微型抗滑桩极限抗弯承载力试验研究
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摘要
对桩心配筋桩、钢管+桩心配筋桩和钢管+H型钢桩共27根试件进行极限抗弯承载力试验,发现桩心配筋桩极限抗弯承载力较低且为脆性破坏,钢管+桩心配筋桩和钢管+H型钢桩表现出较高的极限抗弯承载力和延性性能。对桩心配筋桩、钢管+桩心配筋桩和钢管+H型钢桩荷载位移曲线进行分析,将桩心配筋桩受荷分为试件咬合阶段、弹性阶段、弹塑性阶段和破坏阶段,将钢管+桩心配筋桩和钢管+H型钢桩分为试件咬合阶段、弹性阶段、弹塑性阶段和强化阶段。钢管+桩心配筋桩极限抗弯承载力计算可用钢管混凝土桩极限抗弯承载力乘以1.2的提高系数计算。
The ultimate flexural bearing capacity test was carried out through a total of 27 root specimen of the heart reinforcement pile,the steel pipe + heart reinforcement pile,the steel pipe + H section steel pile.It wasfound that the heart reinforcement pile ultimate flexural bearing capacity is low and that the failure was of brittle type,while the steel pipe+ heart reinforcement pile and the steel pipe+ H section steel pile show a higher bearing capacity and was of better ductility performance.Through the loaddisplacement curve,the heart reinforcement ile under loading is divided into specimen bite stage,elastic stage,elastic-plastic stage and failure stage,while the steel pipe+ heart reinforcement pile and the steel pipe+ H section steel pile can be divided into specimen bite stage,elastic stage,elastic-plastic stage and strengthening stage.The ultimate flexural bearing capacity for steel pipe+ heart reinforcement pile can be regarded as that of steel pipe concrete pile multiplied by an increase coefficient of 1.2.
The ultimate flexural bearing capacity test was carried out through a total of 27 root specimen of the heart reinforcement pile,the steel pipe + heart reinforcement pile,the steel pipe + H section steel pile.It wasfound that the heart reinforcement pile ultimate flexural bearing capacity is low and that the failure was of brittle type,while the steel pipe+ heart reinforcement pile and the steel pipe+ H section steel pile show a higher bearing capacity and was of better ductility performance.Through the loaddisplacement curve,the heart reinforcement ile under loading is divided into specimen bite stage,elastic stage,elastic-plastic stage and failure stage,while the steel pipe+ heart reinforcement pile and the steel pipe+ H section steel pile can be divided into specimen bite stage,elastic stage,elastic-plastic stage and strengthening stage.The ultimate flexural bearing capacity for steel pipe+ heart reinforcement pile can be regarded as that of steel pipe concrete pile multiplied by an increase coefficient of 1.2.
引文
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[16]闫金凯，殷跃平，门玉明．微型桩单桩加固滑坡体的模型试验研究[J]．工程地质学报，2009,17(5):669-674.YAN J K,YIN Y P,MEN Y M.Model test study on landslide reinforcement with single micropile[J].Journal of Engineering Geology,2009,17(5):669-674.(in Chinese)
[2]陈再谦，郭果，郭维祥，等．微型钢管抗滑桩的受力特点及其应用[J]．兰州大学学报（自然科学版），2017,53(1):43-47.CHEN Z Q,GUO G,GUO W X,et al.Stress characteristics and application of micro steel anti-slide piles[J].Journal of Lanzhou University:Natural Science,2017,53(1):43-47.(in Chinese)
[3]辛建平，唐晓松，郑颖人，等．单排与三排微型抗滑桩大型模型试验研究[J]．岩土力学，2015,36(04):1050-1056.XIN J P,TANG X S,ZHENG Y R,et al.Large-scale model tests of single-row and triple-row anti-slide micropiles[J].Rock and Soil Mechanics,2015,36(4):1050-1056(in Chinese)
[4]张丹丹，刘小丽，黄敏，等．微型群桩加固岩石滑坡受力特性的有限元分析[J]．工程地质学报，2011,19（增刊）：502-507.ZHANG D D,LIU X L,HUANG M,et al.Finite element analysis on mechanical characteristics of micropile group for rock slide reinforcement[J].Journal of Engineering Geology,2011,19(Sup):502-507.(in Chinese)
[5]CHIARA C M,FFANCESCA D,SANDRO C,et al.Full-scale experimental assessment of the dynamic horizontal behavior of micropiles in alluvial silty soils[J].Soil Dynamics and Earthquake Engineering,2018,113(5):58-74.
[6]DONG J,WU Z H,LI X,et al.Dynamic response and pile-soil interaction of a heavy-haul railway embankment slope reinforced by micro-piles[J].Computers and Geotechnics,2018,100(8):144-157.
[7]JANG Y E,HAN J T.Field study on axial bearing capacity and load transfer characteristic of waveform micropile[J].Canadian Geotechnical Journal,2018,55(5):653-665.
[8]李征．微型钢管桩边坡加固技术及其应用的研究[D]．长沙：湖南大学，2011.LI Z.Research on technique and application of mini steel-tube piles in landslide treatment[D].Changsha:Hunan University,2011.(in Chinese)
[9]闫金凯，殷跃平，马娟．滑坡防治独立微型桩性状的大型物理模型试验研究[J]．水文地质工程地质，2012,39(4):55-60.YAN J K,YIN Y P,MA JUAN.Large scale model test study on single micropile in landslide reinforcement[J].Hydrogeology&Engineering Geology,2012,39(4):55-60.(in Chinese)
[10]闫金凯，殷跃平，门玉明，等．滑坡微型桩群桩加固工程模型试验研究[J]．土木工程学报，2011,44(4):120-128.YAN J K,YIN Y P,MEN Y M,et al.Model test study of landslide reinforcement with micropile groups[J].China Civil Engineering Journal,2011,44(4):120-128.(in Chinese)
[11]刘晓，王连广，李敏．钢管钢骨混凝土柱压弯性能试验研究[J]．工业建筑，2012,42(12):86-90.LIU X,WANG G L,LI M.Experimental research on steel tube columns filled with steel-reinforced concrete subjected to compression-flexure loading[J].Industrial Construction,2012,42(12):86-90.(in Chinese)
[12]刘晓，李敏，王连广．钢管钢骨高强混凝土压弯柱全过程分析[J]．哈尔滨工业大学学报，2012,44(6):121-125.LIU X,LL M,WANG G L.Full-range analysis of steel tube columns filled with steel-reinforced concrete subjected to compression-flexure loading[J].Journal of Harbin Institute of Technology,2012,44(6):121-125.(in Chinese)
[13]刘晓．钢管钢骨高强混凝土组合构件力学性能研究[D]．长春：东北大学，2009.LIU X.Mechanical behaviors study of steel tube filled with steel-reinforced high-strength concrete[D].Changchun:Northeastern University, 2009.(in Chinese)
[14]GUO Z Y,DENG L J.Field behaviour of screw micropiles subjected to axial loading in cohesive soils[J].Canadian Geotechnical Journal,2018,55(1):34-44.
[15]JUSTO E,MANUEL V B,LUIS J J,et al.An elastoplastic model for the analysis of a driven pile extended with a micropile[J]. Computers and Geotechnics,2017,87(1):10-19.
[16]闫金凯，殷跃平，门玉明．微型桩单桩加固滑坡体的模型试验研究[J]．工程地质学报，2009,17(5):669-674.YAN J K,YIN Y P,MEN Y M.Model test study on landslide reinforcement with single micropile[J].Journal of Engineering Geology,2009,17(5):669-674.(in Chinese)