【摘要】 选择合理方法,对深部煤层巷道帮部软弱煤岩锚杆(索)支护合理性进行评价,具有重要的工程实用价值。选择煤岩变形等速阶段变形速度值作为评价指标,在确定深部煤层巷道帮部锚杆锚固区、锚索锚固区以及帮部煤岩变形不同区段煤岩承载力得到充分发挥时的等速阶段变形速度合理取值基础上,通过监测深部煤层巷道帮部不同区段煤岩变形随时间演化特征,分析不同区段等速阶段软弱煤岩变形速度值,并与合理值比较,来评价锚杆、锚索支护参数的合理性,进而选择合理的支护参数。在煤岩变形早期,即可判别支护合理性,并能及时进行支护参数调整,在保证安全的基础上,使支护成本最低。更多还原

【Abstract】 Selecting a reasonable method to evaluate the support rationality by bolt(cable)in the soft coal and rock strata in deep coal roadways side section has an important engineering practical value.In this paper,the authors chose the deformation velocity of coal and rock at constant velocity deformation stage as the evaluation index,based on the reasonable value of deformation velocitys of deep coals and rocks in different sections of bolt anchorage area,cable anchorage area and roadway’s side section in constant phase of their carrying capacities being fully utilized,the authors analyzed the deformation velocity values of soft coal and rock strata of different sections in the constant velocity stage and compared with the reasonable values by monitoring the deformation evolution characteristics of deep coal and rock strata in different sections of the roadway’s side with time-varying,in order to evaluate the rationality of bolt and cable support parameters,then chose the reasonable support parameters.In the early deformation of coal and rock strata,the reasonability of support could be judged,and support parameters could be adjusted in time,which could ensure the safety and minimize the support cost.更多还原