Numerical simulation analysis on construction and operation period of pipe jacking underpassing gas station

Abstract

Pipe jacking engineering, as a non-open excavation construction method, is widely used in urban municipal engineering construction because of its small disturbance to the surrounding soil and no need to demolish existing buildings and underground structures. The pipe jacking construction of Hangzhou intake upward movement project ( Phase I ) needs to go through the gas station. In order to ensure that the construction process does not cause large deformation of the foundation soil and the oil storage tank of the gas station, the numerical simulation analysis of the disturbance response of the buried oil storage tank and the upper structure of the gas station during the pipe jacking construction and operation stage is carried out based on the finite element method. The simulation results show that: With the jacking of pipe jacking, the uplift of oil tank floor gradually increases. When DN3200 pipe jacking is under the oil tank foundation, the uplift increases greatly, and the maximum uneven settlement difference is 0.05 mm. When the pipe jacking is completed, the maximum uplift of the tank bottom plate is 0.14 mm, and no settlement occurs. The surface uplift at the business hall gradually decreases along the pipe jacking direction, and it is one side of settlement and one side of uplift. The maximum uneven settlement difference is 0.3 mm. When the pipe jacking is completed, the maximum settlement is 3.4 mm, and the maximum uplift is 0.15 mm. The normal operation stage of the water pipeline will not adversely affect the Zhipu Road Gas Station, but the fault state of the underground water pipeline (generally refers to the pipeline leakage) will cause stratum settlement and the risk of ground collapse.