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Analysis and 3D Visualization of Surrounding Rock Stability during TBM Tunnelling in Jointed Rock Masses
(1 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092;2 Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092)
Abstract The intrinsic geological characteristics of a jointed rock mass include rock mass structure, in-situ stress of the primary rock mass and groundwater, which results in unfavorable geological conditions like fracture zones, soft rocks with large deformation and zones with abundant groundwater. TBM driving in the jointed rock mass is affected by these rock mass characteristics and geological conditions, while the rock mass is disturbed by the TBM construction, leading to instability of the surrounding rock. Unfavorable factors such as improper geological exploration and inappropriate selection of TBM types can also trigger or facilitate instability of the surrounding rock. The instability of rock masses may occur in front of the excavation face or around the periphery of the tunnel, or a combination of the two. A 3D visualization model of a jointed rock mass is established to simulate TBM tunneling in jointed rock masses using the developed software package BLKLAB based on block theory. Removable blocks and key blocks of surrounding rock on the excavation face and around tunnel periphery are identified.
Abstract：
The intrinsic geological characteristics of a jointed rock mass include rock mass structure, in-situ stress of the primary rock mass and groundwater, which results in unfavorable geological conditions like fracture zones, soft rocks with large deformation and zones with abundant groundwater. TBM driving in the jointed rock mass is affected by these rock mass characteristics and geological conditions, while the rock mass is disturbed by the TBM construction, leading to instability of the surrounding rock. Unfavorable factors such as improper geological exploration and inappropriate selection of TBM types can also trigger or facilitate instability of the surrounding rock. The instability of rock masses may occur in front of the excavation face or around the periphery of the tunnel, or a combination of the two. A 3D visualization model of a jointed rock mass is established to simulate TBM tunneling in jointed rock masses using the developed software package BLKLAB based on block theory. Removable blocks and key blocks of surrounding rock on the excavation face and around tunnel periphery are identified.
.Analysis and 3D Visualization of Surrounding Rock Stability during TBM Tunnelling in Jointed Rock Masses[J] MODERN TUNNELLING TECHNOLOGY, 2018,V55(2): 36-43
2018, Vol. 55 