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采场覆岩空间破裂与采动应力场分布关联性研究

Study on correlation between spatial fracturing of overlying strata and distribution of mining stress field in stope

  • 摘要: 针对上覆多层坚硬砂岩组破断时释放的动载荷耦合集中静载荷区弹性应变能易诱发冲击地压显现的问题,采用现场监测、统计分析的方法,探索了覆岩空间破裂与采动应力场关联性对冲击地压显现的影响,对覆岩空间破裂分布特征及采动应力场分布特征进行了监测分析,依据研究结果对临空巷道超前支护方式进行了优化与实践验证。研究表明:纳林河二号矿井31102工作面覆岩破裂剧烈区位于3-1煤层顶板上方30.3 m,厚度为14.85 m的细粒砂岩层内,并超前工作面30~40 m;超前支承压力影响距离至工作面前方254~280 m,峰值点距工作面小于66 m。覆岩破裂剧烈区与采动应力场峰值区(两区)相距较近,易诱发冲击地压灾害,在超前工作面0~40 m两区下方的临空巷道采用垛式液压支架超前支护顶板,可有效防治冲击地压。

     

    Abstract: Aiming at the problem that the elastic strain energy in the concentrated static load zone and fracturing shock of the overlying hard rock group is easily coupling to induce rockburst,method of on-site monitoring and statistical analysis is used to explore the overlying strata spatial fracturing law and the distribution characteristics of mining stress field.The correlation on both things to influencing rockbust is monitored and analyzed. Based on the research results, the advance support pattern of gob-side roadway was improved and verified in practice.This study showed that the severe overburden fracture zone in the No.31102 working face of Nalinhe No.2 Coal Mine is in the fine sandstone layer,30.3 m above the 3-1 coal roof and 14.85 m in thickness, and is ahead of the working face by 30~40 m.The influence of the lead bearing pressure is 254~280 m in front of the working face,and the peak point is less than 66 m from the working face.The result also shows that rockburst is likely to occur when the high stress zone is close to the severe overburden fracture zone.The raft type hydraulic supports were applied in gob-side roadway,ahead of the working face in 0~40 m and under the severe overburden fracture zone.Practice showed that it plays a key role in the process of rock burst control.

     

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