Study on the Mechanical Characteristics of Tunnel Construction under the Support of 150 m Super Long Pipe Curtain
Based on a shallow buried expressway tunnel project,the finite element numerical simulation method was adopted to analyze the stress and deformation law of the supporting structure during tunnel construction under the two supporting systems of super-long pipe curtain and advanced small pipe.The result shows that,the maximum settlement of the vault of the pipe curtain support is 3.55 mm,the peak tensile stress of the primary support structure is 2.19 MPa,and the maximum pressure of the surrounding rock is 2.06 MPa.The stability of the surrounding rock and the supporting structure meets the requirements of construction safety,and the deformation and stress state of each supporting structure are in a stable state.Compared with the advanced small pipe support measures,the pipe curtain support system has obvious resistance to the deformation of the surface and surrounding rock.
shallow buried underneathsuper-long tube curtainsurrounding rock deformationconstruction stepsscheme comparisonstructural safety
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