海域人工岛填筑及地下互通隧道施工对邻近桥梁桩基影响研究
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摘要
针对深中通道东人工岛下穿广深沿江高速桥梁工程建设过程出现堆载开挖问题,为了保障临近桥梁安全运营,考虑土体硬化特性,重点研究了海域分层填筑及桥桩保护措施,以及人工岛隧道基坑下穿及并行既有桥梁桩基两类典型不利工况,分析了依托工程筑岛后互通隧道施工过程与桥梁结构之间的相互影响,提出了分层分块填土、钢板桩加固、旋喷桩加固等措施要点,以及隧道下穿和并行时基坑设计关键技术。结果表明:横桥向两侧分层交替填筑有利于降低对桥梁桩基的影响;钢板桩内先填土方案可降低桩身弯矩50%左右;支护桩从嵌入强风化岩至嵌入中风化岩过程,临近桩基变形可降低30%左右;采取针对性的桥桩保护措施可控制各种不利工况下桩身变形及裂缝在设计规范要求范围内,并保障邻近广深沿江高速桥梁正常运营安全。研究成果可为类似海域明筑地下互通设计与施工安全提供有益的参考。
Aiming at the engineering problem from the preloading excavation for the project of downward crossing the bridge of Guangzhou Shenzhen Highway along the Pearl River for the eastern artificial island of Shenzhong Channel, the layered filling and the bridge pile protection measures in sea area as well as two kinds of typical unfavorable working conditions of the artificial island tunnel foundation pit downward-crossing and parallelly passing the existing bridge pile foundation are emphasically studied herein under the consideration of the hardening characteristics of soil mass therein, so as to ensure the safe operation of the bridge nearby, while the interactive influence between the construction of the interchange tunnel after the filling of the island and the relevant bridge structure are analyzed, and then the main points of the measures such as layered and sectionalized filling, steel sheet pile reinforcement, jet grouting pile reinforcement, etc. as well as the key design technologies of the foundation pit for the downward crossing and parallelly passing are proposed herein as well. The study result shows that the layered-alternated filling on both the sides in the transverse direction of bridge is conducive to reduce the impact on the pile foundation of the bridge. The bending moment of the pile body can be decreased by about 50% with the scheme of prefilling inside of the steel sheet pile, while the deformation of the adjacent pile foundation can be decreased by about 30% during embedding the supporting pile from the strong weathered rock to the moderately weathered rock. The adoptions of the targetable bridge pile protection measures can control the pile body deformation and cracking under all the unfavorable working conditions within the range of the design specifications concerned, thus guarantee the operation safety of the bridge of Guangzhou Shenzhen Highway along the Pearl River. The study result can provide beneficial reference for the design and construction safety of the underground interchange filled in the similar sea area.
Aiming at the engineering problem from the preloading excavation for the project of downward crossing the bridge of Guangzhou Shenzhen Highway along the Pearl River for the eastern artificial island of Shenzhong Channel, the layered filling and the bridge pile protection measures in sea area as well as two kinds of typical unfavorable working conditions of the artificial island tunnel foundation pit downward-crossing and parallelly passing the existing bridge pile foundation are emphasically studied herein under the consideration of the hardening characteristics of soil mass therein, so as to ensure the safe operation of the bridge nearby, while the interactive influence between the construction of the interchange tunnel after the filling of the island and the relevant bridge structure are analyzed, and then the main points of the measures such as layered and sectionalized filling, steel sheet pile reinforcement, jet grouting pile reinforcement, etc. as well as the key design technologies of the foundation pit for the downward crossing and parallelly passing are proposed herein as well. The study result shows that the layered-alternated filling on both the sides in the transverse direction of bridge is conducive to reduce the impact on the pile foundation of the bridge. The bending moment of the pile body can be decreased by about 50% with the scheme of prefilling inside of the steel sheet pile, while the deformation of the adjacent pile foundation can be decreased by about 30% during embedding the supporting pile from the strong weathered rock to the moderately weathered rock. The adoptions of the targetable bridge pile protection measures can control the pile body deformation and cracking under all the unfavorable working conditions within the range of the design specifications concerned, thus guarantee the operation safety of the bridge of Guangzhou Shenzhen Highway along the Pearl River. The study result can provide beneficial reference for the design and construction safety of the underground interchange filled in the similar sea area.
引文
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[12] 李志伟. 软土地基邻近堆载对桥梁桩基偏位的影响研究[J]. 岩土力学, 2013,34(12):3594- 3600.
[13] 上官士青, 杨敏, 李卫超. 分别考虑桩和土水平向位移的被动桩简化算法[J]. 建筑结构学报, 2018, 39(1):162- 172.
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[17] BOZOZUK M. Bridge foundations move[J]. Transportation Research Record, 1978, 678: 17- 21.
[18] BROWN D A, TURNER J P, CASTELLI R J. Drilled shafts: Construction procedures and LRFD design methods[M]. Washington: US Department of Transportation, Federal Highway Administration, 2010.
[19] AASHTO L R F D. Bridge design specifications: LRFD SI- 3[S]. Washington: American Association of State Highway and Transportation Officials, Third Edition, 2004.
[20] Canadian Geotechnical Society. Canadian foundation engineering manual[M]. Montreal, Quebec: Canadian Geotechnical Society, Forth Edition, 2006.
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[22] 建设部. 建筑桩基技术规范:JCJ 94—2008[S]. 北京: 中国建筑工业出版社, 2008.
[2] KIMURA H, KOJIMA I, MORITAKA H. Development of sandwich-structure Submerged tunnel tube production method[J]. Nippon Steel Technical Report, 2002: 86- 93.
[3] POULOS H G, CHEN L T. Pile response due to unsupported excavation-induced lateral soil movement[J]. Canadian Geotechnical Journal, 1996, 33(4): 670- 677.
[4] LEUNG C F, CHOW Y K, SHEN R F. Behavior of pile subject to excavation-induced soil movement[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(11): 947- 954.
[5] SHAKEEL M, NG C W W. Settlement and load transfer mechanism of a pile group adjacent to a deep excavation in soft clay[J]. Computers and Geotechnics, 2018, 96: 55- 72.
[6] 黄茂松,张陈蓉,李早. 开挖条件下非均质地基中被动群桩水平反应分析[J].岩土工程学报, 2008, 30(7):1017- 1023.
[7] 张爱军,莫海鸿,李爱国,高伟,向玮.基坑开挖对邻近桩基影响的两阶段分析方法[J].岩石力学与工程学报,2013,32(增刊1):2746- 2750.
[8] 张治国, 鲁明浩, 宫剑飞. 黏弹性地基中基坑开挖对邻近桩基变形影响的时域解[J]. 岩土力学, 2017, 38(10):3017- 3028.
[9] HEYMAN L, BOERSMA L. Bending moments in piles due to lateral earth pressure[C]//ICSMFE. Proceedings of the 5th International Conference on Soil Mechanics and Foundation Engineering. Paris: AA Balkema, 1961: 425- 429.
[10] GOH A T C, TEH C I, WONG K S. Analysis of piles subjected to embankment induced lateral soil movements[J]. Journal of Geotechnical & Geoenvironmental Engineering, 1997, 123(9):792- 801.
[11] 马远刚, 王艳芬, 陈晨. 堆载作用下桥梁被动桩偏移受力分析及处理措施[J]. 桥梁建设, 2014, 44(4):22- 26.
[12] 李志伟. 软土地基邻近堆载对桥梁桩基偏位的影响研究[J]. 岩土力学, 2013,34(12):3594- 3600.
[13] 上官士青, 杨敏, 李卫超. 分别考虑桩和土水平向位移的被动桩简化算法[J]. 建筑结构学报, 2018, 39(1):162- 172.
[14] POTTS D M, ZDRAVKOVIC L, ZDRAVKOVI L. Finite element analysis in geotechnical engineering: application[M]. London: Thomas Telford, 2001.
[15] 徐中华, 王卫东. 敏感环境下基坑数值分析中土体本构模型的选择[J]. 岩土力学, 2010, 31(1): 258- 264.
[16] BRINKGREVE R B J, ENGIN E, SWOLFS W M. PLAXIS 3D 2013 user manual[M]. Netherlands: Plaxis bv, Delft, 2013.
[17] BOZOZUK M. Bridge foundations move[J]. Transportation Research Record, 1978, 678: 17- 21.
[18] BROWN D A, TURNER J P, CASTELLI R J. Drilled shafts: Construction procedures and LRFD design methods[M]. Washington: US Department of Transportation, Federal Highway Administration, 2010.
[19] AASHTO L R F D. Bridge design specifications: LRFD SI- 3[S]. Washington: American Association of State Highway and Transportation Officials, Third Edition, 2004.
[20] Canadian Geotechnical Society. Canadian foundation engineering manual[M]. Montreal, Quebec: Canadian Geotechnical Society, Forth Edition, 2006.
[21] 中华人民共和国铁道部. 铁路桥涵设计基本规范:J 460—2005[S]. 北京:中国铁道出版社, 2005.
[22] 建设部. 建筑桩基技术规范:JCJ 94—2008[S]. 北京: 中国建筑工业出版社, 2008.