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Pipeline construction underneath existing highway leads to settlement deformation of the existing highway thus bringing potential security risks to highway quality and traffic safety. Taking pipeline underpassing of G93 Highway as the research object, this thesis utilizes ANSYS Finite Element Simulation Software and Mol-coulomb Criterion to establish model and realizes burial depth simulation through equivalent gravity field. Results show that vertical displacement of earthing on the top of burial depth pipeline mainly appears as vertical settlement, whose maximum value reaches 15.3mm. The maximum shearing stress value of subgrade soil is 0.051MPa. Shearing stress of materials is within the range of shearing strength. Pipeline structure right below the highway is secure. Introduction Pipeline underpasses existing structures and results in the settlement deformation thus bringing potential security risks to the quality and safety [1-3]. Baoxin Jia[4] carries out research on subgrade settlement value of cross tunnel, whose conclusion is that subgrade settlement degree of existing highway tunnel is concerned with factors of width coefficient of settling tank, internal friction angle, gradient, approaching distance of tunnel, etc. Zhao Lu [5] does research on impacts of construction method on underpassing highway tunnel. The result shows that surrounding rock deformation control effect in the case of CRD Method is better than Benching Tunneling Method and CD Method. This thesis utilizes ANSYS Software to do simulation analysis on impacts of pipeline underpassing on existing highway, which provides theoretical references for project construction. Overview of Engineering Project The proposed pipeline would cross the position from AA273 to AA274 of G93 Highway. Stake number AA273 includes X be 3330849.82, Y be 35583051.87 and H be 278.17m. Stake number AA274 includes X be 3330926.17, Y be 35583072.06 and H be 290.05m. Investigation area belongs to inter-mountain valley with sea-level elevation from 278.17m to 290.05m where topografic relief and narrow field are. It is found from engineering geological investigation that the field and periphery exclude bad geological process and geologic disaster phenomenon like landslide, collapse, ground depression and active fracture on the phase of investigation. This field is stable and suitable for pipeline crossing engineering construction. Establishment of ANSYS Analytical Model This ANSYS calculation model utilizes Mol-coulomb Rule to do analog computation. For the

Simulation Analysis on Impacts on Existing Highway from Pipeline Underpassing Based on ANSYS