Application of 3D Advanced Prediction for Shield Tunnels Based on TST Method
Due to the influence of strong interference,segment lining and cutterhead struc-ture,the traditional seismic wave method in shield tunnel is confronted with ever greater limitations.To solve the difficulties in 3D seismic wave construction and the seismic sources selection in the shield construction tunnel,the 3D advanced geological prediction technology based on tunnel seismic tomography(TST)method is applied.Using comparison experi-ments and case study,the design and 3D observation system in shield tunnel of common seis-mic sources are carried out.The 3D seismic wave advanced prediction case in shield tunnel of a river-crossing channel project is studied,then the prediction results are tested.Double comparison,verification of tunneling parameters and slag samples show that:1)the 3D ar-ray based observation system of segment lining optimization,data acquisition in parallel with shield construction can save 2 hours of construction time;2)when the controlled shock source used in the shield construction tunnel,the source parameters testified with a repeti-tion frequency of 1～25 Hz and a shock duration of 100 s;3)3D advanced prediction in the shield construction tunnel of a river-crossing channel project improves the construction effi-ciency of the roadheader and its adaptability to geological conditions,providing a positive ref-erence for subsequent advanced disposals and other construction processes such as advanced treatment.
万方数据
维普
