岩土力学 ›› 2019, Vol. 40 ›› Issue (3): 1097-1104.doi: 10.16285/j.rsm.2017.1995

• 岩土工程研究 • 上一篇    下一篇

煤矿充填开采覆岩连续变形移动规律及 曲率模型研究

左建平1, 2,周钰博1,刘光文1,邵光耀1,史 月1   

  1. 1. 中国矿业大学(北京)力学与建筑工程学院,北京 100083;2. 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京 100083
  • 收稿日期:2017-10-08 出版日期:2019-03-11 发布日期:2019-04-04
  • 作者简介:左建平,男,1978年生,博士,教授,博士生导师,主要从事裂隙煤岩破坏及本构理论方面的研究工作
  • 基金资助:
    国家自然科学基金优秀青年基金项目(No.51622404);国家自然科学基金(No.11572343);“十三五”国家重点研发计划(No.2016YFC0801404);中国矿业大学(北京)越崎杰出学者计划。

Continuous deformation law and curvature model of rock strata in coal backfill mining

ZUO Jian-ping1, 2, ZHOU Yu-bo1, LIU Guang-wen1, SHAO Guang-yao1, SHI Yue1   

  1. 1. School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China; 2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing), Beijing 100083, China
  • Received:2017-10-08 Online:2019-03-11 Published:2019-04-04
  • Supported by:
    This work was supported by the National Natural Science Foundation of China for Outstanding Youth Scholars (51622404), the National Natural Science Foundation of China(11572343), the National Key Research and Development Program of China(2016YFC0801404) and the Yueqi Distinguished Scholar Project, China University of Mining & Technology (Beijing).

摘要: 为了进一步探究充填开采覆岩移动变形规律,基于充填开采覆岩移动变形特征,给出了充填开采岩层“连续曲形梁”的定义。在分析覆岩变形与曲率关系的基础上,建立了充填开采岩层曲率模型,提出采用曲率来评价充填开采覆岩的变形特征,导出了岩层曲率K的计算公式,揭示了充实率与岩层曲率之间的关系,并分析得出充实率、采厚及关键层是影响覆岩曲率的关键因素,支架长度对覆岩曲率也有一定的影响,提出采用曲率理论模型评价充填的效果。依据不同层位高度的岩层曲率变化特征,提出以极限曲率作为岩层破断的判别标准,判断不同充实率条件下岩层破断位置,并计算了直接顶、基本顶不破断的临界充实率,结果与钻孔实测结果基本一致。

关键词: 充填开采, 覆岩移动, 曲率模型, 连续曲形梁, 充实率

Abstract: To further investigate the overburden strata movement and deformation law of coal backfill mining, a concept of “continuous curved beam” of coal backfill mining was defined based on the overburden strata movement and deformation characteristics of coal backfill mining. On the basis of analyzing relationship between overburden strata deformation and curvature, a model was established for overburden strata curvature of coal backfill mining. The curvature was proposed to evaluate the deformation characteristics of rock strata. A formula of calculating the curvature K of overburden strata was deduced to reveal the relationship between compression ratio and overburden strata curvature. Compression ratio, thickness and key strata were found to be key factors influencing overburden strata curvature according to the curvature model, meanwhile, the support length also had some effect on overburden strata curvature. Thus, the curvature theoretical model was adopted to evaluate the effect of backfill mining. According to curvature variation features of overburden strata at different layer heights, the limit curvature was proposed as the criterion to judge the fracture location of strata under different compression ratios. The critical compression ratios of immediate roof and main roof without breaking were calculated, and were basically consistent with borehole measurement.

Key words: backfill mining, strata movement, curvature model, continuous curved beam, compression ratio

中图分类号: 

  • TD 823.7
[1] 李 飞,王金安,李鹏飞,黄 坤. 山区下开采覆岩移动规律及破断机制研究[J]. , 2016, 37(4): 1089-1095.
[2] 李 铀 ,白世伟 ,杨春和 ,袁丛华 . 矿山覆岩移动特征与安全开采深度[J]. , 2005, 26(1): 27-32.
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