隔水层裂隙演变机理与过程研究

Evolution Mechanism and Process of Aquiclude Fissures

以神东矿区浅埋煤层采矿地质条件为例,研究采动覆岩中软弱隔水岩层裂隙演变的力学机理与规律.在分析浅埋煤层薄基岩顶部风化带岩层的隔水性和覆岩裂隙发育规律基础上,建立平板力学模型,采用薄板理论中的差分法,应用应变分析原理,结合下伏垮冒岩层的弹性地基特性,研究了薄基岩浅埋煤层长壁工作面覆岩活动规律和软弱隔水层板的裂隙演化机理及发育过程,得到了覆岩中软弱隔水岩层破裂距离与弹性地基常数的关系,以及不同开采空间对应的极限弹性地基常数.研究成果可为我国西部干旱半干旱矿区浅埋煤层的保水开采工程实践提供理论依据.

Taking the Shengdong mining area shallowly buried seam mining geological condition for example,we study the dynamic mechanism and the rule of soft aquiclude fissure evolution in overlying strata under coal mining conditions.Based on the analysis that water-resisting property of weathering the top of shallowly buried seam with thin bedrock and the rule of overlying strata fissure,we establish the flat mechanics model using the difference method in thin plate theory,application of strain analysis theory,collapse with the underlying risk characteristics of elastic foundation rock.In addition,we also study the movement law of long wall face rock in shallowly buried seam with a thin bedrock,obtaining the relationship between soft aquiclude rupture distance and elastic foundation constants and different exploitation of space corresponding elastic foundation constant limit.The research can provide a theoretical basis for water-keeping mining shallowly buried seam in western China.