松软破碎顶板变形规律分析研究

Soft Broken Roof Deformation Rule Analysis

煤层顶底板极松软,若支护不及时、强度不够时极易破坏,需对巷道进行整体支护并具有较大的支护强度。以四川省某矿S1136区段平巷为研究对象,通过现场观测结果及数据拟合,得出顶板下沉量与时间的关系呈"S"型曲线分布,并建立了一般关系表达式。根据变化速度的不同,将顶板下沉量与时间关系一般曲线分为4个发展阶段:初始发展阶段、等速发展阶段、发展速度衰减阶段和稳定阶段,并且得出曲线的形状与顶板岩层性质、支护方式、巷道埋藏深度、掘进影响程度等因素有关的结果,另外,受顶板岩层的性质不同和掘进影响程度的不同,曲线会存在缺失初始发展阶段的现象。

Soft roof and floor of coal seam could be easily damaged while support was not timely and strength was not enough,so overall support was needed for laneway with strong support strength.Took drift of S1136 section of a mine in Sichuan province as the research object,through site observation results and data fitting,the relationship curve distribution presented ＂S＂ shape was obtained between roof squat and time,and common relationship expression was established according to different changing speed.The common curve of roof squat and time relationship was divided into four stages： primary development stage,constant velocity stage,development velocity attenuation stage and steady stage.The result of curve shape were obtained related to roof rock formation property,support mode,laneway buried depth,driving effect degree and other factors.In addition,curve would lack of primary development stage influenced by different roof strata property and different driving effect degree.