Analysis on the Influence Factors of the Hydraulic Compactor to Reinforce the Subgrade on the Back of Abutment
潘金楠1, 徐天宇2
1. Architectural & Civil Engineering Design Institute CO., LTD Hangzhou CHINA, Hangzhou Zhejiang 310000, China; 2. College of Architecture and Energy Engineering, Wenzhou University of Technology, Wenzhou Zhejiang 325000, China
Analysis on the Influence Factors of the Hydraulic Compactor to Reinforce the Subgrade on the Back of Abutment
PAN Jin-nan1, XU Tian-yu2
1. Architectural & Civil Engineering Design Institute CO., LTD Hangzhou CHINA, Hangzhou Zhejiang 310000, China; 2. College of Architecture and Energy Engineering, Wenzhou University of Technology, Wenzhou Zhejiang 325000, China
摘要To study the dynamic influence of hydraulic compactor reinforcing the subgrade on the back of abutment, based on the subgrade filling project of abutment back in the transition section of the high-speed bridge and tunnel, the interaction model of rammer, subgrade and abutment is established by ABAQUS. The accuracy of the model is verified by full-scale ramming test. In the process of simulation, the maximum dynamic displacement and maximum dynamic strain of abutment are taken as evaluation indexes. The influence of factors such as the dropping distance, the distance between tamping point and abutment, the initial compactness of subgrade, the strength grade of abutment concrete and the top support conditions of abutment on the abutment deformation were analyzed. The results show that (1) The error between the measured value and the simulated value is less than 10%, and the variation trend of abutment dynamic displacement and dynamic strain along the abutment height is in line with the convention, and the simulation model is reliable. (2) The maximum dynamic displacement and strain of abutment increase linearly with the increase of dropping distance and increase exponentially with the decrease of distance between tamping point and abutment. (3) When the initial compactness of subgrade increases from 75% to 95%, the maximum dynamic displacement and the maximum dynamic strain of abutment are basically the same, and the initial compactness of subgrade has little effect on the deformation of abutment. (4) The improvement of concrete strength grade of abutment has significant effect on the reduction of abutment deformation. (5) When there is no expansion joint at the top of the abutment, the maximum dynamic displacement and the maximum dynamic strain are reduced by 75% and 24% compared with those with expansion joint. In the process of reinforcement, the method of temporary blocking of bridge expansion joint can be used to change the stress form of abutment.
Abstract：To study the dynamic influence of hydraulic compactor reinforcing the subgrade on the back of abutment, based on the subgrade filling project of abutment back in the transition section of the high-speed bridge and tunnel, the interaction model of rammer, subgrade and abutment is established by ABAQUS. The accuracy of the model is verified by full-scale ramming test. In the process of simulation, the maximum dynamic displacement and maximum dynamic strain of abutment are taken as evaluation indexes. The influence of factors such as the dropping distance, the distance between tamping point and abutment, the initial compactness of subgrade, the strength grade of abutment concrete and the top support conditions of abutment on the abutment deformation were analyzed. The results show that (1) The error between the measured value and the simulated value is less than 10%, and the variation trend of abutment dynamic displacement and dynamic strain along the abutment height is in line with the convention, and the simulation model is reliable. (2) The maximum dynamic displacement and strain of abutment increase linearly with the increase of dropping distance and increase exponentially with the decrease of distance between tamping point and abutment. (3) When the initial compactness of subgrade increases from 75% to 95%, the maximum dynamic displacement and the maximum dynamic strain of abutment are basically the same, and the initial compactness of subgrade has little effect on the deformation of abutment. (4) The improvement of concrete strength grade of abutment has significant effect on the reduction of abutment deformation. (5) When there is no expansion joint at the top of the abutment, the maximum dynamic displacement and the maximum dynamic strain are reduced by 75% and 24% compared with those with expansion joint. In the process of reinforcement, the method of temporary blocking of bridge expansion joint can be used to change the stress form of abutment.
潘金楠, 徐天宇. Analysis on the Influence Factors of the Hydraulic Compactor to Reinforce the Subgrade on the Back of Abutment[J]. Journal of Highway and Transportation Research and Development, 2023, 17(1): 21-33.
PAN Jin-nan, XU Tian-yu. Analysis on the Influence Factors of the Hydraulic Compactor to Reinforce the Subgrade on the Back of Abutment. Journal of Highway and Transportation Research and Development, 2023, 17(1): 21-33.
[1] JIANG Gong-xue. Discussion on the Design and Construction of Abutment Backfill of High-grade Highway [J]. China Journal of Highway and Transport, 1995,8(2): 19-24, 52. (in Chinese) [2] KODIKARA J, ISLAM T, SOUNTHARARAJAH A. Review of Soil Compaction: History and Recent Developments. Transportation Geotechnics,2018,17(2):24-34. [3] BASHAR T, BODOUR W. Liquefaction Mitigation of Desert Sand Using Rapid Impact Compaction [J]. Arbain Journal of Geosciences,2018,11(12):309. [4] YU Ke-ping, SHE Xue-sen. Research on the Model Experiment about Back Subgrade of Abutment under Vibrating Force through Strong Tamp [J]. Chinese Journal of Northwest Institute of Architecture and Engineering: Natural Science,2003,19(2):20-23, 32. (in Chinese) [5] JIN Yu, LI Ri-yun, SUN Wen-huai, et al. Study of RIC Construction Technology for Dynamic Consolidation of High Embankment [J]. Journal of Engineering Geology, 2008,16(3): 135-139. (in Chinese) [6] WU Y K, SANG X S, NIU B. High-speed Hydraulic Compactor Application in the Backfilled of Bridge Platform[J]. Applied Mechanics and Materials, 2012,212/213(2):1201-1204. [7] KONG Ling-wei, YUAN Jian-xin. Study on Surface Contact Stress and Settlement Properties during Dynamic Consolidation [J]. Chinese Journal of Geotechnical Engineering, 1998,20(2): 86-92. (in Chinese) [8] ZHANG Tao, LV Shu-ran, Yang Kai. Effect of Dynamic Compaction Vibration on Surrounding Environment [J]. China Safety Science Journal, 2014,24(11): 127-132. (in Chinese) [9] YANG Jian-guo, PENG Weng-xuan, LIU Dong-yan. Research of Choosing Tamping Factors for Dynamic Consolidation Method [J]. Rock and Soil Mechanics, 2004(8):1335-1339. (in Chinese) [10] FENG Xiong-hui, WAN Zhi. Field Test and Numerical Simulation Study on Treatment of Expressway Retailing Backwall by Hydraulic Compaction [J]. Journal of Railway Science and Engineering, 2013,10(1): 49-54. (in Chinese) [11] LIU Jian-qi, SI Kui-mao, ZHANG Meng-qiang. Field Test and Numerical Simulation Study on Treatment of Expressway Retailing Backwall by Hydraulic Compaction [J]. Road Machinery & Construction Mechanization, 2017,33(2):118-121. (in Chinese) [12] NAZHAT Y, AIREY D. The Kinematics of Granular Soils Subjected to Rapid Impact Loading [J]. Granular Matter,2015,17(1):1-20. [13] CHEN Jian, SU Yue-hong. Numerical Simulation of Dynamic Performance of Highway Subgrade under Traffic Loads [J]. Journal of Highway and Transportation Research and Development, 2011,28(5):44-48. (in Chinese) [14] VINK J W, Dijkstra J W. CDC Compaction at Berth 9 Quay Extension Felixstowe, UK[J]. Procedia Engineering, 2016, 143: 1468-1476. [15] JIANG Wei-qiang, OUYANG Li-sheng. Study of Earthquake Effect of Dynamic Compaction [J]. Journal of Disaster Prevention and Mitigation Engineering, 2005,25(1): 45-48. (in Chinese) [16] YANG Zhi-gang. Experimental Research on Indoor Model for Soil Deformation after Forced Ramming Subgrade on Back of Abutment [J]. Subgrade Engineering, 2009(4): 64-65. (in Chinese) [17] JTG D60—2015, General Specifications for Design of Highway Bridges and Culverts [S]. (in Chinese) [18] FENG Zhong-ju, HE Jing-bin, DONG Yun-xiu, et al. Analysis on Influence of Rigid Long-short-pile Soft Foundation Pretreatment on Deformation of Adjacent Surcharged Pile Foundation and Treatment Effect Evaluation [J]. Journal of Highway and Transportation Research and Development, 2017,14(6):1206-1216. (in Chinese) [19] ALLOUZI R, BODOUR W A L, ALKLOUB A, et al. Finite-element Model to Simulate Ground-improvement Technique of Rapid Impact Compaction[J]. Proceedings of the Institution of Civil Engineers-Ground Improvement,2019,172(1):44-52. [20] WANG Yi, MO Jin-sheng, LI Jian-zhong. Effect of Concrete Shear Keys at Abutment on Seismic Response of Continuous Girder Bridge [J]. Journal of Tongji University: Natural Science, 2017,45(7): 948-953, 1043. (in Chinese) [21] GANESH A C, MUTHUKANNAN M, MALATHY R, et al. An Experimental Study on Effects of Bacterial Strain Combination in Fibre Concrete and Self-Healing Efficiency [J]. KSCE Journal of Civil Engineering, 2019,23(10):4368-4377.
2023, Vol. 17 
