(1. Department of Geotechnical Engineering，Tongji University， Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Elion Resource Group，Beijing 100024，China；4. Department of Structural Engineering，Nagasaki University，Nagasaki 852–8521，Japan)
Abstract：Through laboratory test by employing the digital image correlation method(DICM)，the laws of crack propagation and mechanism of plastic deformation of rock-like material with single crack pre-existing with various inclined angles when subjected to static loading are studied. The results show that when the inclined angle = 15° and = 30°，the position of the maximum strain is near the inner crack tip point，the new crack propagation begins at the initial crack wing，and the tension stress is the main reason of the new crack generation and propagation. With the increasing of ，when = 60° and = 75°，the strain concentration is detected at the crack tip. The main propagation mode of new cracks is secondary cracks，and the shear stress play a dominant role. There are both wing cracks and secondary cracks when = 45°. The crack initiation stress increases as increasing. The sample shows there are the minimum compression strength and the fastest crack propagation speed when = 30°. The uniaxial compressive strength of the sample with secondary cracks is significantly higher than that sample with wing cracks.
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2016, Vol. 35 
