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Strata behavior and control strategy of backfilling collaborate with caving fully-mechanized mining
Open Geosciences ( IF 2 ) Pub Date : 2020-08-24 , DOI: 10.1515/geo-2020-0168
Yin Wei 1 , Wang Jiaqi 2 , Bai Xiaomin 3 , Sun Wenjie 1 , Zhou Zheyuan 1
Affiliation  

Abstract This article analyzes the technical difficulties in full-section backfill mining and briefly introduces the technical principle and advantages of backfilling combined with caving fully mechanized mining (BCCFM). To reveal the strata behavior law of the BCCFM workface, this work establishes a three-dimensional numerical model and designs a simulation method by dynamically updating the modulus parameter of the filling body. By the analysis of numerical simulation, the following conclusions about strata behavior of the BCCFM workface were drawn. (1) The strata behavior of the BCCFM workface shows significant nonsymmetrical characteristics, and the pressure in the caving section is higher than that in the backfilling section. φ has the greatest influence on the backfilling section and the least influence on the caving section. C has a significant influence on the range of abutment pressure in the backfilling section. (2) There exits the transition area with strong mine pressure of the BCCFM workface. φ and C have significant effect on the degree of pressure concentration but little effect on the influence range of strong mine pressure in the transition area. (3) Under different conditions, the influence range of strong mine pressure is all less than 6 m. This article puts forward a control strategy of mine pressure in the transition area, which is appropriately improving the strength of the transition hydraulic support within the influence range (6 m) in the transition area according to the pressure concentration coefficient. The field measurement value of Ji15-31010 workface was consistent with numerical simulation, which verifies the reliability of control strategy of the BCCFM workface.

中文翻译:

回填配合放顶综采的地层行为及控制策略

摘要 分析了全断面回填开采的技术难点,简要介绍了回填结合崩落综采(BCCFM)的技术原理和优势。为了揭示BCCFM工作面的地层行为规律,本文建立了三维数值模型,并设计了一种动态更新充填体模量参数的模拟方法。通过数值模拟分析,对BCCFM工作面的地层行为得出以下结论。(1) BCCFM工作面地层行为表现出明显的非对称特征,崩落段压力高于回填段压力。φ对回填段影响最大,对崩落段影响最小。C对回填段的桥台压力范围有显着影响。(2)BCCFM工作面存在强矿压过渡区。φ和C对压力集中程度影响显着,对过渡区强矿压影响范围影响不大。(3)在不同条件下,强矿压的影响范围均小于6 m。本文提出了过渡区矿井压力控制策略,即根据压力集中系数适当提高过渡区影响范围(6 m)内过渡液压支架的强度。Ji15-31010工作面现场实测值与数值模拟一致,
更新日期:2020-08-24
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