软土地区基坑前排倾斜双排桩支护现场试验及工作机理

郑刚; 王玉萍; 程雪松; 余地华; 黄晓程; 李昕昊

doi:10.11988/ckyyb.20230171

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raybet体育在线院报 ›› 2024, Vol. 41 ›› Issue (6) : 98-105. DOI: 10.11988/ckyyb.20230171

岩土工程

软土地区基坑前排倾斜双排桩支护现场试验及工作机理

郑刚¹, 王玉萍^1,2, 程雪松¹, 余地华³, 黄晓程³, 李昕昊^1,4

作者信息 +

Field Experiment and Working Mechanism of Foundation Pit Excavation Retained by Front-row Inclined Double Row Piles in Soft Soil Area

ZHENG Gang¹, WANG Yu-ping^1,2, CHENG Xue-song ¹, YU Di-hua³, HUANG Xiao-cheng³, LI Xin-hao^1,4

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文章历史 +

摘要

基坑倾斜桩支护大幅提高了无支撑支护结构的适用深度,具有造价低、施工便捷、绿色低碳、变形控制好等特点,然而目前研究多集中在单排倾斜桩,对前排倾斜双排桩支护的试验、理论与应用的研究均较少。针对前排倾斜双排桩支护基坑开展了现场试验,同时采用有限元方法分别从前排斜桩、桩顶连梁及桩间土体作用3个方面深入探究了前排倾斜双排桩支护的工作机理,进一步分析了直斜桩长度和排距对前排倾斜双排桩支护结构受力变形性能的影响。结果表明,相比传统竖直双排桩,前排倾斜双排桩支护结构的支护性能显著提升,前排斜桩主要发挥“斜撑”作用,连梁主要起到将直斜桩及冠梁连接成一个空间刚架的作用,桩间土体能够提高桩土摩阻力,进而有效减小前排倾斜双排桩变形。研究成果有助于前排倾斜双排桩的推广和应用。

Abstract

Inclined pile support has notably extended the applicable depth of unsupported retaining structures, boasting advantages such as cost-effectiveness, ease of construction, environmental friendliness, and precise deformation control. However, current researches focus on single row inclined piles, while research on the testing, theory, and application of inclined double-row pile support remains limited. We conducted field experiments to assess excavation supported by double-row piles with the front row inclined. Additionally, employing the finite element method, we investigated the underlying working mechanisms from three aspects: the front-row inclined double-row piles, the connecting beam on top of piles, and the soil interaction among piles. We further examined the impact of pile length and row spacing on the deformation characteristics of inclined double-row piles. Our findings indicate a marked enhancement in the supportive capabilities of front-row inclined double-row pile compared to traditional vertical double-row piles. The front-row inclined double-row piles primarily serve as diagonal bracing, while the beams connect the piles and the crown beam into a spatially rigid frame. Soil between the piles enhances pile-soil friction, effectively mitigating deformation in inclined double-row piles.

导出引用

郑刚, 王玉萍, 程雪松, 余地华, 黄晓程, 李昕昊. 软土地区基坑前排倾斜双排桩支护现场试验及工作机理[J]. raybet体育在线院报. 2024, 41(6): 98-105 https://doi.org/10.11988/ckyyb.20230171

ZHENG Gang, WANG Yu-ping, CHENG Xue-song , YU Di-hua, HUANG Xiao-cheng, LI Xin-hao. Field Experiment and Working Mechanism of Foundation Pit Excavation Retained by Front-row Inclined Double Row Piles in Soft Soil Area[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(6): 98-105 https://doi.org/10.11988/ckyyb.20230171

中图分类号： TU473.2

参考文献

[1] 郑刚, 李欣, 刘畅, 等. 考虑桩土相互作用的双排桩分析[J]. 建筑结构学报, 2004, 25(1): 99-106. (ZHENG Gang, LI Xin, LIU Chang, et al. Analysis of Double-row Piles in Consideration of the Pile-soil Interaction[J]. Journal of Building Structures, 2004, 25(1): 99-106.(in Chinese))
[2] 何颐华,杨斌,金宝森,等.双排护坡桩试验与计算的研究[J].建筑结构学报,1996,17(2):58-66.(HE Yi-hua,YANG Bin,JIN Bao-sen,et al. Study on Test and Calculation of Double-row Slope Protection Piles[J].Journal of Building Structures,1996,17(2):58-66.(in Chinese))
[3] 蔡袁强,阮连法,吴世明,等.软粘土地基基坑开挖中双排桩式围护结构的数值分析及应用[J].建筑结构学报,1999,20(4):65-71.(CAI Yuan-qiang,RUAN Lian-fa,WU Shi-ming,et al. Finite Element Analysis and Application of Deep Excavation with Retaining Structure of Double-row Piles in Soft Clay[J]. Journal of Building Structures,1999,20(4):65-71.(in Chinese))
[4] 金亚兵, 周志雄. 挡土墙(桩)前堆载反压或预留土体分析与计算[J]. 岩土力学, 1999, 20(3): 56-60, 65. (JIN Ya-bing, ZHOU Zhi-xiong. Analysis and Calculation Method of Surcharge Reaction and Remaining Soils near Retaining Wall[J]. Rock and Soil Mechanics, 1999, 20(3): 56-60, 65.(in Chinese))
[5] 郑刚,陈红庆,雷扬,等.基坑开挖反压土作用机制及其简化分析方法研究[J].岩土力学,2007,28(6):1161-1166.(ZHENG Gang,CHEN Hong-qing,LEI Yang,et al.A Study of Mechanism of Earth Berm and Simplified Analysis Method for Excavation[J]. Rock and Soil Mechanics,2007,28(6):1161-1166.(in Chinese))
[6] GEORGIADIS M, ANAGNOSTOPOULOS C. Effect of Berms on Sheet-pile Wall Behaviour[J]. Géotechnique, 1998, 48(4): 569-574.
[7] POWRIE W, CHANDLER R J. The Influence of a Stabilizing Platform on the Performance of an Embedded Retaining Wall: a Finite Element Study[J]. Géotechnique, 1998, 48(3): 403-409.
[8] 叶强,王贞祥,吴如瑜,等.珠海拱北口岸广场地下连续墙支护设计[J].铁道工程学报,2002,19(2):93-99.(YE Qiang,WANG Zhen-xiang,WU Ru-yu,et al. Design of Underground Diaphragm Wall Support for Public Square at Gongbei Port in Zhuhai City[J]. Journal of Railway Engineering Society,2002,19(2):93-99.(in Chinese))
[9] 包旭范, 庄丽, 吕培林. 大型软土基坑中心岛法施工中土台预留宽度的研究[J]. 岩土工程学报, 2006, 28(10): 1208-1212. (BAO Xu-fan, ZHUANG Li, LÜ Pei-lin. Study on Mound Width Remained during the Construction of Central Island for Large Foundation Pits in Soft Soils[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(10): 1208-1212.(in Chinese))
[10] 郑刚,程雪松,刁钰.无支撑多级支护结构稳定性与破坏机理分析[J].天津大学学报,2013,46(4):304-314.(ZHENG Gang,CHENG Xue-song,DIAO Yu.Analysis of the Stability and Collapse Mechanism of Non-prop and Multi-stage Retaining Structure[J]. Journal of Tianjin University,2013,46(4):304-314.(in Chinese))
[11] 郑刚,聂东清,程雪松,等.基坑分级支护的模型试验研究[J].岩土工程学报,2017,39(5):784-794.(ZHENG Gang,NIE Dong-qing,CHENG Xue-song, et al.Experimental Study on Multi-bench Retaining Foundation Pit[J]. Chinese Journal of Geotechnical Engineering,2017,39(5):784-794.(in Chinese))
[12] 翁其平, 王卫东. 多级梯次联合支护体系在上海虹桥综合交通枢纽基坑工程中的设计与实践[J]. 建筑结构, 2012, 42(5): 172-176. (WENG Qi-ping, WANG Wei-dong. Design and Construction of Multi-level Supporting System for Deep Foundation Pits Excavation of Shanghai Hongqiao Integrated Transport Hub[J]. Building Structure, 2012, 42(5): 172-176.(in Chinese))
[13] 郭建芝, 曹华先. 斜桩挡土支护深基坑[J]. 广州建筑, 1997, 25(2): 38-41. (GUO Jian-zhi, CAO Hua-xian. Inclined Pile Retaining Soil to Support Deep Foundation Pit[J]. Guangzhou Architecture, 1997, 25(2): 38-41.(in Chinese))
[14] MAEDA T, SHIMADA Y, TAKAHASHI S, et al. Design and Construction of Inclined-Braceless Excavation Support Applicable to Deep Excavation[C] //International Society for Soil Mechanics and Geotechnical Engineering .Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering Paris, September 2-5, 2013: 2051-2054.
[15] SEO M, IM J C, KIM C, et al. Study on the Applicability of a Retaining Wall Using Batter Piles in Clay[J]. Canadian Geotechnical Journal, 2016, 53(8): 1195-1212.
[16] 郑刚,王玉萍,程雪松,等.基坑倾斜桩支护性能及机理大型模型试验研究[J].岩土工程学报,2021,43(9):1581-1591.(ZHENG Gang,WANG Yu-ping,CHENG Xue-song,et al. Large-scale Model Tests on Performance and Mechanism of Inclined Retaining Structures of Excavations[J]. Chinese Journal of Geotechnical Engineering,2021,43(9):1581-1591.(in Chinese))
[17] 周海祚,郑刚,何晓佩,等.基坑倾斜桩支护稳定特性及分析方法研究[J].岩土工程学报,2022,44(2):271-277.(ZHOU Hai-zuo,ZHENG Gang,HE Xiao-pei,et al.Stability Characteristics and Analysis Method for Inclined Retaining Walls in Excavations[J].Chinese Journal of Geotechnical Engineering,2022,44(2):271-277.(in Chinese))
[18] 刘畅,马力遥,郑刚,等.斜直交替基坑支护桩现场实测及机理研究[J].岩土工程学报,2022,44(5):827-835.(LIU Chang,MA Li-yao,ZHENG Gang,et al.Field Measurement and Mechanism of Inclined and Vertical Piles in Foundation Pits[J]. Chinese Journal of Geotechnical Engineering,2022,44(5):827-835.(in Chinese))
[19] 徐源, 郑刚, 路平. 前排桩倾斜的双排桩在水平荷载下的性状研究[J]. 岩土工程学报, 2010, 32(增刊1): 93-98. (XU Yuan, ZHENG Gang, LU Ping. Study on Behavior of Double-row Piles with Inclined Front Row Piles under Horizontal Load[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(Supp.1): 93-98.(in Chinese))
[20] 张松波, 赖国梁, 宋志, 等. 深基坑无支撑支护前排倾斜双排桩设计与应用分析[J]. 地下空间与工程学报, 2021, 17(增刊1): 228-234. (ZHANG Song-bo, LAI Guo-liang, SONG Zhi, et al. Design and Application Analysis of Front Row Inclined Double-row Piles without Support in Deep Foundation Pit[J]. Chinese Journal of Underground Space and Engineering, 2021, 17(Supp.1): 228-234.(in Chinese))
[21] ZHENG G, YANG X, ZHOU H, et al. A Simplified Prediction Method for Evaluating Tunnel Displacement Induced by Laterally Adjacent Excavations[J]. Computers and Geotechnics, 2018, 95: 119-128.
[22] OU C Y, HSIEH P G, CHIOU D C. Characteristics of Ground Surface Settlement during Excavation[J]. Canadian Geotechnical Journal, 1993, 30(5): 758-767.
[23] LONG M. Closure to “Database for Retaining Wall and Ground Movements Due to Deep Excavations” by Michael Long[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002, 128(6): 536-537.
[24] 李琳,杨敏,熊巨华.软土地区深基坑变形特性分析[J].土木工程学报,2007,40(4):66-72.(LI Lin,YANG Min,XIONG Ju-hua.Analysis of the Deformation Characteristics of Deep Excavations in Soft Clay[J]. China Civil Engineering Journal,2007,40(4):66-72.(in Chinese))
[25] 徐中华. 上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D]. 上海: 上海交通大学, 2007. (XU Zhong-hua. Deformation Behavior of Deep Excavations Supported by Permanent Structure in Shanghai Soft Deposit[D].Shanghai: Shanghai Jiao Tong University, 2007. (in Chinese))