Papers by Keyword: Pressure Tunnel

Abstract: According to the triple shear unified yield criterion, the mechanical behavior of the pressure tunnel was put forward. The calculation formulas of the radius of plastic zone were deduced with considerations of the effects of the intermediate principal stress. The results show that the intermediate principal stress effect parameter b has influences on the radius of plastic zone. With the increase of the intermediate principal stress effect parameter b, the radius of plastic zone decreases. The radius of plastic zone is increased, because of the increase of the porous hydraulic pressure.

Abstract: Following the thick-walled cylinder theory, a design progress of pressure tunnel with reinforcement concrete lining is carried out in the condition of water flow continuity. When rock consolidation grouting is adopted to increase rock mass deformation module and to decrease tunnel water leakage, the equivalent permeability coefficient is introduced to tell the influence of consolidation grouting. And the results of a certain tunnel show that the method of consolidation grouting can sharply lower the tunnel water leakage, and the quality of consolidation grouting is more important than the depth of grouting to control water leakage.