短壁开采覆岩关键层黏弹性分析与应用

根据短壁开采条件下保护煤柱的布设特点，建立由保护煤柱支承的关键层力学分析模型。针对不同采场设计参数进行关键层受力及变形的弹性和黏弹性分析，得到弹性介质关键层下沉量的理论计算式，及黏弹性介质关键层变形随时间变化的表达式。评价不同采场参数对关键层随时间变形的影响，给出理想的建筑物下短壁开采设计参数范围，为“三下”开采设计和长期地表沉陷预计提供理论依据。

VISCOELASTICITY ANALYSIS AND APPLICATION OF KEY STRATA OF COVERING ROCK TO SHORT WALL MINING

The mechanical model of key strata supported by coal pillar is set up according to the layout of coal pillars in the coalface of short wall mining. With the help of analysis of elasticity and viscoelasticity of enforce and deformation of key strata using different design parameters in different working face, the theoretical formulas of ground subsidence of elastic medium key strata and the dependence of the deformation on time of viscoelastic medium key strata are obtained. The parameter ranges of the short wall mining under buildings are proposed; and the influence of key strata on the deformation with time for different parameters are evaluated. The model provides theoretical basis for the design of short wall mining under buildings, water bodies and railways, and for the prediction of ground subsidence.