义棠煤业100602工作面底板破坏深度研究

Study on floor failure depth of No.100602 Face in Yitang Coal Industry

为实现对义棠煤业100602工作面的保水开采,通过理论计算和现场实测研究在采动影响下煤层底板破坏带的深度。研究发现,不同深度底板应变及应力增量降幅规律趋向一致,且增量的变化幅度与深度呈负相关;底板变形呈滞后性,即工作面推进后底板不会立刻回弹,之后随着工作面逐渐远离应变恢复原岩应力状态。基于不同深度应变探头的附加应变和应力变化情况,分析得出义棠煤业100602工作面开采时的底板破坏深度为17.10~17.58 m。这一研究成果为工作面实现带压保水开采提供理论依据和安全可行性。

In order to realize the water-preserved mining of No.100602 Face in Yitang Coal Industry,the depth of coal seam floor failure zone under the influence of mining was studied by theoretical calculation and field measurement.It was found that the decrease of strain and stress increment of floor at different depths tended to be consistent,and the change range of increment was negatively correlated with depth.The deformation of the floor was lagging,that was,the floor would not rebound immediately after the working face was advanced,and then the stress state of the original rock would be restored as the working face gradually moves away from the strain.Based on the additional strain and stress changes of strain probes at different depths,the floor failure depth of 100602 working face in Yitang Coal Industry was 17.10~17.58 m.The research results provided theoretical basis and safety feasibility for the realization of water-preserved mining under pressure in the working face.