EXCAVATION EFFECT OF LARGE-SPAN DEEP BURIED LOESS TUNNEL

Deformation-failure regularity of loess and force distrubition regularity in lining of large-span deep buried loess tunnel under the other constant conditions along the whole profile during typical step excavation are studied. After revealing their excavation effects, the authors indicate the difference between these regularities are caused by the different excavation pattern, and anlyze the rational force distrubition regularity.