A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of excavation response in sedimentary rock mass
This study aimes to investigate the disturbed zone around the drift excavated in the sedimentary rock formation and to evaluate the accuracy, reliability and effectiveness of existing techniques for excavation, measurement and analysis for the use of the repository construction. For this purpose, a drift (2.5x2.5m, L=30m) was excavated by NATM. Rock mass displacement, rock bolt stress, permeability and pore water pressure were measured in and around the drift. Using this drift as measuring drift, a test drift (3.0x3.0m, L=20m) was excavated parallel to the measuring drift. As the supporting system of this drift only rock bolting was employed. In-situ measurement of rock displacement, elastic wave velocity, permeability and initial stress have been carried out. These results were compared with the predicted results to investigate the effectiveness of the existing evaluation techniques. Laboratory test results and geological mapping data were also used to understand the rock mass behavior and the disturbed zone around drift. These investigations revealed that low velocity zone of elastic wave was generated around the drift, and in the zone, permeability decreased and displacement increased. Rock mass movement was predicted roughly by numerical analysis based on the laboratory test results. And detailed numerical analysis considering the initial stress data and disturbed zone around the drift, provided good simulation of rock mass movement. (J.P.N.).
Evaluation of excavation response in sedimentary rock mass
This study aimes to investigate the disturbed zone around the drift excavated in the sedimentary rock formation and to evaluate the accuracy, reliability and effectiveness of existing techniques for excavation, measurement and analysis for the use of the repository construction. For this purpose, a drift (2.5x2.5m, L=30m) was excavated by NATM. Rock mass displacement, rock bolt stress, permeability and pore water pressure were measured in and around the drift. Using this drift as measuring drift, a test drift (3.0x3.0m, L=20m) was excavated parallel to the measuring drift. As the supporting system of this drift only rock bolting was employed. In-situ measurement of rock displacement, elastic wave velocity, permeability and initial stress have been carried out. These results were compared with the predicted results to investigate the effectiveness of the existing evaluation techniques. Laboratory test results and geological mapping data were also used to understand the rock mass behavior and the disturbed zone around drift. These investigations revealed that low velocity zone of elastic wave was generated around the drift, and in the zone, permeability decreased and displacement increased. Rock mass movement was predicted roughly by numerical analysis based on the laboratory test results. And detailed numerical analysis considering the initial stress data and disturbed zone around the drift, provided good simulation of rock mass movement. (J.P.N.).
Evaluation of excavation response in sedimentary rock mass
K. Sugihara (author) / Y. Ninomiya (author)
1990
55 pages
Report
No indication
English
Geology & Geophysics , Cartography , Hydrology & Limnology , Radioactive Wastes & Radioactivity , Sedimentary Rocks , Topological Mapping , Geology , Excavation , Frequency Response Testing , Geologic Strata , Ground Motion , Hydraulic Conductivity , Hydrology , Mechanical Properties , Radioactive Waste Disposal , Radioactive Wastes , Rock Drilling , Rock Mechanics , Underground Disposal , Foreign technology , EDB/052002 , EDB/580000
Deformation of sedimentary soft rock in deep excavation
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Stress analysis of road and spillway excavation slides in sedimentary rock
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Stress analysis of road and spillway excavation slides in sedimentary rock
| Online Contents | 1978