浅埋软岩厚煤层导水裂隙空间特征及发育机制模拟研究

Simulation Study on Spatial Feature and Development Mechanism of Water-flowing Fractured Zone in Shallow Buried Soft Thick Coal Seam

以某煤矿为例,对浅埋软岩厚煤层导水裂隙空间发育特征及发育机制进行相似模拟研究。实验结果表明:覆岩空间结构只存在垮落带和裂隙带,浅埋软岩厚煤层回采时直接顶初次破坏时为剪切破坏;基本顶初次破坏时以弯曲破坏为主,剪切破坏为辅;基本顶周期破坏时,纵向上以弯曲破坏为主,剪切破坏为辅,走向方向上为剪切破坏。

Based on similar material model, study the development feature and mechanism of water- flowing fractured zone. According to the actual results of the mining model,overlying strata only exists caving and fractured zone. Through summarizing the mining characteristics of shallow buried soft thick coal , got the failure mode：immediate roof first damage for the first mining is the shear failure; basic roof first damage for the first time is given priority to with bending failure, shear failure is complementary; basic roof periodic damage is given priority to with bending failure, shear failure is complementary on the longitudinal, shear failure on the strike direction.