螺栓对高轴压盾构管片接头抗弯性能影响研究
|
摘要
在大埋深、高水压等特殊条件下进行盾构隧道管片结构设计时,具有复杂接缝面的管片接头形式得到广泛运用,为具体探究其抗弯性能以及螺栓的作用,采用有限元软件Abaqus,结合具体工程实例,建立大直径盾构隧道管片接头三维非连续接触模型,针对高轴压作用下管片接头的变形特征、抗弯性能和承载能力进行对比分析。计算结果表明:(1)对于大直径盾构隧道管片接头结构,有无螺栓工况之间极限承载弯矩的差值随着轴力的增大而逐渐减小。结构体系失稳前同一弯矩下有无螺栓工况之间的张开量差值随着轴压的减小而逐渐增大;(2)高轴压作用下管片接头接缝面混凝土压溃破坏时螺栓尚未进入屈服阶段,且随着轴力的增加,有无螺栓工况下接头抗弯刚度的相对数值差异显著减小;(3)较之有无螺栓工况,对于高轴压盾构管片接头变形特征和抗弯刚度的影响而言,两种不同等级螺栓的区别不大。总体来说,随着轴压的增加,螺栓对于管片接头的变形控制和抗弯性能提升的贡献逐渐减小。
To design a shield tunnel under special conditions such as large buried depth and high water pressure, segment joints with complex seams are widely used. To study the bending behaviors and functions of bolts, a three-dimensional discon-tinuous contact model is established with the finite element software-Abaqus based on engineering practices. The deformation features, bending behaviors and bearing capacity of segment joints under high axial compression are compared and analyzed. The results show that:(1) The splaying amount of ultimate bearing moment between bolted and non-bolted conditions decreases with the increase of the axial force while the splaying amount of the opening under the same bending moment gradually increases with the decrease of axial pressure;(2) The bolt has not yet entered the yield stage when the concrete of segment joints is crushed, and the splaying amount of flexural rigidity of segment joints decreases significantly between bolted and non-bolted conditions with the increase of axial force;(3) The comparison of cases with and without bolts shows that the splaying amount can be ignored of the two kinds of bolts with different strength level in consideration of the deforming characteristics of segment joints under high axial force and the effect of bending stiffness. As a matter of fact, the deforming control and the contribution to bending resistance towards segment joints offered by the joints gradually become smaller.
To design a shield tunnel under special conditions such as large buried depth and high water pressure, segment joints with complex seams are widely used. To study the bending behaviors and functions of bolts, a three-dimensional discon-tinuous contact model is established with the finite element software-Abaqus based on engineering practices. The deformation features, bending behaviors and bearing capacity of segment joints under high axial compression are compared and analyzed. The results show that:(1) The splaying amount of ultimate bearing moment between bolted and non-bolted conditions decreases with the increase of the axial force while the splaying amount of the opening under the same bending moment gradually increases with the decrease of axial pressure;(2) The bolt has not yet entered the yield stage when the concrete of segment joints is crushed, and the splaying amount of flexural rigidity of segment joints decreases significantly between bolted and non-bolted conditions with the increase of axial force;(3) The comparison of cases with and without bolts shows that the splaying amount can be ignored of the two kinds of bolts with different strength level in consideration of the deforming characteristics of segment joints under high axial force and the effect of bending stiffness. As a matter of fact, the deforming control and the contribution to bending resistance towards segment joints offered by the joints gradually become smaller.
引文
[1] 王梦恕.中国盾构和掘进机隧道技术现状、存在的问题及发展思路[J].隧道建设,2014,34(3):179-187.
[2] 陈馈.琼州海峡隧道超大直径盾构新技术展望[J].隧道建设,2014,34(7):603-607.
[3] 肖明清.国内大直径盾构隧道的设计技术进展[J].铁道标准设计,2008(8):84-87.
[4] 封坤,何川,苏宗贤.南京长江隧道管片衬砌结构原型加载试验[J].中国公路学报,2013,26(1):135-143.
[5] 刘建航,侯学渊.盾构法隧道[M].北京:中国铁道出版社,1991:245-251.
[6] 何川,张建刚,苏宗贤.大断面水下盾构隧道结构力学特性[M].北京:科学出版社,2010.
[7] 郭瑞,何川,封坤,等.大断面水下盾构隧道管片接头抗弯刚度及其对管片内力影响研究[J].中国铁道科学,2013,34(5):46-53.
[8] 何川,封坤,方勇.盾构法修建地铁隧道的技术现状与展望[J].西南交通大学学报,2015,50(1):97-109.
[9] 师永翔,赵武胜.大直径盾构隧道管片接头抗弯性能研究[J].现代隧道技术,2013,50(1):115-122,133.
[10] 刘四进,封坤,何川,等.大断面盾构隧道管片接头抗弯力学模型研究[J].工程力学,2015,32(12):215-224.
[11] 彭益成,丁文其,沈碧伟,等.输水隧道单层衬砌管片接头抗弯力学特性研究[J].地下空间与工程学报,2013,9(05):1065-1069,1108.
[12] 肖明清,姚捷,黄盾,等.广深港高铁狮子洋隧道列车所致环境振动实测研究[J].岩石力学与工程学报,2013,32(S2):3527-3534.
[13] 张厚美,傅德明,过迟.盾构隧道管片接头荷载试验研究[J].现代隧道技术,2002(6):28-3.
[14] 封坤.大断面水下盾构隧道管片衬砌结构的力学行为研究[D].成都:西南交通大学,2012.
[15] 何川,封坤.大型水下盾构隧道结构研究现状与展望[J].西南交通大学学报,2011,46(1):1-11.
[16] 郭瑞,何川,苏宗贤,等.盾构隧道管片接头抗剪力学性能研究[J].现代隧道技术,2011,48(4):72-77.
[17] 欧阳文彪.盾构隧道管片接头受力的精细化三维有限元分析[J].中国市政工程,2014(4):58-61,65,109-110.
[18] 黄宏伟,沈贤达,王飞,等.盾构隧道管片接头的易损性分析和评价[J].同济大学学报(自然科学版),2016,44(2):198-206,219.
[19] 柳献,叶宇航,刘震,等.连接螺栓对类矩形盾构隧道结构极限承载力影响的试验研究与分析[J].土木工程学报,2018,51(8):81-88,95.
[20] 封坤,何川,肖明清.高轴压作用下盾构隧道复杂接缝面管片接头抗弯试验[J].土木工程学报,2016,49(8):99-110,132.
[21] 陈俊生,莫海鸿.盾构隧道管片接头抗弯刚度的三维数值计算[J].铁道学报,2009,31(4):87-91.
[2] 陈馈.琼州海峡隧道超大直径盾构新技术展望[J].隧道建设,2014,34(7):603-607.
[3] 肖明清.国内大直径盾构隧道的设计技术进展[J].铁道标准设计,2008(8):84-87.
[4] 封坤,何川,苏宗贤.南京长江隧道管片衬砌结构原型加载试验[J].中国公路学报,2013,26(1):135-143.
[5] 刘建航,侯学渊.盾构法隧道[M].北京:中国铁道出版社,1991:245-251.
[6] 何川,张建刚,苏宗贤.大断面水下盾构隧道结构力学特性[M].北京:科学出版社,2010.
[7] 郭瑞,何川,封坤,等.大断面水下盾构隧道管片接头抗弯刚度及其对管片内力影响研究[J].中国铁道科学,2013,34(5):46-53.
[8] 何川,封坤,方勇.盾构法修建地铁隧道的技术现状与展望[J].西南交通大学学报,2015,50(1):97-109.
[9] 师永翔,赵武胜.大直径盾构隧道管片接头抗弯性能研究[J].现代隧道技术,2013,50(1):115-122,133.
[10] 刘四进,封坤,何川,等.大断面盾构隧道管片接头抗弯力学模型研究[J].工程力学,2015,32(12):215-224.
[11] 彭益成,丁文其,沈碧伟,等.输水隧道单层衬砌管片接头抗弯力学特性研究[J].地下空间与工程学报,2013,9(05):1065-1069,1108.
[12] 肖明清,姚捷,黄盾,等.广深港高铁狮子洋隧道列车所致环境振动实测研究[J].岩石力学与工程学报,2013,32(S2):3527-3534.
[13] 张厚美,傅德明,过迟.盾构隧道管片接头荷载试验研究[J].现代隧道技术,2002(6):28-3.
[14] 封坤.大断面水下盾构隧道管片衬砌结构的力学行为研究[D].成都:西南交通大学,2012.
[15] 何川,封坤.大型水下盾构隧道结构研究现状与展望[J].西南交通大学学报,2011,46(1):1-11.
[16] 郭瑞,何川,苏宗贤,等.盾构隧道管片接头抗剪力学性能研究[J].现代隧道技术,2011,48(4):72-77.
[17] 欧阳文彪.盾构隧道管片接头受力的精细化三维有限元分析[J].中国市政工程,2014(4):58-61,65,109-110.
[18] 黄宏伟,沈贤达,王飞,等.盾构隧道管片接头的易损性分析和评价[J].同济大学学报(自然科学版),2016,44(2):198-206,219.
[19] 柳献,叶宇航,刘震,等.连接螺栓对类矩形盾构隧道结构极限承载力影响的试验研究与分析[J].土木工程学报,2018,51(8):81-88,95.
[20] 封坤,何川,肖明清.高轴压作用下盾构隧道复杂接缝面管片接头抗弯试验[J].土木工程学报,2016,49(8):99-110,132.
[21] 陈俊生,莫海鸿.盾构隧道管片接头抗弯刚度的三维数值计算[J].铁道学报,2009,31(4):87-91.