To explore the surface deformation caused by pipe jacking construction and its effects on surface buildings and structures,a case study from a pipe jacking construction site in Kunming,Yunnan was utilized.Monitoring data from the site were analyzed to study the pattern of surface deformation in water-rich,variable limestone-gravel strata. Analysis revealed that soil pressure and pore water pressure negatively correlate with the distance from the pipe jacking axis,with the impact range within 1.5 times the pipe diameter. Surface deformation typically manifests as initial subsidence,followed by uplift,and then additional subsidence.The uplift reaches its maximum when the tunnel boring machine head is directly above the monitoring point,affecting areas up to twice the depth of the pipe jacking in front of the machine and three times behind it. During pipe jacking,soil consolidation leads to partial ground subsidence.However,in limestone strata,the absence of this consolidation effect results in reduced final ground subsidence as the limestone proportion increases. This study offers a theoretical foundation for reducing the environmental impact of pipe jacking construction.
维普
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