基于冗余度理论的土岩基坑无岩肩吊脚墙体系可靠度分析

作者：雷文革¹,周小涵²,王林枫²,王自强²

作者简介：

雷文革,高级工程师,E⁃mail:Lei_wenge@ 126. com

作者单位：

1. 中铁大桥勘测设计院集团有限公司,湖北武汉 430050; 2. 重庆大学土木工程学院,重庆 400045

基金项目：

∗国家自然科学基金青年基金(52104076)

摘要：

以广州地铁 12 号线岭南广场站为工程背景,提出考虑杆件极限承载力的冗余度表达公式. 建立土岩复合地层无岩肩吊脚墙支护体系下的基坑开挖三维数值模型,探讨不同土岩交界面深度、下卧岩层强度下无岩肩吊脚墙支护体系的可靠度. 研究结果表明,强度冗余度和刚度冗余度计算结果较集中,且刚度冗余度评价结果最保守,考虑杆件极限承载力的冗余度计算结果更分散,且随工况不同更敏感.

关键词：地铁车站;基坑;冗余度;可靠度;数值模拟

English：

Based on the engineering background of Lingnan Square Station of Guangzhou Subway Line 12,a redundancy expression formula considering the ultimate bearing capacity of members is proposed. Athree⁃dimensional numerical model of foundation pit excavation under the supporting system of asuspended diaphragm wall without rock shoulder in soil⁃rock composite strata was established, and thereliability of the supporting system of a suspended diaphragm wall without rock shoulder under differentsoil⁃rock interface depths and underlying rock stratum strengths was discussed. The results indicate thatthe calculation results of strength redundancy and stiffness redundancy are more concentrated, and theevaluation results of stiffness redundancy are the most conservative. The calculation results of redundancyconsidering the ultimate bearing capacity of members are more dispersed and more sensitive to differentworking conditions.

[1]	田仕文,周长海,赵鹏. 滨海浅滩地区土岩组合地层深大基坑支护技术[J]. 施工技术,2013,42(8):79⁃81,85.TIAN S W,ZHOU C H,ZHAO P. Support technology for deepand large foundation excavation in the soil and rock strata ofcoastal shallows area[J]. Construction technology,2013,42(8):79⁃81,85.
[2]	沈圆顺. 土岩组合地铁深基坑变形特性与控制指标研究[M]. 镇江:江苏大学出版社,2018.SHEN Y S. Study on deformation characteristics and control indexof deep foundation excavation of soil⁃rock combined subway[M].Zhenjiang:Jiangsu University Press,2018.
[3]	李隆平,周小涵,王林枫. 新型吊脚墙支护二元基坑变形特征与地层适应性研究[ J]. 施工技术(中英文),2023,52( 19):31⁃39.LI L P, ZHOU X H, WANG L F. Research on deformationcharacteristics and stratum adaptability of new type end⁃suspended wall supported soil⁃rock mixed stratum foundationexcavation[J]. Construction technology,2023,52(19):31⁃39.
[4]	赵顺磊,徐武,王自强,等. 土岩基坑无岩肩吊脚墙支护变形与力学响应特征研究[J]. 施工技术(中英文),2023,52(7):106⁃114.ZHAO S L,XU W,WANG Z Q,et al. Supporting deformation andmechanical response characteristics of diaphragm wall withoutrock shoulder in soil⁃rock foundation excavation[J]. Constructiontechnology,2023,52(7):106⁃114.
[5]	LI L P, WANG L F, ZHOU X H, et al. Study on deformationcharacteristics and instability failure mode of new suspendeddiaphragm wall deep excavation in soil⁃rock strata[J]. Advancesin transdisciplinary engineering, 2022, 31: 727⁃738.
[6]	江晓峰,陈以一. 建筑结构连续性倒塌及其控制设计的研究现状[J]. 土木工程学报,2008,41(6):1⁃8.JIANG X F,CHEN Y Y. A review on the progressive collapse andcontrol design of building structures[ J]. China civil engineeringjournal,2008,41(6):1⁃8.
[7]	高峰,杨大彬,靳卫恒. K6 型单层网壳极限承载力对杆件失效的灵敏度分析[J]. 工程建设与设计,2009(8):16⁃19.GAO F, YANG D B, JIN W H. Sensitivity analysis on loadcarrying capacity of K6 single⁃layer reticulated shells to memberfailure[J]. Construction & design for project,2009(8):16⁃19.
[8]	CHOOSRITHONG K,SCHWEIGER H F. Numerical investigationof sequential strut failure on performance of deep excavations insoft soil[J]. International journal of geomechanics,2020,20(6):04020063.
[9]	CHENG X S,ZHENG G,DIAO Y,et al. Experimental study ofthe progressive collapse mechanism of excavations retained bycantilever piles[J]. Canadian geotechnical journal,2017,54(4):574⁃587.
[10]	CHENG X S,ZHENG G,DIAO Y,et al. Study of the progressivecollapse mechanism of excavations retained by cantilevercontiguous piles [ J ]. Engineering failure analysis, 2017, 71:72⁃89.
[11]	郑刚,程雪松,周海祚,等. 岩土与地下工程结构韧性评价与控制[J]. 土木工程学报,2022,55(7):1⁃38.ZHENG G,CHENG X S,ZHOU H Z,et al. Resilient evaluationand control in geotechnical and underground engineering [ J].China civil engineering journal,2022,55(7):1⁃38.
[12]	袁小峰. 深基坑内撑式排桩支护结构局部失效及冗余度研究[D]. 重庆:重庆大学,2019.YUAN X F. Study on partial failure and redundancy of retainingpiles structure with interior bracing in the deep foundationexcavation[D]. Chongqing:Chongqing University,2019.
[13]	FRANGOPOL D M, CURLEY J P. Effects of damage andredundancy on structural reliability [ J ]. Journal of structuralengineering,1987,113(7):1533⁃1549.
[14]	江杰,肖萌,龙团元,等. 基于冗余度理论的深基坑环梁支撑优化分析[J]. 广西大学学报( 自然科学版),2017,42( 6):2339⁃2346.JIANG J,XIAO M,LONG T Y,et al. Redundancy of ring⁃beamsupporting structures of deep excavations[ J]. Journal of GuangxiUniversity (natural science edition),2017,42(6):2339⁃2346.
[15]	江杰,顾倩燕,胡何,等. 双排钢板桩围堰的冗余度分析[ J].岩土力学,2015,36(S1):518⁃522.JIANG J,GU Q Y,HU H,et al. Study of redundancy of double⁃row steel sheet piles cofferdam [ J]. Rock and soil mechanics,2015,36(S1):518⁃522.
[16]	王涛. 侧压力作用下混凝土的剪切试验研究及应用[D]. 湘潭:湖南科技大学,2019.WANG T. Shear test research of concrete under lateral pressureand application[D]. Xiangtan:Hunan University of Science andTechnology,2019.

岩土与地下工程 > 2025年 第卷 第11期