By Sheng-Qi Yang
This booklet has following exact good points that distinguish it from different works from a similar sector: 1) Investigates the impression of fissure geometry on energy failure and crack evolution behaviour of actual rock fabric; 2) Analyzes the impact of pre-experiment high-temperature therapy on fracture mechanical behaviour of rock fabric with a unmarried fissure or parallel fissures; three) Compares quantitatively simulated effects utilizing discrete point modelling and experimental result of fracture mechanical behaviour of rock fabric with fissures; four) Constructs the connection among crack evolution methods and acoustic emission distribution of pre-fissured rock fabric lower than whole deformation; and five) Discusses the crack evolution mechanism of pre-fissured rock fabric with admire to diverse confining pressures. This booklet can develop into the reference for technicians within the box of geotechnical engineering, mining engineering and geology engineering. whilst, this ebook may be considered as a very good reference for medical researchers engaging in fissured rock mechanics and correlated specialties.
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Extra info for Strength Failure and Crack Evolution Behavior of Rock Materials Containing Pre-existing Fissures
06 × 10−3), crack 6 (crack type II) occurs very fast. 09 × 10−3. 9 MPa in an almost constant axial strain. 21 also presents the influence of real-time crack coalescence on the strength and deformation failure behavior of sandstone specimens containing a single fissure (2a = 15 mm, α = 15°) under uniaxial compression. 17. 21 take place before peak strength, which results from the difference of fissure length and angle in the specimen. 21, we can also analyze real-time crack coalescence process of sandstone specimen containing a single fissure (2a = 15 mm, α = 15°).
For flawed specimens with lower angle (α = 15°), the AE events are not very active and AE counts are very rare except for 34 2 Experimental Investigation on Strength Failure … several larger AE peak values. However, for flawed specimens with larger angle (α = 60°), the AE behaviors are approximately the same as that with lower angle (α = 15°) at the stage of elastic deformation, while the AE counts at the stage of crack growth and propagation are more and denser than that with lower angle (α = 15°).
Notice, the quiet period corresponds to the stage of fissure closure, therefore the AE events are not very active and the AE counts are also very rare compared with the active period, which results from only occurrence of fissure closure at this stage. Moreover, we can see that for hard and brittle sandstone material, the AE behavior at quiet period is not dependent on the fissure geometries, including fissure length and fissure angle. , the stage of elastic deformation, and the stage of crack growth and propagation.