Uncertainty Analyses Of Responses Of Existing Pipelines To Shield Tunneling Based On BIM-numerical Simulation Integration Technique

With the rapid development of network technology,the BIM technology has become more and more widely used due to its visualization,construction,operation and maintenance,especially in the geotechnical engineering with high risk factors and invisibility.However,as there is few data conversion channels for BIM software and geotechnical engineering software,the BIM modeling and engineering calculation modeling has to be executed separately,which makes the calculation time-consuming.The purpose of this paper is to carry out secondary development of BIM software,build BIM modeling and engineering calculation integration technology,and apply this novel technology to the uncertainty analysis of the effect of shield tunneling on neighboring pipelines.Meanwhile,the technology will lay a theoretical foundation to build a visualized quantitative assessment and early warning management platform of catastrophic risks of urban infrastructure.Following analyses have been undertaken:?1?Write a data conversion interface program between BIM software and geotechnical calculation software.As the models generated by BIM software REVIT and FLAC³DD are totally different,REVIT cannot be directly inserted into FLAC³DD currently.As interface program between ANSYS and FLAC^3Dis relatively mature,this analysis uses the REVIT API to carry out secondary development of the interface program,and import the model of ANSYS into FLAC³DD to conduct the numerical modeling,which fulfills combination of BIM modeling and engineering calculation.The application example indicates that the developed REVIT-ANSYS-FLAC³DD interface program runs stably,avoiding the repetition of BIM modeling and engineering calculation modeling,and greatly improving the analysis and management efficiency.?2?The deterministic analysis was carried out based on the integration of BIM modeling and engineering calculation technology.The influence of soil parameters and construction parameters on the additional response of adjacent underground pipelines and strata caused by shield tunnel construction was studied.The result shows that,the grouting pressure has a greater influence on the underground pipelines and surface settlement,and the force of the face support has a greater influence on the bulging ahead.If the pipelines are vertical,the settlement curve of the underground pipeline caused by the tunnel excavation is similar to the peck curve.If the pipelines are parallel,the maximum shear stress in front of the excavation surface increases with the increase of support pressure,and decreases with the increase of support pressure.?3?Based on the BIM modeling and engineering calculation integration technology and the stochastic finite element method,the uncertainty analysis was carried out to study the influence and degree of the spatial variability of soil parameters and the uncertainty of supporting force and grouting pressure on additional response of underground pipelines.The analysis results show that,the spatial variability of soil parameters obeys the lognormal distribution,the maximum settlement value of the pipeline obeys the lognormal distribution,and the maximum settlement value of the pipeline obeys the normal distribution while the grouting pressure obeys the normal distribution and lognormal distribution.