综采工作面塑性区煤体的流变特性分析

发布时间：2018-05-19 11:52

本文选题：综采工作面 + 塑性区煤体　；参考：《煤矿开采》2017年06期

【摘要】：针对综采工作面对煤壁片帮防治的安全生产需求,运用流变力学理论,对综采工作面塑性区煤体的流变特性进行了分析,并以不同受力条件下煤体蠕变变化的动态类型为依据,对塑性区煤体的流变特性进行了分区。研究表明:塑性区煤体变形过程中,存在的不平衡滑动力是煤体开始失稳直至破坏的根本原因;不平衡滑动力与煤体长期强度的大小关系的不同,造成塑性区不同区域煤体蠕变变化分为衰减蠕变、稳态蠕变和非稳定蠕变;确定非稳定蠕变区煤体蠕变时间,能从理论上计算工作面推进速度的下限值。根据现场工作面生产地质条件对塑性区煤体的流变特性进行了分区,并通过现场实测结果分析,得出工作面煤壁片帮多发生在煤壁中上部,且工作面两端头位置片帮发生次数以及片帮尺寸均比中部大。理论分区结果与现场实测煤壁片帮部位具有较好的一致性。
[Abstract]:In order to meet the demand of safety production in the face of coal wall and cover prevention in fully mechanized coal mining, the rheological characteristics of coal body in plastic zone of fully mechanized coal face are analyzed by using rheological mechanics theory, and the dynamic types of creep change of coal body under different stress conditions are taken as the basis. The rheological characteristics of coal in plastic zone are divided. The results show that the unbalanced sliding force is the fundamental cause of the instability and failure of the coal body in plastic zone, and the relationship between the unbalanced sliding force and the long-term strength of the coal body is different. The creep changes of coal body in different regions of plastic zone can be divided into attenuation creep steady creep and unstable creep and determination of creep time of coal body in unstable creep zone can theoretically calculate the lower limit value of working face advance speed. The rheological characteristics of coal in plastic area are divided according to the production geological conditions of the working face, and through the analysis of the field measured results, it is concluded that the coal wall and the upper part of the coal wall are mostly occurred in the working face. And the number of occurrence and the size of the cover are larger than that in the middle of the working face. The results of theoretical zoning are in good agreement with the measured results.
【作者单位】：内蒙古科技大学矿业研究院;
【基金】：国家自然科学基金项目(51574220,51464036) 内蒙古科技大学创新基金项目(2017QDL-B11,2017QDL-B12)
【分类号】：TD323

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