(1. School of Environment and Architecture，University of Shanghai for Science and Technology，Shanghai 200093，China；
2. Key Laboratory of Urban Underground Engineering of Ministry of Education，Beijing Jiaotong University，Beijing 100044，
China；3. Zhejiang University City College，Hangzhou，Zhejiang 310015，China；4. State Key Laboratory for Track
Technology of High-speed Railway，Railway Engineering Research Institute，China Academy of Railway Sciences，Ministry
of Land and Resources，Beijing 100081，China；5. College of Environment and Civil Engineering，Chengdu University of
Technology，Chengdu，Sichuan 610059，China)
Abstract：Lots of research results of the impact of circular shield tunnel construction have been obtained，but there are few studies on the impact of quasi-rectangular shield tunnel construction. Based on the convergent deformation mode of the excavation face of the quasi-rectangular shield tunnel，an analysis method of the free field displacement of the surrounding soil around the quasi-rectangular shield tunnel was proposed by the mirror method，and a simplified calculation method of the deformation of adjacent pipelines induced by quasi-rectangular shield tunnel excavation was proposed based on the Winkler foundation model and by applying the free displacement field of the soil to the underground pipeline structure. Through the analysis of engineering examples，the free field deformation of the soil was compared with the measured data. At the same time，the finite element numerical simulation method was used to compare the calculation results of the vertical deformation of the pipeline with the simplified method. In addition，the key parameters of the long side width of the tunnel，the depths of the tunnel and the pipeline，the diameter of the pipeline，the elastic modulus of the pipeline，the compressive modulus of the soil and soil loss parameter were analyzed. The results show that the free field displacements calculated by the mirror method adopting the global free field settlement model of the quasi-rectangular shield excavation face are consistent with the measured values and that the theoretical calculations of the adjacent pipeline deformation by the simplified method are in good agreement with the numerical simulation results. Parameter analysis indicates that the pipeline deformation is sensitive to the long side width of the tunnel rectangle，the buried depth and the elastic modulus of the pipeline. The groove width of the pipeline deformation curve increases significantly with increasing the width of the long side of the shield rectangle，and the pipeline deformation respectively increases and decreases significantly with increasing the pipeline depth and the elastic modulus of the pipeline.
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2019, Vol. 38 
