落石冲击下无回填土拱形明洞结构可靠度设计

王玉锁; 徐铭; 王涛; 王志龙; 何俊男; 周良

doi:10.3969/j.issn.0258-2724.2017.06.009

落石冲击下无回填土拱形明洞结构可靠度设计

doi: 10.3969/j.issn.0258-2724.2017.06.009

基金项目:

四川省科技计划资助项目（2013GZ0047）

详细信息

作者简介:
王玉锁(1974-),男,副教授,博士,研究方向为隧道及地下工程结构,电话:13541958693,E-mail:wangysuo@home.swjtu.edu.cn

计量
- 文章访问数: 561
- HTML全文浏览量: 81
- PDF下载量: 55
- 被引次数: 0
出版历程
- 收稿日期: 2017-06-23
- 刊出日期: 2017-12-25

Structural Reliability Design of Non-Backfilling Arch Open Tunnel Structure under Rock-fall Impaction

摘要

摘要: 为完善拱形明洞结构可靠性设计方法，利用模型试验、数值模拟及理论分析等，结合现场实际，开展了落石冲击下无回填土拱形明洞破坏特征及失效模式、极限承载力、落石冲击荷载及极限状态表达式等的研究.首先，根据落石冲击下无回填土拱形明洞结构失效破坏特征，将结构局部失效范围部分简化为四边固支方形钢筋混凝土板结构，利用塑性极限原理按刚塑性板进行准静态极限荷载计算，得到结构极限承载力即抗力；其次，将离散元颗粒流数值模拟方法得到的落石冲击力最大峰值作为钢筋混凝土板顶部落石冲击力，通过回归分析，得到用落石重力势能的幂函数表示的落石冲击荷载表达式；再次，将得到的结构抗力与落石冲击荷载联立得到极限状态方程，利用MABLAB软件编程求得结构可靠指标，通过与目标可靠指标的比较，进行结构可靠度设计与优化；最后，利用所建立的结构可靠度设计方法，对某客专双线拱形明洞设计进行了可靠度检算.研究结果表明：当落石高度为5~15 m、落石重量为1~2 kN时，原设计明洞结构可靠指标可达到4.2；当将原设计的C35混凝土调整为C40，钢筋由HRB335调整为HRB500后，落石高度为5~20 m、落石重量为1~2 kN范围时的结构可靠指标可达到5.4以上.
- 落石冲击 /
- 拱形明洞 /
- 塑性极限原理 /
- 刚塑性板 /
- 结构可靠指标
Abstract: A structural reliability design method for a non-backfilling arch open tunnel structure under rockfall impaction was investigated to improve the reliability of structural design. Firstly, in view of the characteristics of the failure modes of a non-backfilling arch open tunnel under rockfall impaction, a four-fixed square reinforced concrete slab was simplified to a rigid perfectly-plastic slab, and the assumed failure of the structure's ultimate load or structural resistance was calculated as a statics problem using plastic limit theory. Secondly, numerical modelling was performed using a particle flow code method, and rockfall impaction load was expressed as a power function of the gravitational potential energy of rockfall through the regression analysis of modelling results. Thirdly, the limit state equation was established by combining structural resistance and the rockfall impaction load expression. Then, the structural reliability index was obtained using a MATLAB software programming method, and structure reliability design and optimization were performed by comparing the calculated structural reliability index with the target reliability index. Finally, using the established method, the structural reliability indexes of the double-line arch open tunnel of a passenger transport line were analysed. The structural reliability index of the original structure design is up to 4.2 for a height of 5-15 m and a rockfall weight of 1-2 kN. Moreover, the structural reliability index is up to 5.4 if the concrete grade is adjusted from the original C35 to C40 and the reinforcing steel bar grade is changed from HRB335 to HRB500, for a height of 5-20 m and a rockfall weight of 1-2 kN.
- rockfall impaction /
- arch open tunnel /
- plastic limit theory /
- rigid plastic slab /
- structural reliability index

HTML全文

参考文献(23)

史先伟. 客运专线高陡边坡洞门及缓冲结构设计[J]. 铁道建筑技术,2012(5):91-95. SHI Xianwei. Design of tunnel portal and tunnel hood with high-steep slope for passenger dedicated line[J]. Railway Construction Technology, 2012(5):91-95.

黄伦海,蒋树屏,张军. 公路隧道洞口环保型设计施工现状及展望[J]. 地下空间与工程学报,2005,1(3):455-459. HUANG Lunhai, JIANG Shuping, ZHANG Jun. Current status and prospect of environmental design and construction of road tunnel entrance[J]. Chinese Journal of Underground Space and Engineering, 2005, 1(3):455-459.

贾玲利,赵东平. 隧道洞口景观现状及发展趋势研究[J]. 土木工程学报,2008,41(1):88-92. JIA Lingli, ZHAO Dongping. A study on the trend of development and present state of tunnel entrance landscaping[J]. China Civil Engineering Journal, 2008, 41(1):88-92.

黄亚平,陈兰兰. 陕西多地秋雨连绵, 西汉高速山石滚落堵了隧道[N]. 西安晚报,2011-9-14.

WANG Yusuo, TANG Jianhui, YAN Tao, et al. Model test investigation of rock-fall impaction to cut-and-cover tunnel arch structure[J]. Applied Mechanics and Materials, 2011, 90-93:2492-2499.

王玉锁,周良,李正辉, 等. 落石冲击下单压式拱形明洞的力学响应[J]. 西南交通大学学报,2017,52(3):505-515. WANG Yusuo, ZHOU Liang, LI Zhenghui, et al. Mechanical responses of single-pressure arch-shaped open tunnel structure under rockfall impaction[J]. Journal of Southwest Jiaotong University, 2017, 52(3):505-515.

中铁二院工程集团有限责任公司. Q/CR 9129-2015铁路隧道极限状态法设计暂行规范[S]. 北京:中国铁道出版社,2015.

李乔,赵世春. 汶川大地震工程震害分析[M]. 成都:西南交通大学出版社,2008:203.

曹志远. 板壳振动理论[M]. 北京:中国铁道出版社,1989:317.

咸玉席. 弹丸撞击下钢筋混凝土结构的安全计算与评估[D]. 合肥:中国科学技术大学,2014.

余同希,邱信明. 冲击动力学[M]. 北京:清华大学出版社, 2011:41.

LIU Bin, SOARES C G. Plastic response and failure of rectangular cross-section tubes subjected to transverse quasi-static and low-velocity impact loads[J]. International Journal of Mechanical Sciences, 2015, 90:213-227.

FAMIYESIN O O R, HOSSAIN K M A, CHIA Y H, et al. Numerical and analytical predictions of the limit load of rectangular two way slabs[J]. Computers and Structures, 2001,79(1):43-52.

余波. 基于塑性极限分析理论的体系可靠度分析[D]. 南宁:广西大学,2007.

王玉锁,李俊杰,李正辉,等. 落石冲击力评定的离散元颗粒流数值模拟研究[J]. 西南交通大学学报,2016,51(1):22-29. WANG Yusuo, LI Junjie, LI Zhenghui, et al. Assessment of rockfall impact force by particle flow code numerical simulation based on discrete element model[J]. Journal of Southwest Jiaotong University, 2016, 51(1):22-29.

中华人民共和国铁道部. GB50216-94铁路工程结构可靠度设计统一标准[S]. 北京:中国计划出版社,1995.

赵国藩,金伟良,贡金鑫. 结构可靠度理论[M]. 北京:中国建筑工业出版社,2000:31-42.

张明. 结构可靠度分析-方法与程序[M]. 北京:科学出版社,2009:26-44.

中铁二院工程集团有限责任公司. 新建铁路长沙至昆明客运专线玉屏至昆明段变更设计施工图[R]. 贵阳:中铁二院工程集团有限责任公司沪昆铁路客运专线项目部,2014.

中华人民共和国住房和城乡建设部. GB50010-2010混凝土结构设计规范[S]. 北京:中国建筑工业出版社,2010.

赵东平,喻渝,赵万强,等. 铁路隧道衬砌目标可靠指标研究[J]. 铁道工程学报,2015,32(6):51-56. ZHAO Dongping, YU Yu, ZHAO Wanqiang, et al. Research on the target reliability index of railway tunnel lining[J]. Journal of Railway Engineering Society, 2015, 32(6):51-56.

张晓静.铁路隧道复合式衬砌目标可靠指标及分项系数研究[D]. 石家庄:石家庄铁道大学,2014.

中国铁路总公司. Q/CR9007-2014铁路工程结构可靠性设计统一标准(试行)[S]. 北京:中国铁道出版社, 2014.

施引文献

附加材料(0)

访问统计