caa a22 4500 46793102X CHVBK 20180406152943.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10706-005-8352-0 doi (NATIONALLICENCE)springer-10.1007/s10706-005-8352-0 Coalescence of offset rock joints under biaxial loading [Elektronische Daten] [Omer Mughieda, Iyad Karasneh] Crack coalescence in rock masses was studied by performing a series of biaxial compresion tests on specimens made of rock-like material. Specimens of size 63.5 × 27.9 × 20.3cm, made of 72% silica sand, 16% cement (Type I) and 12% water by weight were tested. The joint inclination angle was maintained at 45°, while the offset angle i.e. angle between the plane of the joint and the line that connects the two inner tips of the joints, was changed from 0° to 90° with an increment of 15°. Three levels of lateral stress were used; 0.35MPa, 0.7MPa and 1.5MPa on each sample. HP data acquisition system was used to record the data for each sample. In each sample, four LVDTs were fixed to measure the axial and lateral displacement along the sample. The failure mechanisms were monitored by eye inspection and a magnifier to detect crack initiation and propagation. For each test, the failure surfaces were investigated to determine the characteristics of each surface. Wing cracks initiated at the tip of the joint for the low confining stress applied, while at higher confining stresses wing cracks also initiated at the middle of the joint. Secondary cracks initiated at the tip of the joint due to shear stress. Three modes of failure took place due to coalescence of the secondary and wing cracks. The bridge inclination was the main variable that controlled the mode of failure. For bridge inclination of 0°, the coalescence occured due to shear failure and for bridge inclination of 90° the coalescence occurred due to tensile failure while for the other bridge inclinations coalescence occured due to mixed tensile and shear failure. Springer, 2006 biaxial loading nationallicence coalescence nationallicence fracture mechanics nationallicence jointed rock nationallicence rock mass strength nationallicence rock mechanics nationallicence Mughieda Omer Faculty of Engineering, Department of Civil Engineering, Jordan University of Science and Technology, P.O. Box 3030, 22110, Irbid, Jordan aut Karasneh Iyad Faculty of Engineering, Department of Civil Engineering, Jordan University of Science and Technology, P.O. Box 3030, 22110, Irbid, Jordan aut Geotechnical & Geological Engineering Kluwer Academic Publishers 24/4(2006-08-01), 985-999 0960-3182 24:4<985 2006 24 10706 https://doi.org/10.1007/s10706-005-8352-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10706-005-8352-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mughieda Omer Faculty of Engineering, Department of Civil Engineering, Jordan University of Science and Technology, P.O. Box 3030, 22110, Irbid, Jordan aut NATIONALLICENCE 700 1- Karasneh Iyad Faculty of Engineering, Department of Civil Engineering, Jordan University of Science and Technology, P.O. Box 3030, 22110, Irbid, Jordan aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 24/4(2006-08-01), 985-999 0960-3182 24:4<985 2006 24 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer