Abstract Large deformation and large-area cracking of the primary support structure occurred during construction of the Qinggangshan tunnel on the Chongqing-Guizhou Railway passing through a red clay stratum. In order to solve these problems, a systematic analysis is conducted on the terrain conditions and the deformation process of the primary support structure of the Qingganshan tunnel, the cause and mechanism of its settlement and cracking are explored, and a comprehensive treatment is proposed that combines radial pipe -roof grouting, primary support strengthening, roof ripping and arch replacement. Practices prove that the treatment is reasonable and effective.
Abstract：
Large deformation and large-area cracking of the primary support structure occurred during construction of the Qinggangshan tunnel on the Chongqing-Guizhou Railway passing through a red clay stratum. In order to solve these problems, a systematic analysis is conducted on the terrain conditions and the deformation process of the primary support structure of the Qingganshan tunnel, the cause and mechanism of its settlement and cracking are explored, and a comprehensive treatment is proposed that combines radial pipe -roof grouting, primary support strengthening, roof ripping and arch replacement. Practices prove that the treatment is reasonable and effective.
.Mechanism Analysis and Treatment Measures for Settlement and Cracking of the Primary Support Structure in a Red Clay Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(3): 207-211
2016, Vol. 53 