双排桩基悬臂式挡土墙结构计算方法研究
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摘要
基于双排桩基悬臂式挡土墙结构与传统支挡结构存在较大的差异性,通过探讨双排桩基悬臂式挡土墙结构的承载机理,提出该结构的简化分析模型以及结构内力与变形的解析计算方法,并通过典型工程的有限元建模计算,验证该计算方法的可行性。研究结果表明:双排桩基悬臂式挡土墙结构可分解为悬臂段、底板与桩基,依次采用悬臂梁模型、简支梁模型与弹性地基梁模型进行设计计算;悬臂段承受填筑体水平土压力荷载;底板承受悬臂段传递的重力、水平力与弯矩,以及上部填筑体的竖向均布土压力荷载;桩基承受荷段受水平土压力,锚固段承受由变形引起的弹性抗力;悬臂段底部、底板纵向跨中断面、底板与桩基连接处以及桩基顶部与锚固点附近为应力集中断面,设计时应注意截面安全检算;理论计算结果略大于数值计算结果,验证了该计算方法的合理性,为结构优化设计提供了思路。
There was significant differences between the double-row pile foundation cantilever retaining wall and the traditional retaining structure. And the bearing capacity and deformation behaviors of double-row pile foundation cantilever retaining wall are more complex. A simplified analysis model and the calculation method were proposed based on the bearing mechanism of the double-row pile foundation cantilever retaining wall. The reliability of theoretical calculation method was verified by contrasting the results of finite element calculation.The results show that: The structure of double-row pile cantilever retaining wall was decomposed into cantilever section, bottom plate and pile foundation, with the cantilever beam model, simply supported beam model and elastic foundation beam model were used to design and calculate. Cantilever section subjected to horizontal soil pressure load of the filling body; The gravity, horizontal force and moment of cantilever, and vertical uniform earth pressure acting on the floor; The load of the loaded section is the horizontal earth pressure, and the loaded of the anchorage section is subjected to elastic resistance caused by deformation. The structure design should pay attention to the bottom plate and the bottom plate and the pile cantilever joints, joints, pile and pile anchor point safety inspection section calculation. The theoretical calculation results are slightly larger than the numerical results, and the rationality of the calculation method is verified, besides the new thought about structural optimization design was proposed.
There was significant differences between the double-row pile foundation cantilever retaining wall and the traditional retaining structure. And the bearing capacity and deformation behaviors of double-row pile foundation cantilever retaining wall are more complex. A simplified analysis model and the calculation method were proposed based on the bearing mechanism of the double-row pile foundation cantilever retaining wall. The reliability of theoretical calculation method was verified by contrasting the results of finite element calculation.The results show that: The structure of double-row pile cantilever retaining wall was decomposed into cantilever section, bottom plate and pile foundation, with the cantilever beam model, simply supported beam model and elastic foundation beam model were used to design and calculate. Cantilever section subjected to horizontal soil pressure load of the filling body; The gravity, horizontal force and moment of cantilever, and vertical uniform earth pressure acting on the floor; The load of the loaded section is the horizontal earth pressure, and the loaded of the anchorage section is subjected to elastic resistance caused by deformation. The structure design should pay attention to the bottom plate and the bottom plate and the pile cantilever joints, joints, pile and pile anchor point safety inspection section calculation. The theoretical calculation results are slightly larger than the numerical results, and the rationality of the calculation method is verified, besides the new thought about structural optimization design was proposed.
引文
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[2]姚裕春,李安洪,苏谦.陡坡椅式桩板结构受力模式及计算方法分析[J].铁道工程学报, 2016, 33(8):71-76.YAO Yuchun, LI Anhong, SU qian. Analysis of force model and calculation method of chair-shaped sheet-pile structure constructed on steep slop[J]. Journal of Railway Engineering Society, 2016, 33(8):71-76.
[3]周珩.桩基悬臂式新型支挡结构受力机理与设计计算[D].成都:西南交通大学, 2013.ZHOU Heng. Study on mechanical behavior and design optimization of new piles foundation cantilever retaining structure on the slope[D]. Chengdu:Southwest Jiaotong University, 2013.
[4] Martin G R, CHEN C Y. Response of piles due to lateral slope movement[J]. Computers&Structures, 2005,83(8-9):588-598.
[5]赵明华,尹平保,杨明辉,等.高陡斜坡上桥梁桩基受力特性及影响因素分析[J].中南大学学报(自然科学版), 2012, 43(7):2733-2739.ZHAO Minghua, YIN Pingbao, YANG Minghui, et al.Analysis of influence factors and mechanical characteristics of bridge piles in high and steep slopes[J].Journal of Central South University(Science and Technology), 2012, 43(7):2733-2739.
[6]张永杰,李侑军,赵明华,等.高陡斜坡作用下群桩基础设计计算方法[J].中国公路学报, 2014, 27(10):84-92.ZHANG Yongjie, LI Youjun, ZHAO Minghua, et al.Design and calculation method for pile group foundation in high and steep slop[J]. China Journal of Highway and Transport, 2014, 27(10):84-92.
[7] ZHAO Minghua, LIU Jianhua, LIU Daiquan, et al. Force analysis of pile foundation in rock slope based on upper-bound theorem of limit[J]. Journal of Central South University of Technology, 2008, 15(3):404-410.
[8] Reese L C. Analysis of laterally loaded piles in weak rock[J]. Journal of Geotechniacl and Geonvironmental Engineering,1997, 123(11):1010-1017.
[9]刘国楠,胡荣华,潘效鸿,等.衡重式桩板挡墙受力特性模型试验研究[J].岩土工程学报, 2013, 35(1):103-110.LIU Guonan, HU Ronghua, PAN Xiaohong, et al. Model tests on mechanical behaviors of sheet pile wall with relieving platform[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(1):103-110.
[10]周翠英,刘祚秋,尚伟,等.门架式双排抗滑桩设计计算新模式[J].岩土力学, 2005, 26(3):441-444.ZHOU Cuiying, LIU Zuoqiu, SHANG Wei, et al. A new mode for calculation of portal double row anti-sliding piles[J]. Rock and Soil Mechanics, 2005, 26(3):441-444.
[11] Georgiadis K, Georgiadis M. Development of p-y curves for undrained response of piles near slopes[J]. Computers and Geotechnics, 2012, 40(3):53-61.
[12]赵明华.桥梁桩基计算与检测[M].北京.人民交通出版社, 2000.ZHAO Minghua. Calculation and test of bridge pile foundation[M]. Beijing:China Communications Press,2000.
[13]李海光.新型支挡结构设计与工程实例[M]. 2版.北京:人民交通出版社, 2011.LI Haiguang, Design and engineering example of new type of retaining structure[M]. 2nd ed. Beijing:China Communications Press, 2011.
[2]姚裕春,李安洪,苏谦.陡坡椅式桩板结构受力模式及计算方法分析[J].铁道工程学报, 2016, 33(8):71-76.YAO Yuchun, LI Anhong, SU qian. Analysis of force model and calculation method of chair-shaped sheet-pile structure constructed on steep slop[J]. Journal of Railway Engineering Society, 2016, 33(8):71-76.
[3]周珩.桩基悬臂式新型支挡结构受力机理与设计计算[D].成都:西南交通大学, 2013.ZHOU Heng. Study on mechanical behavior and design optimization of new piles foundation cantilever retaining structure on the slope[D]. Chengdu:Southwest Jiaotong University, 2013.
[4] Martin G R, CHEN C Y. Response of piles due to lateral slope movement[J]. Computers&Structures, 2005,83(8-9):588-598.
[5]赵明华,尹平保,杨明辉,等.高陡斜坡上桥梁桩基受力特性及影响因素分析[J].中南大学学报(自然科学版), 2012, 43(7):2733-2739.ZHAO Minghua, YIN Pingbao, YANG Minghui, et al.Analysis of influence factors and mechanical characteristics of bridge piles in high and steep slopes[J].Journal of Central South University(Science and Technology), 2012, 43(7):2733-2739.
[6]张永杰,李侑军,赵明华,等.高陡斜坡作用下群桩基础设计计算方法[J].中国公路学报, 2014, 27(10):84-92.ZHANG Yongjie, LI Youjun, ZHAO Minghua, et al.Design and calculation method for pile group foundation in high and steep slop[J]. China Journal of Highway and Transport, 2014, 27(10):84-92.
[7] ZHAO Minghua, LIU Jianhua, LIU Daiquan, et al. Force analysis of pile foundation in rock slope based on upper-bound theorem of limit[J]. Journal of Central South University of Technology, 2008, 15(3):404-410.
[8] Reese L C. Analysis of laterally loaded piles in weak rock[J]. Journal of Geotechniacl and Geonvironmental Engineering,1997, 123(11):1010-1017.
[9]刘国楠,胡荣华,潘效鸿,等.衡重式桩板挡墙受力特性模型试验研究[J].岩土工程学报, 2013, 35(1):103-110.LIU Guonan, HU Ronghua, PAN Xiaohong, et al. Model tests on mechanical behaviors of sheet pile wall with relieving platform[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(1):103-110.
[10]周翠英,刘祚秋,尚伟,等.门架式双排抗滑桩设计计算新模式[J].岩土力学, 2005, 26(3):441-444.ZHOU Cuiying, LIU Zuoqiu, SHANG Wei, et al. A new mode for calculation of portal double row anti-sliding piles[J]. Rock and Soil Mechanics, 2005, 26(3):441-444.
[11] Georgiadis K, Georgiadis M. Development of p-y curves for undrained response of piles near slopes[J]. Computers and Geotechnics, 2012, 40(3):53-61.
[12]赵明华.桥梁桩基计算与检测[M].北京.人民交通出版社, 2000.ZHAO Minghua. Calculation and test of bridge pile foundation[M]. Beijing:China Communications Press,2000.
[13]李海光.新型支挡结构设计与工程实例[M]. 2版.北京:人民交通出版社, 2011.LI Haiguang, Design and engineering example of new type of retaining structure[M]. 2nd ed. Beijing:China Communications Press, 2011.