nonlinearly. Compared with soft rock and more soft rock, the ultimate uplift capacity of belled piles increases by more than 200%. The ultimate uplift capacity of belled piles is higher than that of even section piles by 88.7%～95.2%.
At present, the factors influencing the bearing capacity of rock-socketed piles are not well understood in the design of uplift piles, which leads to the unreasonable design of pile foundations. To solve this problem, centrifuge model test was used to study the influence of rock-socketed depth, rock and soil properties, pile types on ultimate uplift capacity of piles. The results show that the ultimate uplift capacity of even section piles increases linearly with the increase of rock-socketed depth, and the ultimate uplift capacity of belled piles increases nonlinearly. Compared with soft rock and more soft rock, the ultimate uplift capacity of belled piles increases by more than 200%. The ultimate uplift capacity of belled piles is higher than that of even section piles by 88.7%～95.2%.
引文
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[13]王卫东,吴江斌,王向军,等.桩侧后注浆抗拔桩技术的研究与应用[J].岩土工程学报,2011,33(增2):437-445.WANG Weidong,WU Jiangbing,WANG Xiangjun,et al.Study and application of side-grouting uplift piles[J].Chinese Journal of Geotechnical Engineering,2011,33(Suppl 2):437-445.
[14]万东立,罗玉屏,王保良.嵌岩抗拔桩的试验受力分析[J].石家庄铁道学院学报,2007,20(2):65-68.WAN Dongli,LUO Yuping,WANG Baoliang.Experimental analysis of force on uplift piles in rock mass[J].Journal of Shijiazhuang Railway Institute,2007,20(2):65-68.
[15]吴兴序,于志强,庄卫林.岩层中抗拔桩的承载力计算方法探讨[J].西南交通大学学报,2002,37(2):190-194.WU Xingxu,YU Zhiqiang,ZHUANG Weilin.Discussion on methods for calculating bearing capacity of tension piles set into rock[J].Journal of Southwest Jiaotong University,2002,37(2):190-194.
[16]WU Xingxu,YU Zhiqiang,YUAN Wenzhong.Uplift pile test in rocks and its bearing capacity[J].Journal of Southwest Jiaotong University,2002,10(1):84-89.
[2]Dash B K,Pise P J.Effect of compressive load on uplift capacity of model piles[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(11):987-992.
[3]Gaaver K E.Uplift capacity of single pile and pile groups embedded in cohesionless soil[J].Alex Eng J,2013,52(3):365-372.
[4]Koohyar F,Danial J A,Houman S,et al.Deformation model of sand around short piles under pullout test[J].Measurement,2015(63):110-119.
[5]钱建固,贾鹏,程明进,等.注浆桩土接触面试验研究及后注浆抗拔桩承载特性数值分析[J].岩土力学,2011,32(增1):662-668.QIAN Jiangu,JIA Peng,CHENG Mingjin,et al.Experimental study of grouting pile-soil interface and numerical simulation of bearing behavior of side-grouting uplift pile[J].Rock and Soil Mechanics,2011,32(Suppl1):662-668.
[6]钱建固,马霄,李伟伟,等.桩侧注浆抗拔桩离心模型试验与原位测试分析[J].岩土力学,2014,35(5):1241-1246.QIAN Jiangu,MA Xiao,LI Weiwei,et al.Centrifuge model test and in-site observation on behaviors of side-grouting uplift pile[J].Rock and Soil Mechanics,2014,35(5):1241-1246.
[7]袁文忠,于志强,谢涛.岩基强度对嵌岩抗拔桩承载力影响的试验研究[J].西南交通大学学报,2003,38(2):178-182.YUAN Wenzhong,YU Zhiqiang,XIE Tao.Vertical bearing capacity of rock-socketed piles influenced by batholith strength[J].Journal of Southwest Jiaotong University,2003,38(2):178-182.
[8]刘波,徐薇,胡和涛,等.大直径扩底嵌岩桩抗拔承载性状试验与分析[J].安徽理工大学学报(自然科学版),2015,35(2):1-5.LIU Bo,XU Wei,HU Hetao,et al.Experimental analysis and numerical calculation of large diameter rock socketed uplift pile with belled shaft[J].Journal of Anhui University of Science and Technology(Natural Science),2015,35(2):1-5.
[9]何剑.嵌岩灌注桩抗拔承载性状试验研究[J].岩石力学与工程学报,2004,23(2):315-319.HE Jian.Testing study on anti-draw bearing properties of cast-in-place rock-socketed pile[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(2):315-319.
[10]王耀辉,谭国焕,李启光.模型嵌岩桩试验及数值分析[J].岩石力学与工程学报,2007,26(8):1691-1697.WANG Yaohui,TAN Guohuan,LI Qiguang.Test and numerical analysis of model rock-socketed pile[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1691-1697.
[11]何思明,吴永,李新坡.嵌岩抗拔桩作用机制研究[J].岩土力学,2009,30(2):333-344.HE Siming,WU Yong,LI Xinpo.Research on mechanism of uplift rock-socketed piles[J].Rock and Soil Mechanics,2009,30(2):333-344.
[12]唐孟雄,陈达.基岩内抗拔桩极限承载力的计算方法[J].岩土力学,2015,36(增2):633-638.TANG Mengxiong,CHEN Da.A computational method of ultimate capacity of uplift piles in basement rock[J].Rock and Soil Mechanics,2015,36(Suppl 2):633-638.
[13]王卫东,吴江斌,王向军,等.桩侧后注浆抗拔桩技术的研究与应用[J].岩土工程学报,2011,33(增2):437-445.WANG Weidong,WU Jiangbing,WANG Xiangjun,et al.Study and application of side-grouting uplift piles[J].Chinese Journal of Geotechnical Engineering,2011,33(Suppl 2):437-445.
[14]万东立,罗玉屏,王保良.嵌岩抗拔桩的试验受力分析[J].石家庄铁道学院学报,2007,20(2):65-68.WAN Dongli,LUO Yuping,WANG Baoliang.Experimental analysis of force on uplift piles in rock mass[J].Journal of Shijiazhuang Railway Institute,2007,20(2):65-68.
[15]吴兴序,于志强,庄卫林.岩层中抗拔桩的承载力计算方法探讨[J].西南交通大学学报,2002,37(2):190-194.WU Xingxu,YU Zhiqiang,ZHUANG Weilin.Discussion on methods for calculating bearing capacity of tension piles set into rock[J].Journal of Southwest Jiaotong University,2002,37(2):190-194.
[16]WU Xingxu,YU Zhiqiang,YUAN Wenzhong.Uplift pile test in rocks and its bearing capacity[J].Journal of Southwest Jiaotong University,2002,10(1):84-89.