矩形顶管施工对天然气管道的影响及保护措施OA

Drawing on engineering case studies,this pa-per examines the influence of rectangular pipe jacking working shaft excavation and the jacking construction process on adjacent natural gas pipelines.A geotechni-cal finite element software package was employed to simulate pipeline deformation induced by rectangular pipe jacking construction,yielding predictions of hori-zontal displacement and vertical settlement.During the actual rectangular pipe jacking,the measured vertical settlement of both the Second West-East Gas Pipeline and urban high-pressure natural gas pipelines exceed-ed the simulated values.The primary causes are that the numerical model fails to account for ground loss arising from the annular gap between pipe segments and surrounding soil,and that it cannot fully capture the spatial heterogeneity of in-situ geological condi-tions.In practice,protective measures including pre-cise positioning of natural gas pipelines,strict control of vertical clearance,strategic placement of monitoring points,and establishment of designated pipeline protec-tion zones,were implemented.Complementary emer-gency measures,such as grouting through pre-installed holes in pipe segments and surface grouting,ensured stable pipeline operation and achieved satisfactory pro-tection outcomes.