Based on the in - situ measurements of ground pressure and physical and mechanical properties of rocks in guhanshan coal mine , and analysis of minerals composition and fissures in rock , the type of soft rock was determined to investigate the deformation and failure of surrounding rocks and floor heave happened in extremely soft rock roadway in guhanshan coal mine , which provides the basic news for support of rock soft 摘要针对古汉山矿软岩巷道围岩变形破坏和严重底膨问题，通过对巷道围岩进行地应力测量、物理力学性质分析测试、矿物成份分析和节理裂隙调查，确定了底膨巷道的软岩类型，这为解决软岩巷道的支护问题提供了基础。
Abstract : in this paper , the feature of time - bifurcation for plate - beam stability is studied by mechanics model of plate - beam structure of rock in compression . the instability time of plate - beam is dependent on the rock material feature . delay bulking occurs under some load . the formula of time - bifurcation is given . the mechanisms of roadway floor heave and delay rockburst are preliminarity discussed 文摘:采用岩石板裂梁的纵向受压的力学模型，考虑深部岩石的流变性，分析了板梁稳定性的时间分叉特性.板梁失稳与岩体的流变性质密切相关，在一定载荷下，经历一段时间后会发生延迟失稳，给出了时间分叉点的计算式.并对深部矿井延迟性岩爆发生机制进行了初步分析
