1. Shijiazhuang Tiedao University, Shijiazhuang Hebei, 050043, China;
2. The Key Laboratory for Health Monitoring and Control of Large Structures Hebei province, Shijiazhuang Hebei, 050043, China;
3. Shijiazhuang Highway Engineering Management Department, Shijiazhuang Hebei, 050000, China
Effect of Sand Mining on Bridge Capacity and Safety under the Bridge
CHEN Shu-li1,2, WANG Jian-lei1, XU Hong-wei1, DI Jie3, LI Zhi-ming3
1. Shijiazhuang Tiedao University, Shijiazhuang Hebei, 050043, China;
2. The Key Laboratory for Health Monitoring and Control of Large Structures Hebei province, Shijiazhuang Hebei, 050043, China;
3. Shijiazhuang Highway Engineering Management Department, Shijiazhuang Hebei, 050000, China
摘要Sand excavations at river beds have compromised the safety of several bridges in recent years. An expressway that connects a huge line bridge is selected as the research object in this study.The phenomenon of the excessive digging of river sand under a bridge is considered, and the influence of the development of bridgeson bridge carrying capacity and safety is studied through theoretical analysis, numerical simulation, and field test.Research results show that dredging under the bridge has reduced the bearing capacities of pile tip soil and single pile, but has less effect on the deflection and bending moment of the pier studand the mid-span deflection on the girder. When test vehicles run on the bridge, the increase in the vertical and portrait dynamic displacements of the sand excavation bridge pier top is less than that of the sand bridge pier. Braking will result in a significant increase in dynamic displacement compared with the working car test data. Experimental data on passing cars are considerably larger than those on the traction test vehicle, and passing cars are seriously overloaded. Under the action of test vehicles and passing cars,the dynamic deflection change of the girder mid-span is not evident. Vehicle weight is the main factor that influences the vertical displacement of the pier top.When avehicle brakes, longitudinal braking force is the main factor that influences the portrait displacement of the pier top. Braking on the bridge is highly detrimental.Therefore, measures, such as speed limit, weight limit, and reinforcement,should be taken to avoid water scouring and to ensure the safety of the bridge structure.
Abstract：Sand excavations at river beds have compromised the safety of several bridges in recent years. An expressway that connects a huge line bridge is selected as the research object in this study.The phenomenon of the excessive digging of river sand under a bridge is considered, and the influence of the development of bridgeson bridge carrying capacity and safety is studied through theoretical analysis, numerical simulation, and field test.Research results show that dredging under the bridge has reduced the bearing capacities of pile tip soil and single pile, but has less effect on the deflection and bending moment of the pier studand the mid-span deflection on the girder. When test vehicles run on the bridge, the increase in the vertical and portrait dynamic displacements of the sand excavation bridge pier top is less than that of the sand bridge pier. Braking will result in a significant increase in dynamic displacement compared with the working car test data. Experimental data on passing cars are considerably larger than those on the traction test vehicle, and passing cars are seriously overloaded. Under the action of test vehicles and passing cars,the dynamic deflection change of the girder mid-span is not evident. Vehicle weight is the main factor that influences the vertical displacement of the pier top.When avehicle brakes, longitudinal braking force is the main factor that influences the portrait displacement of the pier top. Braking on the bridge is highly detrimental.Therefore, measures, such as speed limit, weight limit, and reinforcement,should be taken to avoid water scouring and to ensure the safety of the bridge structure.
基金资助:Supported by the Construction Projects on Science and Technology of the Ministry of Transportation (No.2015318814190)
通讯作者:
CHEN Shu-li
E-mail: 13832115905@163.com
引用本文:
陈树礼, 王建雷, 许宏伟, 底杰, 李志明. 桥下采沙对桥梁受力及安全影响研究[J]. Journal of Highway and Transportation Research and Development, 2018, 12(2): 51-58.
CHEN Shu-li, WANG Jian-lei, XU Hong-wei, DI Jie, LI Zhi-ming. Effect of Sand Mining on Bridge Capacity and Safety under the Bridge. Journal of Highway and Transportation Research and Development, 2018, 12(2): 51-58.
[1] JTG D63-007, Code for Design of Ground Base and Foundation of Highway Bridges and Culverts[S]. Beijing, China Communications Press, 2007. (in Chinese)
[2] QI Mei-lan, MENG Guo-qing. Study on the Effect of Sandpits at Riverbed on Bridge Foundation Safety[J]. Journal of Hydrodynamics,2005,20(6):750-754. (in Chinese)
[3] QI Mei-lan. Riverbed Scouring around Bridge Piers in River Section Sand Pits[J]. Journal of Hydraulic Engineering,2005,36(7):835-839. (in Chinese)
[4] LIANG Sen-dong, ZHANG Yong-liang. Analysis on the Local Scour Around Complex Piers of a Sea-crossing Bridge[J]. Journal of Hydraulic Engineering,2011,42(11):1334-1340. (in Chinese)
[5] ZHU Yan-peng, DONG Yun-xiu, BAO Ze-xue. Experimental Study of Bearing Capacity of Single Pile in Large Thickness Q2 Loess Ground[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(2):4375-4383. (in Chinese)
[6] DENG Zhi-yong, LU Pei-yi, WANG Cheng-hua. Reliability Research on Bearing Capacity of Single Bored Pile[J]. Rock and Soil Mechanics, 2003, 24(1):83-88. (in Chinese)
[7] LIU Shan-nan, GAO Cheng-yong, HUANG Shao-ming, et al. Lateral Capacity of Prestressed Piles in Shanghai Soft Soil[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(2):1028-1032. (in Chinese)
[8] ZHAO Ming-qua,LIU En, WANG You. Stability Analysis of Pile Foundation with Higher Pile Column Bridge Piers[J]. Journal of Highway and Transportation Research and Development, 2008,25(7):95-99. (in Chinese)
[9] LI Zhi-yan,DING Zhen-ming.Numerical Simulation of Effect of Bored Cast-in-place Pile Construction on Adjacent Piles[J]. Journal of Highway and Transportation Research and Development, 2013,30(4):70-75,93. (in Chinese)
[10] LI Huai-jian, ZHANG Hong,XU Bin. Dynamic Responses of Single Pile Embedded in Nearly Saturated SoilSubjected to Vertical Load[J]. Journal of Highway and Transportation Research and Development, 2015,32(3):37-45. (in Chinese)
[11] PENG Long-shi,PANG Lin-xiang. Numerical Analysis of Adjacent Bridge Piles Influenced by Surcharge Loads on Soft Foundation[J]. Journal of Highway and Transportation Research and Development, 2014,31(12):67-72. (in Chinese)
[12] WANG Fei, ZHUO Yi. Analysis of Influence of Foundation Pit Excavation on Displacement of Existed Railway Bridge Foundation[J]. Journal of Railway Engineering Society, 2012, (8):28-33. (in Chinese)
[13] LI Wen-ping. Effect of Excavation on Pile Capacity and Engineering Application of β-Method[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(2):259-262. (in Chinese)
[14] CHEN Ming, LI Jing-pei. Metro Project-based Analysis of Excavation Impact on Pile Bearing Capacity[J].Journal of TongJi University:National Science Edition, 2014,42(5):677-682. (in Chinese)
[15] Shijiazhuang Tiedao University. Test Report of Ci-he Bridge on Provincial Highway S232[R]. Shijiazhuang Tiedao University Engineering Test Center, 2015. (in Chinese)
[1]
常柱刚, 王林凯, 夏飞龙. 基于CV NewMark-b法桥梁风致振动FSI数值模拟[J]. Journal of Highway and Transportation Research and Development, 2019, 13(2): 28-37.
2018, Vol. 12 
