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.
关键词
浅埋下穿/超长管幕/围岩变形/施工步序/方案比选/结构安全
Key words
shallow buried underneath/super-long tube curtain/surrounding rock deformation/construction steps/scheme comparison/structural safety
维普
万方数据