Strain Field Evolution Characteristics of Free Surface during Crater Blasting in Sandstone under High Stress
Source abstract
Abstract
Considering the problems related to hard rock blasting under high in-situ stresses at large depths, we conducted crater blasting tests on sandstone specimens under three static load conditions to investigate the strain field evolution of rock blasting under high stress. The digital image correlation (DIC) technique was used to monitor the evolution of the strain field on the free surface. Thus, the influence of the static stress on the blasting strain field was analyzed, and the formation mechanism of cracks on the free surface was elucidated. The results indicate that a circular tensile strain zone was formed without static loading. The direction of the maximum principal strain was perpendicular to the radius, which lead to the random emergence of multiple radial tensile cracks. Under a uniaxial static loading, an elliptical tensile strain zone was formed. The direction of the maximum principal strain was perpendicular to the static loading direction. This facilitated the initiation and propagation of tensile cracks preferentially in the direction parallel to the static loading. Under an equal biaxial static loading, the initial compressive strain in the specimen reduced the increment rate of the blasting strain, and restrained the formation of surface cracks. Besides, a determination method for dynamic tensile fracture strain of rock was proposed.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: High-Velocity Impact and Material Behavior · Rock Mechanics and Modeling · Structural Response to Dynamic Loads
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China
Funding
State Key Research Development Program of China
References (29)
Show source-provided references
1. Design and construction aspect of deep tunnels10.1016/S0886-7798(01)00008-6 ↗
2. Opportunities and challenges in deep mining: A brief review10.1016/J.ENG.2017.04.024 ↗
3. In-situ stress measurements and stress distribution characteristics in underground coal mines in China10.1016/j.enggeo.2010.09.015 ↗
4. Collaborative localization method using analytical and iterative solutions for microseismic/acoustic emission sources in the rockmass structure for underground mining10.1016/j.engfracmech.2018.01.032 ↗
5. Kong, P., Jiang, L.H., Jiang, J.Q., Wu, Y.N., Chen, L.J., and Ning, J.G. (2019). Numerical analysis of roadway rock-burst hazard under superposed dynamic and static Loads. Energies, 12.10.3390/en12193761 ↗
6. Failure mechanism and coupled static-dynamic loading theory in deep hard rock mining: A review10.1016/j.jrmge.2017.04.004 ↗
7. Direct tension test for rock material under different strain rates at quasi-static loads10.1007/s00603-013-0406-7 ↗
8. Failure process and mechanism of sandstone under combined equal biaxial static compression and impact loading10.1111/str.12267 ↗
9. Effects of coupled static and dynamic strain rates on mechanical behaviors of rock-like specimens containing pre-existing fissures under uniaxial compression10.1139/cgj-2017-0286 ↗
10. Analysis of damage mechanisms and optimization of cut blasting design under high in-situ stresses10.1016/j.tust.2017.03.009 ↗
11. Cracking behavior and mechanism of sandstone containing a pre-cut hole under combined static and dynamic loading10.1016/j.enggeo.2016.08.006 ↗
12. Numerical prediction of crater blasting and bench blasting10.1016/j.ijrmms.2009.05.009 ↗
13. Numerical simulation of basting-induced rock fractures10.1016/j.ijrmms.2007.12.002 ↗
14. Effects of in-situ stresses on the fracturing of rock by blasting10.1016/j.compgeo.2017.12.004 ↗
15. Three dimensional numerical rock damage analysis under blasting load10.1016/j.tust.2013.07.007 ↗
16. Crack propagation behavior in slit charge blasting under high static stress conditions10.1016/j.ijrmms.2019.05.002 ↗
17. Fracture mechanism due to blast-imposed loading under high static stress conditions10.1016/j.ijrmms.2018.04.039 ↗
18. Experimental and numerical investigations of dynamic failure process in rock under blast loading10.1016/j.tust.2018.08.047 ↗
19. Rock-like brittle material fragmentation under coupled static stress and spherical charge explosion10.1016/j.enggeo.2017.02.016 ↗
20. Experimental study on crack formation in sandstone during crater blasting under high geological stress10.1007/s10064-019-01665-1 ↗
21. Experimental study on rock-like materials fragmentation by electric explosion method under high stress condition10.1016/j.powtec.2019.09.001 ↗
22. Investigation of the rate dependence of fracture propagation in rocks using digital image correlation (DIC) method10.1016/j.engfracmech.2015.02.021 ↗
23. Use of the digital image correlation and acoustic emission technique to study the effect of structural size on cracking of reinforced concrete10.1016/j.engfracmech.2015.06.038 ↗
24. Full-field measurement and fracture characterisations of rocks under dynamic loads using high-speed three-dimensional digital image correlation10.1016/j.ijimpeng.2017.11.011 ↗
25. Zhang, H., Nath, F., Parrikar, P.N., and Mokhtari, M. (2020). Analyzing the validity of brazilian testing using digital image correlation and numerical simulation techniques. Energies, 13.10.3390/en13061441 ↗
26. Ncorr: Open-source 2D digital image correlation matlab software10.1007/s11340-015-0009-1 ↗
27. Effect of microstructure on hydric strain in clay rock: A quantitative comparison10.1016/j.clay.2019.105244 ↗
28. A reconsideration of the extension strain criterion for fracture and failure of rock10.1007/s00603-016-1059-0 ↗
29. Examination of a rock failure criterion based on circumferential tensile strain10.1007/s000240050167 ↗