圆形与矩形截面抗滑桩抗滑性能的模型试验研究
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摘要
在滑坡治理与边坡防护工程中,圆形截面抗滑桩由于具有便于机械化成桩的施工优势,已被工程广泛应用。然而,与传统的矩形抗滑桩相比,目前对于圆形截面抗滑桩的研究较少,设计和理论体系不够完善,其抗滑效果尚无统一定论。基于圆形截面与矩形截面抗滑桩对比模型试验研究圆形截面与矩形截面抗滑桩的受力变形特征,比较两者的抗滑能力:在满足各试验相似关系的前提下,分别进行无桩空推试验、圆形截面抗滑桩试验和矩形截面抗滑桩试验。观察土体与模型桩受力发生变形的全过程,并对试验结果进行比较。布设土压力盒、钢筋计及百分表,对土压力、钢筋应力、桩顶位移进行监测,分析模型桩的受力特性。研究结果表明,相同条件下圆形截面抗滑桩的受力性能与矩形截面抗滑桩基本一致,受力过程中传力均匀,对桩底嵌固端强度要求低,具有良好的抗滑承载能力,值得在工程实际中推广应用。
In the landslide control and slope protection project, the circular cross-section anti-sliding pile has been widely used in geotechnical engineering practice because of its advantages of mechanized pile construction. However, compared with the traditional rectangular cross-section anti-sliding pile, there is less research on the circular cross-section anti-sliding pile, and the design and theoretical systems are not perfect enough. There is no unified conclusion on anti-sliding effect yet. In this study, the model experiments were conduct to investigate the force and deformation characteristics of circular section and rectangular section anti-slide piles, comparing their anti-slide abilities. On the premise of satisfying the similarity relation of each test, the pile-free push test,circular section anti-sliding piles test and rectangular section anti-sliding piles test were carried out respectively to observe the whole process of the deformation of soil and model piles. The experimental results were compared. Eearth pressure cells, reinforcement stress gauges, and dial indicators were arranged to monitor the earth pressure, reinforcement stress and displacement of pile top. The mechanical characteristics of the model pile were analyzed. The performance of circular cross-section anti-sliding piles is basically the same as that of rectangular cross-section anti-sliding piles under the same conditions. The force transfer is uniform in the process of loading, the requirement for the strength of the fixed end of the pile is low, and the anti-sliding bearing capacity is good. It is worth popularizing and applying in engineering practice.
In the landslide control and slope protection project, the circular cross-section anti-sliding pile has been widely used in geotechnical engineering practice because of its advantages of mechanized pile construction. However, compared with the traditional rectangular cross-section anti-sliding pile, there is less research on the circular cross-section anti-sliding pile, and the design and theoretical systems are not perfect enough. There is no unified conclusion on anti-sliding effect yet. In this study, the model experiments were conduct to investigate the force and deformation characteristics of circular section and rectangular section anti-slide piles, comparing their anti-slide abilities. On the premise of satisfying the similarity relation of each test, the pile-free push test,circular section anti-sliding piles test and rectangular section anti-sliding piles test were carried out respectively to observe the whole process of the deformation of soil and model piles. The experimental results were compared. Eearth pressure cells, reinforcement stress gauges, and dial indicators were arranged to monitor the earth pressure, reinforcement stress and displacement of pile top. The mechanical characteristics of the model pile were analyzed. The performance of circular cross-section anti-sliding piles is basically the same as that of rectangular cross-section anti-sliding piles under the same conditions. The force transfer is uniform in the process of loading, the requirement for the strength of the fixed end of the pile is low, and the anti-sliding bearing capacity is good. It is worth popularizing and applying in engineering practice.
引文
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[4]李乾南,熊宗海.圆截面均匀配筋抗滑桩裂缝控制[J].建筑结构,2013(8):74-77.LI Qian-nan,XIONG Zong-hai.Crack control of reinforced concrete anti-sliding piles with circular section for uniform reinforcing[J].Building Structure,2013(8):74-77.
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[8]周群华.基于桩土相互作用的抗滑桩改进模式三维数值模拟研究[D].天津:天津大学,2014.ZHOU Qun-hua.Researches on 3D numerical simulation of improved module of anti-slide pile types based on pile-soil interaction[D].Tianjin:Tianjin University,2014.
[9]赵明华,陈耀浩,杨超炜.考虑土拱作用抗滑桩合理桩间距确定方法研究[J].岩土工程学报,2015,37(增刊2):17-21.ZHAO Ming-hua,CHEN Yao-hao,YANG Chao-wei.Methods for determining rational spacing between anti-slide piles considering soil arching effects[J].Chinese Journal of Geotechnical Engineering,2015,37(Suppl.2):17-21.
[10]杨建民,司航.考虑土拱效应的圆形抗滑桩滑坡推力的计算[J].工业建筑,2016,46(1):105-110.YANG Jian-min,SI Hang.A calculation method for lateral force acting on circular stabilizing piles considering soil arching effect[J].Industrial Construction,2016,46(1):105-110.
[11]李恒杨,戴自航,卢才金.圆形与矩形截面门架式抗滑桩性能的数值分析对比[J].土工基础,2016,30(3):328-332.LI Heng-yang,DAI Zi-hang,LU Cai-jin.Numerical comparisons of H shaped anti-landslide caissons with circular and rectangular sections[J].Soil Engineering and Foundation,2016,30(3):328-332.
[12]周记名.圆形截面抗滑桩抗滑机理研究[D].成都:西南交通大学,2015.ZHOU Ji-ming.The study on skid resistance mechanism of circular cross section anti-sliding pile group[D].Chengdu:Southwest Jiaotong University,2015.
[13]储召军,石少卿,孙建虎,等.基于模型试验的桩间距对组合式钢管抗滑桩抗滑效果的影响分析[J].岩土力学,2018,39(3):848-862.CHU Zhao-jun,SHI Shao-qing,SUN Jian-hu,et al.Analysis of anti-sliding mechanism of steel tube piles with different spacings based on model test[J].Rock and Soil Mechanics,2018,39(3):848-862.
[14]周维垣,陈兴华,杨若琼,等.高拱坝整体稳定地质力学模型试验研究[J].水力发电学报,2005,24(1):50-57.ZHOU Wei-heng,CHEN Xing-hua,YANG Ruo-qiong,et al.Research on geomechanical model of rupture tests of arch dams for their stability[J].Journal of Hydroelectric Engineering,2005,24(1):50-57.
[15]IAI S.Similitude for shaking table test on soil-structurefluid model in 1g gravitational field[J].Soils and Foundations,1989,29(3):105-118.
[16]欧阳秋焱.圆形抗滑桩在某高速公路滑坡治理中的应用[J].交通科技,2014(4):94-95.OUYANG Qiu-yan.Application of circular anti-slide pile in landslide treatment of a certain highway[J].Transportation Science&Technology,2014(4):94-95.
[17]焦志斌,刘永绣.地下连续墙测试中弯矩的计算方法探讨[J].岩土工程学报,2006,28(增刊1):1485-1488.JIAO Zhi-bin,LIU Yong-xiu.Calculation methods of bending moment in diaphragm wall tests[J].Chinese Journal of Geotechnical Engineering,2006,28(Suppl.1):1485-1488.
[2]王成,唐树名,邓安福.圆截面混凝土桩的抗弯损伤分析[J].工程力学,2000,17(增刊):87-91.WANG Cheng,TANG Shu-ming,DENG An-fu.Analysis of flexural damage of circular cross section concrete piles[J].Engineering Mechanics,2000,17(Suppl.):87-91.
[3]陈富坚,姜宏,韦韬,等.圆截面抗滑桩非均布配筋计算方法[J].桂林理工大学学报,2001,21(4):366-370.CHEN Fu-jian,JIANG Hong,WEI Tao,et al.Computation of non-uniformly distributive reinforcement of retailing piles with round section[J].Journal of Gulin Institute of Technolgoy,2001,21(4):366-370.
[4]李乾南,熊宗海.圆截面均匀配筋抗滑桩裂缝控制[J].建筑结构,2013(8):74-77.LI Qian-nan,XIONG Zong-hai.Crack control of reinforced concrete anti-sliding piles with circular section for uniform reinforcing[J].Building Structure,2013(8):74-77.
[5]中华人民共和国住房和城乡建设部.GB 50010―2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.Ministny of Housing and Urban-Rural Development of the People’s Republic of China.GB 50010―2010 Code for design of concrete structure[S].Beijing:China architecture&building press.2011.
[6]曹平,朱宝龙,陈强,等.微型圆桩加固平面滑坡的桩间距分析[J].西安科技大学学报,2009,29(5):126-130.CAO Ping,ZHU Bao-long,CHEN Qiang,et al.Analysis on the space of circular micro-piles in plannar failure[J].Journal of Xi’an University of Science and Technology,2009,29(5):126-130.
[7]年廷凯,徐海洋,李东晨.不同截面型式抗滑桩加固边坡数值分析[J].大连理工大学学报,2013,53(5):695-701.NIAN Ting-kai,XU Hai-yang,LI Dong-chen.Numerical analysis of slope reinforcement with different cross-section anti-slide piles[J].Journal of Dalian University of Technology,2013,53(5):695-701.
[8]周群华.基于桩土相互作用的抗滑桩改进模式三维数值模拟研究[D].天津:天津大学,2014.ZHOU Qun-hua.Researches on 3D numerical simulation of improved module of anti-slide pile types based on pile-soil interaction[D].Tianjin:Tianjin University,2014.
[9]赵明华,陈耀浩,杨超炜.考虑土拱作用抗滑桩合理桩间距确定方法研究[J].岩土工程学报,2015,37(增刊2):17-21.ZHAO Ming-hua,CHEN Yao-hao,YANG Chao-wei.Methods for determining rational spacing between anti-slide piles considering soil arching effects[J].Chinese Journal of Geotechnical Engineering,2015,37(Suppl.2):17-21.
[10]杨建民,司航.考虑土拱效应的圆形抗滑桩滑坡推力的计算[J].工业建筑,2016,46(1):105-110.YANG Jian-min,SI Hang.A calculation method for lateral force acting on circular stabilizing piles considering soil arching effect[J].Industrial Construction,2016,46(1):105-110.
[11]李恒杨,戴自航,卢才金.圆形与矩形截面门架式抗滑桩性能的数值分析对比[J].土工基础,2016,30(3):328-332.LI Heng-yang,DAI Zi-hang,LU Cai-jin.Numerical comparisons of H shaped anti-landslide caissons with circular and rectangular sections[J].Soil Engineering and Foundation,2016,30(3):328-332.
[12]周记名.圆形截面抗滑桩抗滑机理研究[D].成都:西南交通大学,2015.ZHOU Ji-ming.The study on skid resistance mechanism of circular cross section anti-sliding pile group[D].Chengdu:Southwest Jiaotong University,2015.
[13]储召军,石少卿,孙建虎,等.基于模型试验的桩间距对组合式钢管抗滑桩抗滑效果的影响分析[J].岩土力学,2018,39(3):848-862.CHU Zhao-jun,SHI Shao-qing,SUN Jian-hu,et al.Analysis of anti-sliding mechanism of steel tube piles with different spacings based on model test[J].Rock and Soil Mechanics,2018,39(3):848-862.
[14]周维垣,陈兴华,杨若琼,等.高拱坝整体稳定地质力学模型试验研究[J].水力发电学报,2005,24(1):50-57.ZHOU Wei-heng,CHEN Xing-hua,YANG Ruo-qiong,et al.Research on geomechanical model of rupture tests of arch dams for their stability[J].Journal of Hydroelectric Engineering,2005,24(1):50-57.
[15]IAI S.Similitude for shaking table test on soil-structurefluid model in 1g gravitational field[J].Soils and Foundations,1989,29(3):105-118.
[16]欧阳秋焱.圆形抗滑桩在某高速公路滑坡治理中的应用[J].交通科技,2014(4):94-95.OUYANG Qiu-yan.Application of circular anti-slide pile in landslide treatment of a certain highway[J].Transportation Science&Technology,2014(4):94-95.
[17]焦志斌,刘永绣.地下连续墙测试中弯矩的计算方法探讨[J].岩土工程学报,2006,28(增刊1):1485-1488.JIAO Zhi-bin,LIU Yong-xiu.Calculation methods of bending moment in diaphragm wall tests[J].Chinese Journal of Geotechnical Engineering,2006,28(Suppl.1):1485-1488.