Dynamic Load Response Analysis Of Underground Drainage Pipeline Based On Polymer Grouting Repair

The development of the economy and the expansion of the city-scale support to accelerated development of the recovery of the underground drainage pipeline in China.However,due to the action of traffic and earthquake load,disaster accidents in underground drainage pipes are taking place frequently,causing leakage,and fracture,which the environment and public safety seriously harm.As a new technology of recovery the disengaging of the underground pipeline,polymer grouting can quickly fill the disengaging area and compact the soil mass,however,a little of analysis is aimed to effect of polymer grouting on reconstruction disengaging pipe.For the above issues,this paper analyzes the effect that underground drainage pipeline repairs the disengaging pipe by dynamic load response and polymer grouting under the action of traffic and earthquake load.The main research contents are as follows:(1)In this paper,the new research status of underground pipeline stress and the development of non-excavation recovery and polymer grouting techniques are master.Depended on the finite element analysis theory and ABAQUS numerical analysis software,the mechanical model of the interaction between pipe and soil is established.(2)The 3D numerical model of the drainage pipeline with bell and spigot joints structure is established by ABAQUS finite element software.Writing the Dload subroutine allows realizing the application of moving vehicle loads and calculating and extracting the pipe strain,displacement and the circumferential Mises stress of bell and spigot joints after the normal embedment,bottom disengaging and grouting recovery.This paper analyzes the recovery effect of polymer grouting on the disengaging pipeline and researches the influence of different pipe buried depth,vehicle load size and vehicle speed on the dynamic response of drainage pipe.(3)According to the established finite element model,the equivalent linear analysis of seismic response is analyzed for normal buried pipe,bottom disengaging pipe and grouting recovery pipe.The output data is processed by own program,and iterative computations are done repeatedly.This paper extracts the vertical acceleration,lateral acceleration and vertical displacement time history of different working conditions and site types of pipelines(Northridge wave(type ? venue),Taft wave(type ? venue),EL-Centro wave(type ? venue),and Tianjin wave(type ? venue))and stress time history of pipe J3 steel bell maximum tensile and maximum compressive analyzes the recovery effects of polymer grouting on disengaging pipe and researches the effects of seismic waves corresponding to different types of sites on the dynamic response of drainage pipes.(4)This paper experiments the different speeds driving load of the underground drainage pipeline,and tests the pipe strain of the pipeline after normal embedment,bottom disengaging and grouting recovery,and the results are contrastively analyzed with the numerical simulation,in order to verify the rationality and accuracy of the numerical model.