嵌岩桩抗拔特性现场试验研究
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摘要
依托国家电网路平—富乐500 k V双回线路工程中嵌岩抗拔桩极限载荷试验,针对其中3根等截面抗拔桩,对其上拔荷载-桩顶位移关系,桩身轴力及桩身侧阻力等特性进行了分析。结果表明:在本试验研究范围内,相同的岩土层中,增加桩长,可以显著提高抗拔桩的极限承载力,减小桩身位移。岩性是影响抗拔桩极限承载力的重要因素,相同厚度各岩土层提供抗拔力的能力比(即各岩土层的桩侧阻力之比)为土层∶强风化砂岩∶中风化砂岩=1∶3.8∶9.3;随着嵌入中风化砂岩深度的增加,抗拔桩极限承载力呈近线性增加。
The engineering background of this paper is the rock-socketed pile in the national network Luping-Fule500 kV double-circuit line project. A field test study on the uplift capacities of three same-cross-section piles is conducted.The relationship between the uplift load and the pile top displacement,the axial force,and the lateral resistance of the pile are analyzed.The results show that the increase of the pile length within the same rock layer may significantly increase the ultimate bearing capacity of rock-socketed piles and decrease the pile displacement.Lithology is an important factor affecting the ultimate bearing capacity of uplift pile.In this test,the capacity ratio of each rock layer of the same thickness is 1 ∶ 3. 8 ∶ 9. 3 in terms of the average anti-pull forces of soil,strongly weathered sandstone,and Meso-weathered sandstone.With the increase of the pile depth in Meso-weathered sandstone,the ultimate bearing capacity of the anti-pull piles linearly increases.
The engineering background of this paper is the rock-socketed pile in the national network Luping-Fule500 kV double-circuit line project. A field test study on the uplift capacities of three same-cross-section piles is conducted.The relationship between the uplift load and the pile top displacement,the axial force,and the lateral resistance of the pile are analyzed.The results show that the increase of the pile length within the same rock layer may significantly increase the ultimate bearing capacity of rock-socketed piles and decrease the pile displacement.Lithology is an important factor affecting the ultimate bearing capacity of uplift pile.In this test,the capacity ratio of each rock layer of the same thickness is 1 ∶ 3. 8 ∶ 9. 3 in terms of the average anti-pull forces of soil,strongly weathered sandstone,and Meso-weathered sandstone.With the increase of the pile depth in Meso-weathered sandstone,the ultimate bearing capacity of the anti-pull piles linearly increases.
引文
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[15]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.
[16]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.
[17]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.
[18]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):333-337.
[19]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.
[20]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.
[21]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.
[22]WU X X,YU Z Q,YUAN W Z.Uplift Pile Test in Rocks and Its Bearing Capacity[J].Journal of Southwest Jiaotong University,2002,10(1):84-89.
[23]董金荣.大直径灌注桩抗拔承载性状分析[J].岩土工程学报,2009,31(2):254-258.
[2]MEYERHOF G G,ADAMS J I.The Ultimate Uplift Capacity of Foundations[J].Canadian Geotechnical Journal,1968,5(4):225-244.
[3]DAS B M.A Procedure for Estimation of Uplift Capacity of Rough Piles[J].Soils and Foundations,2008,23(3):122-126.
[4]SHANKER K,BASUDHAR P K,PATRA N R.Uplift Capacity of Single Piles:Prediction and Performance[J].Geotechnical and Geological Engineering,2007,25(2):151-161.
[5]SU Q,ZHANG X X,YIN P B,et al.Ultimate Capacity Analysis and Determination of the Position of Failure Surface for Uplift Piles[J].Mathematical Problems in Engineering,2014(2):1-6.
[6]张继红,朱合华.抗拔桩极限平衡方程及其应用[J].岩土力学,2015,36(8):2339-2344.
[7]NAZIR R,MOAYEDI H,PRATIKSO A,et al.The Uplift Load Capacity of an Enlarged Base Pier Embedded in Dry Sand[J].Arabiam Journal of Geosciences,2015,8(9):7285-7296.
[8]GAAVER K E.Uplift Capacity of Single Piles and Pile Groups Embedded in Cohesionless Soil[J].Alexandria Engineering Journal,2013,52(3):365–372.
[9]FAIZI K,ARMAGHANI D J,SOHAEI H,et al.Deformation Model of Sand Around Short Piles Under Pullout Test[J].Measurement,2015,63:110-119.
[10]ZHANG Z M,ZHANG Q Q,YU Y.A Destructive Field Study on the Behavior of Piles Under Tension and Compression[J].Journal of Zhejiang University—SCIENCE A,2011,12(4):291-300.
[11]曹兆虎,孔纲强,周航,等.基于透明土材料的异形桩拔桩过程对比模型试验[J].铁道科学与工程学报,2014,11(3):71-76.
[12]奚笑舟,陈龙珠.抗拔桩荷载─位移曲线的荷载传递法解析[J].铁道建筑,2011,51(7):84-87.
[13]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.
[14]郭建光,陈伟,陈晓斌.不同荷载方向下土压力对桩土摩阻力的影响[J].铁道科学与工程学报,2009,6(6):39-43.
[15]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.
[16]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.
[17]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.
[18]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):333-337.
[19]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.
[20]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.
[21]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.
[22]WU X X,YU Z Q,YUAN W Z.Uplift Pile Test in Rocks and Its Bearing Capacity[J].Journal of Southwest Jiaotong University,2002,10(1):84-89.
[23]董金荣.大直径灌注桩抗拔承载性状分析[J].岩土工程学报,2009,31(2):254-258.