A STUDY ON THE INFLUENCE OF CAST-IN-PLACE TUNNEL LINING CONCRETE OVER THE SURROUNDING GROUND

Abstract

  The cast-in-place lining method has been applied in these years to the case where both of the mountain tunnel method and the shield tunnel method might be adopted. In this method, the concrete is directly cast into the tail void and therefore the surrounding ground is influenced by the concrete casting pressure. The present paper considers the relationship among the casting pressure, the casting volume and the ground displacement and proposes a simple model of the method by introducing the elastic and plastic ranges of deformation. Furthermore the comparison of the calculated values of the ground deformation by the model with the observed data is made and finally the construction control scheme of the casting pressure is discussed.