Tunnel excavation can easily cause settlement and deformation of the surface of the overlying surface, which will further cause the stress and deformation response of the existing pipeline. Based on this, a simplified method for calculating the deformation of the overlying pipeline due to shield excavation is proposed. Firstly, the Loganathan formula is selected to solve the additional stress along the pipeline induced by tunneling underlying, and the pipeline is further simplified into an infinitely long beam resting on the Pasternak foundation. The influence of the lateral displacement of the infinite distal soil on the existing pipeline is introduced. Then, the mechanical equilibrium method is used to obtain the control equation of the vertical force and deformation of the pipeline. The finite difference method is selected to obtain the numerical analytical solution of the pipeline deformation and internal force analysis. The case analysis shows that, compared with the degradation analysis of this method, the calculation results are closer to the measured data of an actual project in the existing literature, which verifies the reliability of this method. Further parameter studies show that increasing the vertical clearance between the tunnel and the pipeline causes a nonlinear reduction in the stress and deformation of the pipeline. Increasing the volume loss rate results in a linear increase in the deformation and inner force of the pipeline. Increasing the pipeline bending stiffness reduces the pipeline deformation but greatly increases the pipeline bending moment.
KLARA, VORSTERT E B, SOGAK, et al. Soil-pipe interaction due to tunnelling: comparison between Winkler and elastic continuum solutions[J]. Géotechnique, 2005, 55(6): 461-466.
[2]
MARSHALLA M, KLARA, MAIRR J. Tunnelling beneath buried pipes: view of soil strain and its effect on pipeline behavior[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(12): 1664-1672.
WUZ, YAOL F, CHENX L, et al. Numerical analysis on the influence of the foundation pit excavation on the vertical deformation of subjacent pipelines[J]. Science Technology and Engineering,2021,21(7) : 2843-2849.(in Chinese)
[5]
ZHANGC, ZHUJ, HUANGM, et al. Winkler load-transfer analysis for pipelines subjected to surface load[J]. Computers and Geotechnics, 2019, 111: 147-156.
[6]
FENGG H, CHENQ S, XUC J, et al. Improved theoretical solution for estimating the tunnel response due to overlying deep excavation [J]. Sustainability, 2023,15(3),2589-2605.
[7]
LOGANATHANN, POULOSH G. Analytical prediction for tunneling-induced ground movements in clays[J]. Journal of Geotechnical & Geoenvironmental Engineering, 1998, 124 (9): 846-856.
[8]
ATTEWELLP B, YEATESJ. SELBY A R. Soil movement induced by tunnelling and their effects on pipelines and structures[M]. London: Blackie and Son Ltd., 1986:128-132.
ZHANGC R, YUJ, HUANGM S. Responses of adjacent underground jointed pipelines induced by tunneling[J]. Chinese Journal of Geotechnical Engineering, 2013, 35 (6): 1018-1026. (in Chinese)
LIH L, ZHANGC R, LUK. Nonlinear analysis of response of buried pipelines induced by tunneling[J]. Rock and Soil Mechanics, 2018,39(Sup.1): 289-296.(in Chinese)
[13]
ZHANGC, DENGP, KEW. Assessing physical mechanisms related to kinematic soil-pile interaction[J]. Soil Dynamics and Earthquake Engineering, 2018, 114: 22-26.
LINC G, HUANGM S. Deflections of discontinuous buried pipelines induced by shield tunnelling based on Pasternak foundation[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(7): 1200-1207.(in Chinese)
KEW H, GUANL X, LIUD H, et al. Research on upper pipeline-soil interaction induced by shield tunneling [J]. Rock and Soil Mechanics, 2020, 41(1): 221-228, 234-241.(in Chinese)
ZHANGL G, LOUJ Y, FENGG H, et al. Study of deformation of existing jacking pipeline induced by tunneling underlying considering residual jacking force [J]. Science Technology and Engineering, 2022,22 (35): 15784-15791.(in Chinese)
LIUJ W, SHIC H, LEIM F, et al. Analytical method for influence analysis of foundation pit excavation on underlying metro tunnel [J]. Journal of Central South University (Science and Technology),2019, 50(9): 2215-2225.(in Chinese)
TANGX. Simplified method for evaluating deformation of adjacent existing tunnel induced by foundation-pit-excavation [J]. Railway Standard Design,2023,67(5):80-87.(in Chinese)
ZHANGD M, HUANGZ K, LIZ L, et al. Analytical solution for the response of an existing tunnel to a new tunnel excavation underneath[J]. Computers and Geotechnics, 2019, 108: 197-211.
[35]
FENGG, XUC, LIANGL, et al. Simplified method for evaluating the response of existing tunnel induced by adjacent excavation [J]. International Journal for Numerical and Analytical Method in Geotechnical, 2023, 47: 54-81.
[36]
TANAHASHIH. Formulas for an infinitely long Bernoulli-Euler beam on the Pasternak model[J]. Journal of the Japanese Geotechnical Society, 2004, 44(5): 109-118.