Research of Coupling Mechanism between Dynamic Damage of Fault Rock-Pillar and Gas Outburst in Front of Roadway

Abstract:

For the particularity of rock and gas outburst in layered composite rock mass, taking the large outburst accident of the 21st down slope at +0 horizon in Zhengzhou Daping coal mine for example, we study the dynamic response characteristics of layered system and the whole process of rock and gas outburst under explosion load based on secondary development of ABAQUS user subroutine, and then innovatively put forward the new pattern “structural surface damage reinforcement” and “ribbon outburst of rock and gas”. The results are well consistent with 10.20 accident, which indicate the coupling relationship between rock damage and gas outburst under complicated geological conditions: (1) The weak structural surface damages dramatically and easy to form high pressure and high gradient of gas enrichment zone near the tunnel face under conditions of gas damaging erosion and blasting vibration; (2) The gas will break through the rock impedance and flow rapidly which result in rock burst once high pressure gas along structural face breakdown the safe rock pillar between fault and tunnel face.

• Periodical: Advanced Materials Research (Volume 1078)
• Pages: 134-138
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1078.134
• Online since: December 2014
• Authors: Zhi Rong Wang, Ya Kun Li, Zhong Yang Han
• Keywords: Damage Reinforced Crack, Explosion Load, Primary Structural Surface, Ribbon Gas Outburst, Rock Pillar Safe Thickness

References

[1] Yu B F. The mechanism of coal and gas outburst . Beijing: China Coal Industry Publishing House, pp.1-282. (1985).

[2] Li S C, Li S C, Zhang J W, et al. Study on numerical method for the minimum rock covers of subsea tunnels. Chinese Journal of Geotechnical Engineering, Vol. 28, pp.1304-1308. (2006).

[3] Xiong H H, Lu W B, Li X L, et al. Study on blast-induced damage zone for excavation of diversion tunnel at right bank of longtan hydroelectric project . Rock and Soil Mechanics, Vol. 25, pp.432-436. (2004).

[4] Dowding C H，Aimone C T. Multiple blast-hole stresses and measured fragmentation . Rock Mechanic and Rock Engineering, Vol. 18, pp.17-36. (1985).

DOI: 10.1007/bf01020413

[5] Li L, Zhang B Q, Yang X L. Analysis of dynamic response of large cross-section tunnel under vibration load induced by high speed train. Chinese Journal of Rock Mechanics and Engineering, Vol. 24, pp.4259-4265. (2005).

[6] Wu Q, Zhu B, Liu S Q. Flow-solid coupling simulation method analysis and time identification of lagging water-inrush near mine fault. Chinese Journal of Rock Mechanics and Engineering, Vol. 30, p.93–104. (2011).

[7] Wu Q, Zhu B, Li J M, et al. Numerical simulation of lagging water-in rush mechanism of rock roadways near fault zone. Journal of China University of Mining and Technology. Vol. 37, pp.780-785. (2008).