In order to explore the stability failure mechanism of reinforced concrete pipes during jacking in soft soil stratum and the influencing laws of various factors, a method for determining the pipe stability failure considering the pipe-soil contact state, pipe deflection, jacking force, buoyancy and slurry pressure is proposed through theoretical analysis. The applicability of this method was verified based on the field test data of the Tangxun Lake pipe jacking project in Wuhan. In addition, the influencing regularities of geological parameters, jacking force, pipe deflection angle and slurry pressure on the pipe stability failure were investigated through numerical simulation. The results show that: (1) The pipe-soil contact state and pipe deflection have a significant effect on the ultimate stress and additional stress of the soil around the pipes. (2) The stability failure of the pipe can be effectively determined by calculating the initial stress, additional stress and ultimate stress of the soil around the pipe. (3) The most obvious phenomenon of the pipe stability failure is the increase in the pipe displacement, and the pipe at the maximum axial deviation can be selected for stability failure analysis in actual construction. (4) In soft soil stratum, slurry pressure, buoyancy, pipe deflection, and jacking force are the main factors causing the stability failure of the pipe, and the above parameters should be monitored and controlled during construction.
[1] 魏纲, 徐日庆, 黄斌. 长距离顶管管道的失稳分析[J]. 岩石力学与工程学报, 2005, 24(8): 1427-1432. (Wei Gang, Xu Riqing, Huang Bin. Analysis of stability failure for pipeline during long distance pipe jacking[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(8): 1427-1432. (in Chinese))
[2]陈晓晨, 毛海明, 黄金明. 超大直径混凝土顶管在浅覆土软土层下的管道失稳分析[J]. 特种结构, 2015, 32(1): 75-80. (Chen Xiaochen, Mao Minghai, Huang Jinming. Analysis of stability failure for super larger diameter concrete pipe jacking in shallow cover and soft soil[J]. Special Structures, 2015, 32(1): 75-80. (in Chinese))
[3]Norris P. The behavior of jacked concrete pipes during site installation[D]. Oxford: University of Oxford, 1992.
[4]Nanno T.A method for driving curved pipe-jacked tunnels[J]. Tunnelling and Underground Space Technology, 1996, 11(2): 3-25.
[5]Milligan G W E, Norris P. Pipe-soil interaction during pipe jacking[J]. Proceedings of the Institution of Civil Engineers-Geotechnical Engineering, 1999, 137(1): 27-44.
[6]Liu J M, Cheng H, Cai H B, et al. Design and analysis of grouting pressure in slurry pipe jacking based on the surrounding soil stability mechanical characteristics[J]. Geofluids, 2022(1): 4697730.
[7]张鹏, 马保松, 曾聪, 等. 基于管土接触特性的顶进力计算模型分析[J]. 岩土工程学报, 2017, 39(2): 244-249. (Zhang Peng, Ma Baosong, Zeng Cong, et al. Numerical model for jacking force based on pipe-soil contact characteristics[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(2): 244-249. (in Chinese))
[8]张鹏, 谈力昕, 马保松. 考虑泥浆触变性和管土接触特性的顶管摩阻力公式[J]. 岩土工程学报, 2017, 39(11): 2043-2049. (Zhang Peng, Tan Lixin, Ma Baosong. Formulae for frictional resistance considering mud thixotropy and pipe-soil contact characteristics[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(11): 2043-2049. (in Chinese))
[9]王永东, 胡强, 张化川. 基于主动式纠偏的曲线顶管施工力学特性研究[J]. 地下空间与工程学报, 2020, 16(5): 1511-1520, 1528. (Wang Yongdong, Hu Qiang, Zhang Huachuan. Research on the mechanical characteristics of curved pipe jacking construction based on active deviation correction[J]. Chinese Journal of Underground Space and Engineering, 2020, 16(5): 1511-1520, 1528. (in Chinese))
[10]李清华. 潮汐作用对厦门海底顶管抗浮稳定性的影响分析[J]. 中国市政工程, 2016(2): 103-105, 122. (Li Qinghua. An influence analysis of tidal effects on the anti-floating stability of subsea pipe-jacking in Xiamen[J]. China Municipal Engineering, 2016(2): 103-105, 122. (in Chinese))
[11]张立新. 长距离顶管管道局部隆起失稳防治措施[J]. 建筑科技, 2019, 3(2): 24-25. (Zhang Lixin. Partial uplifting instability prevention in long distance pipe jacking construction[J]. Building Technology, 2019, 3(2): 24-25. (in Chinese))
[12]中国工程建设标准化协会. 给水排水工程顶管技术规程(CECS 246-2008)[S]. 北京: 中国计划出版社, 2008. (China Association for Engineering Construction Standardization. Technical specification for pipe jacking of water supply and sewerage engineering[S]. Beijing: China Planning Press, 2008. (in Chinese))
[13]Yen J, Shou K. Numerical simulation for the estimation the jacking force of pipe jacking[J]. Tunnelling and Underground Space Technology, 2015, 49: 218-229.
[14]Terzaghi K. Theoretical soil mechanics[M]. New York: John Wiley & Sons, Inc., 1943.
[15]Zhu D Y, Lee C F, Law K T.Determination of bearing capacity of shallow foundations without using superposition approximation[J]. Canadian Geotechnical Journal, 2003, 40(2): 450-459.
[16]Peng M X, Peng H X.The ultimate bearing capacity of shallow strip footings using slip-line method[J]. Soils and Foundations, 2019, 59(3): 601-616.
[17]王双, 夏才初, 葛金科. 考虑泥浆套不同形态的顶管管壁摩阻力计算公式[J]. 岩土力学, 2014, 35(1): 159-166, 174. (Wang Shuang, Xia Caichu, Ge Jinke. Formulae of lateral friction resistance for pipe-jacking considering different forms of mud screen[J]. Rock and Soil Mechanics, 2014, 35(1): 159-166, 174. (in Chinese))
[18]Ciavarella M, Decuzzi P. The state of stress induced by the plane frictionless cylindrical contact I: the case of elastic similarity[J]. International Journal of solids and Structures, 2001, 38(26-27): 4507-4523.
[19]Ciavarella M, Decuzzi P. The state of stress induced by the plane frictionless cylindrical contact Ⅱ: the general case (elastic dissimilarity) [J]. International Journal of solids and Structures, 2001, 38(26-27): 4525-4533.
[20]丁传松. 直线及曲线顶管施工中的顶推力研究[D]. 南京: 南京工业大学, 2004. (Ding Chuansong. Study on the jacking force induced by linear and curved pipe jacking construction[D]. Nanjing: Nanjing University of Technology, 2004. (in Chinese))
[21]Zhang P, Behbahani S S, Ma B S, et al. A jacking force study of curved steel pipe roof in Gongbei tunnel: calculation review and monitoring data analysis[J]. Tunnelling and Underground Space Technology, 2018, 72: 305-322.
[22]中华人民共和国住房和城乡建设部. 建筑结构荷载规范(GB 50009-2012)[S]. 北京: 中国建筑工业出版社, 2012. (Ministry of Housing and Urban-Rural Development of the People's Republic of China. Load code for the design of building structures[S]. Beijing: China Architecture & Building Press, 2012. (in Chinese))
[23]Mitchell J K. Fundamental aspects of thixotropy in soils[J]. Transactions of the American Society of Civil Engineers, 1961, 126(1): 1586-1620.
[24]汤斌, 姚正, 亢佳帅. 扰动程度对湛江组结构性黏土触变性的影响[J]. 科学技术与工程, 2021, 21(21): 9059-9066. (Tang Bin, Yao Zheng, Kang Jiashuai. Effect of disturbance degree on thixotropy of structural clay in Zhanjiang Formation[J]. Science Technology and Engineering, 2021, 21(21): 9059-9066. (in Chinese))
[25]朱庆华, 黄剑锋, 何勇, 等. 基于强度折减法的穿江管道抗浮稳定性分析[J]. 现代隧道技术, 2019, 56(1): 94-98, 113. (Zhu Qinghua, Huang Jianfeng, He Yong, et al. Analysis of the Stability of River-crossing Pipelines against Uplift Based on the Strength Reduction Method[J]. Modern Tunnelling Technology, 2019, 56(1): 94-98, 113. (in Chinese))
[26]陈以超, 张黎明, 丛宇, 等. 基于局部强度折减法的地下洞室群“危险区”破坏判据及其工程应用[J]. 隧道建设(中英文), 2023, 43(4): 634-644. (Chen Yichao, Zhang Liming, Cong Yu, et al. Damage Criterion of Danger Zone of Underground Cavern Group Based on Local Strength Reduction Method and Its Engineering Application[J]. Tunnel Construction, 2023, 43(4): 634-644. (in Chinese))
