Research On Tunneling Technology In Hard And Mix Ground By Shield Machine

Metro tunnel built by Shield tunneling method is initials from Shanghai Metro and Guangzhou Metro, and currently it is applied in the metro works of Nanjing, Shenzhen, Beijing, Tianjin, etc. Shield tunneling method is generally used for a homogeneous soft soil, soft ground or sand and its interbedding. Shield Tunnel of Dashinan—Hanxi Section for Guangzhou Metro Line 3 locally passes through slightly weathered rock, where the uni-axil rock strength reaches 113MPa, and the borehole reveals the silicified breccia with the rock strength of 156.5MPa, and interbedding of hard and soft ground is largely developed, the ground is of poor homogeneity, which is disadvantageous to the construction by shield tunneling method.Supported by the engineering project, combined with the data investigation, theory study, indoor test, site test verification, the research has executed the special study on the technologies for the adaptability of tunneling in hard ground by shield machine, management on cutters in hard ground tunneling, segment lining in long length hard ground by mine tunneling method, etc. the major innovative achievements are gained as follows:With the theoretical analysis to the rock breaking by roll-press and cutting, it provides the valuable basis for re-design and fabrication of cutter head of shield machine as well as cutter layout, conducted the...