Simulation Analysis of the Soft Rock Inclined Shaft Surrounding Rock Control with Different Bolt Support Patterns

Abstract:

Taking +150 inclined shaft going through the soft rock strata at Muchengjian mine as the background, and based on the analysis of the deformation and failure feature of the roadway surrounding rock in the soft rock strata, this paper makes X-Ray Differaction (XRD) phase analysis of the soft rock; using finite difference numerical software FLAC^3D, it stimulates and makes comparative analysis of the stress and deformation distribution characteristics of the roadway surrounding rock with bolt support with different intervals, and the support of the high-strength bolt with high pre-tension stress in the inclined shaft through the soft rock strata. The results show that the roadway surrounding rock in the +150 inclined shaft at Muchengjian mine is swelling soft rock prone to softening, degradation and swelling in water, which is bad for the roadway support; different types of rock strata have significant different impact on the stress and deformation of the roadway surrounding rock; for the soft rock roadway, the increased pre-tension stress of the bolt can cause higher compressive stress in the roadway surrounding rock and reduce the tension failure of the surrounding rock;compared with the end anchorage, the full-size anchorage with high pre-tension stress can cause the overlap of the conical compressive stress zone and enhance the roadway overall support.

• Periodical: Advanced Materials Research (Volume 988)
• Pages: 377-382
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.988.377
• Online since: July 2014
• Authors: Peng Fei Jiang*
• Keywords: Bolt Support, High Pre-Tension Stress, Inclined Shaft, Numerical Simulation, Soft Rock Roadway

References

[1] HE Manchao, SUN Xiaoming. Support Design and Construction of Soft Rock Roadway Engineering in Chinese Coal Mine[M]. Beijing: Science Press, 2004. 4.

[2] Kang Hongpu, Wang Jinhua, Lin Jian. Study and applications of roadway support techniques for coal mines [J]. Journal of China Coal Society, 2010, 35(11): 1809-1814.

[3] ZHANG Liang-hai, YUAN Ming-xing. Pre-stressed Bolt Anchor-truss Support Technology in Composite Roof Roadway [J]. Coal Science and Techno logy, 2009, 37(11): 18-20.

[4] KANG Hongpu, J IANG Tieming, GAO Fuqiang. Effect of pretensioned stress to rock bolting[J]. Journal of China Coal Society, 2007, 32(7): 680-685.

[5] LIN Jian, FAN Ming-jian, SI Lin-po, JIANG Peng-fei. Research on Anchored Bolt and Anchored Rope Supporting Soft and Cracked CoalRoadway under Near Gob[J]. Coal mining Techno logy, 2010, 15(4): 45-50.

[6] KANG Hongpu, WANG jinghua. Rock bolting theory and complete technology for coal roadways[M]. Beijing: China Coal Industry Publishing House, (2007).

[7] QIAO Liping, LIU Jian, FENG Xiating. STUDY ON DAMAGE MECHANISM OF SANDSTONE UNDER HYDRO-PHYSICO-CHEMICAL EFFECTS[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(10): 2117-2123.

[8] HU Bin, KANG Hongpu, LIN JIan, et al. Feasibility Test of Anchoring Sandstone Hydrated Roof of Roadway Surrounded by Soft Rock in Fengshuigou Colliery[J]. Coal Mining Technology, 2011, 16 (1): 67-70.

[9] Kang Hongpu, Jiang Tieming, Gao Fuqiang. Effect of pretensioned stress to rock bolting[J]. Journal of China Coal Society, 2007, 32(7): 673-678.

[10] JIANG Pengfei, KANG Hongpu, ZHANG Jian, et al. Study on Load-Transfer Mechanisms of the Closed Distance Coal Seam Group Mining in The Coal Pillars of Different Widths[J]. Journal of Mining & Safety Engineering, 2011, 28(3): 345-349.

[11] Wang Jinhua, Kang Hongpu, Gao Fuqiang. Numerical simulation on load-transfer mechanisms and stress distribution characteristics of cable bolts[J]. Journal of China Coal Society, 2008, 33(1): 1-6.