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Anti-cracking Design for a Tunnel on the Lintong Line of Xi′an Metro Crossing Ground Fissures and Fault Zones
(1 School of Geological Engineering and Surveying & Mapping Engineering，Chang′an University, Xi′an 710054; 2 Key Laboratory of Western Mineral Resources and Geological Engineering, Ministry of Education, Xi′an 710054; 3 China Railway Southwest Research Institute Co. , Ltd. , Chengdu 611731)
Abstract Based on the Lintong line of Xi′an metro crossing ground fissures and fault zones, the characteristics of ground fissure and active fault zone intersecting with the Lintong line were analyzed, the predicted and designed maximum vertical displacements of ground fissures in the design life of 100 years were determined. Considering the three-dimensional displacement relationship of the segmented metro tunnel, the three-dimensional reserved displacements of the anti-cracking structure were calculated. In view of an analysis on seismic risk near field and at field as well as the two movement patterns of active fault zone, i.e. creep slip and stick slip, the maximum surface vertical displacements induced by the activity of Lishan fault were estimated by empirical formula, and the reserved displacements of 500 mm were suggested.
Abstract：
Based on the Lintong line of Xi′an metro crossing ground fissures and fault zones, the characteristics of ground fissure and active fault zone intersecting with the Lintong line were analyzed, the predicted and designed maximum vertical displacements of ground fissures in the design life of 100 years were determined. Considering the three-dimensional displacement relationship of the segmented metro tunnel, the three-dimensional reserved displacements of the anti-cracking structure were calculated. In view of an analysis on seismic risk near field and at field as well as the two movement patterns of active fault zone, i.e. creep slip and stick slip, the maximum surface vertical displacements induced by the activity of Lishan fault were estimated by empirical formula, and the reserved displacements of 500 mm were suggested.
.Anti-cracking Design for a Tunnel on the Lintong Line of Xi′an Metro Crossing Ground Fissures and Fault Zones[J] MODERN TUNNELLING TECHNOLOGY, 2018,V55(6): 144-151
2018, Vol. 55 