DYNA Numerical Experiment on Long-Term Stability of Strip Pillar in Deep Mine

Abstract:

The creep test of the No. 3 coal seam of Daizhuang Coal Mine is carried. Based on the experiment results, the creep support effect of deep pillar is analyzed with LS-DYNA. The results show that the circumferential initial creep stress of the tested coal is 3.061MPa and the circumferential initial creep stress is far below the axial initial creep stress which is 7.020MPa. In addition, the creep strength is 9.3266MPa and the creep coefficient is 0.6472. According to the test results, the creep support effect of deep strip pillar can be simulated excellently with LS-DYNA. Stress and deformation in simulated strip pillar show evident rheology. Many changes will take place in the stable situation of pillar after the working face mining. Under the effect of the overlying strata, this pillar turns into steady creep state after 15~16 months, then the pillar is able to maintain long-term stable state.

• Periodical: Advanced Materials Research (Volumes 217-218)
• Pages: 1520-1524
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.217-218.1520
• Online since: March 2011
• Authors: Chun Qiu Wang, Shi Bin Gu, Zhong Ju Wei, Bo Li, Shao Jie Chen
• Keywords: Creep Support Effect, Creep Test, Deep Pillar, LS-DYNA, Numerical Experiment

References

[1] Grey R E, Plus R W. Surface Subsidence above Abandoned Mines [A], Symposium of The First International Mining Conference [C]. Beijing: Coal Industry Press, (1982).

[2] Van Der Merwe J N. South African coal pillar database [J]. Journal of the South African Institute of Mining and Metallurgy, 2006, 106 (2): 115-128.

[3] Yang Jing, Mao Xianbiao, Liu Ning. Viscoelasticity Analysis of Coal Pillar in Strip Mining [J]. Blasting, 2007, 24: 212-215.

[4] Yang Weifeng, Xia Xiaohong, Huang Zhican, etc. Experimental Simulation and Numerical Analysis of Partial Extraction Pillar Stability [J]. Coal Geology of China, 2005, 17 (2): 29-31.

[5] Zou Youfeng, Chai Huabin. Research Status of Strip Coal Pillar Stability and Its Main Problems in China [J]. Journal of Mining & Safety Engineering, 2006, 23 (2): 141-150.

[6] P K KAISER, C A TANG. Numerical Simulation of Damage Accumulation and Seismic Energy Release During Brittle Rock Failure-Part II: Rib Pillar Collapse [J]. International Journal of Rock Mechanics & Mining Sciences，1998, 35 (2): 123-134.

DOI: 10.1016/s0148-9062(97)00010-7

[7] Chen Shaojie, Guo Weijia, Yang Yongjie. Research on Stability of Strip Coal Pillar Based on Laboratory Test [J]. Rock and Soil Mechanics, 2008, 29 (10): 2678-2682.

[8] Shang Xiaojiang, Su Jianyu. ANSYS/LS-DYNA Dynamic Analysis Method and Engineering Examples [M]. Beijing: China Water Resources and Hydropower Press, (2006).

[9] Tan Tjong-kie, Kang Wenfa, Huang Jiefan. On the Locked in Stress, Creep and Dilatation of Rocks, and the Constitutive Equations [J]. Chinese Journal of Rock Mechanics and Engineering, 1991, 10 (4): 299－312.

[10] Li Shiping. A Concise Course in Rock Mechanics [M]. Xuzhou: China University of Mining and Technology Press, (1986).

[11] Wang Lingjuan, Sha Aimin. High Temperature Performance Evaluation of Asphalt Stable Macadam Base Mixtures [J]. Journal of Beijing University of Science and Technology, 2004, 26(Supplement): 176-179.

[12] Chen Shaojie, Guo Weijia, Yang Yongjie. Experimental study of creep model and failure characteristics of coal, [J]. Rock and Soil Mechanics, 2009, 30 (9): 2595-2598 Acknowledgements This research is financially supported by NSFC (50874070)and SRFDP (200804240004, 20103718110001) and Promotive research fund for young and middle-aged scientisits of Shandong Province (BS2010NJ013) and Natural Science Foundation of Shandong (Y2008F01) and Project of Shandong Province Higher Educational Science and Technology Program(J10LE04).

DOI: 10.1016/j.ifacol.2016.10.184