UDEC simulation results show that the porosity of overburden rock fissure field in goaf and its curve is saddle-shaped.
UDEC模拟结果表明，采空区覆岩裂隙区域孔隙率曲线呈鞍状分布。
The paper introduces a new style of loader which universally used for heading faces with heavy saddle back in roadway and weak stability of face surrounding rock.
介绍一种新型的装载机，该机能适用于巷道底板起伏变化大，工作面围岩稳定性较差的掘进工作面中使用。
The paper introduces a new style of loader which universally used for heading faces with heavy saddle back in roadway and weak stability of face surrounding rock.
介绍一种新型的装载机，该机能适用于巷道底板起伏变化大，工作面围岩稳定性较差的掘进工作面中使用。
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