| 吕祥锋*,王振伟,王爱文.深部煤岩体保护层开采上覆岩层应力释放与转移特征的实验研究[J].实验力学,2013,28(3):340~346 |
| 深部煤岩体保护层开采上覆岩层应力释放与转移特征的实验研究 |
| Experimental Study of Stress Release and Transfer Characteristics of Overburden Rock Stratum in Coal Seam Group Protective Layer Mining |
| 投稿时间：2012-05-17 修订日期：2012-11-30 |
| DOI：10.7520/1001-4888-12-069 |
| 中文关键词: 煤层群 间隔式保护层开采 被保护层 应力释放与转移 实验研究 |
| 英文关键词:coal seam group interval-type protective layer mining protected coal seam stress release and transfer experimental study |
| 基金项目:国家重点基础研究发展规划(973计划)项目(2010CB226803);国家自然科学基金项目(51174170, 51274122) |
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| 中文摘要: |
| 煤层群保护层合理开采及了解其上覆岩层应力释放和转移特征是考察保护层开采效果的重要途径。对煤层群保护层开采卸压机制进行了分析,得出间隔保护层开采卸压方式可使上、下被保护层双向卸压重叠(即保护层开采上、下双向应力释放,开采影响范围相互叠加),煤层卸压效果较好。采用相似材料模拟和数值计算相结合的研究方法,对煤层群保护层开采卸压过程进行研究,分析保护层开采上覆岩层及被保护层应力释放与转移特征。研究结果表明,应力的积聚、释放和转移过程也伴随着岩层的变形,应力呈现出“增加-减小-再增大-再降低-平稳”过程,其变形呈现出“增加-急剧减小-再增加-平稳”的过程;相似模拟实验结果与数值计算结果具有较好的一致性,说明间隔保护层开采卸压方式可使上、下被保护层双向卸压重叠,是煤层群开采中较合理的卸压方式。 |
| 英文摘要: |
| It is an important way for investigation of protective mining results that to rationally exploit the protective layer of coal seam group and to understand the stress release and transfer characteristics of its overburden rock stratum. Pressure relief mechanism in protective layer mining of coal seam group was analyzed. Interval-type protective layer mining relief method may result in bi-directional pressure relief overlap at both upper and lower protective layer (namely, exploitation of protective layer makes the upper and lower biaxial stress release, and the mining scope superposition each other) and good pressure relief effect. Combinating both similar material simulation and numerical calculation, relief process of protective layer mining of coal seam group was studied. Results show that the process of stress accumulation, release and transfer is also accompanied by rock deformation. The stress of overburden rock stratum presents features of “increase-decrease-and then increase-further reduce-smooth”, at the same time, the deformation shows features of “increase-reduce rapidly-and then increase-stable”. Similar simulation results and numerical results present good consistency. Results suggest that interval-type protective layer mining relief method, which may result in bi-directional pressure relief overlap at both upper and lower protective layer, is a reasonable pressure relief way in coal seam group exploitation. |
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