综合机械化固体充填开采控制覆岩变形的力学分析

Mechanics Analysis of Applying Solid Stowing to Controlling Surrounding Rock Deformation with Full-mechanized Equipment

建立固体充填开采下覆岩变形的对称层合板模型,提出模型的定解条件,得到覆岩变形的解析解。采用FLAC建立充填开采覆岩运动的数值计算模型,系统研究充填体密实度、煤层采厚和采深对覆岩变形的影响变化规律。研究表明:采厚和采深对覆岩变形的影响均呈现线性关系;充填体密实度对覆岩变形的影响更为明显。当密实度η<75%时,覆岩变形较大;当密实度η>75%时,覆岩变形量显著减小。研究结果可为固体充填开采理论研究与工艺设计提供参考。

By setting up symmetry laminate model of surrounding rock deformation in solid-stowing mining and presenting definite con- dition, analytical solution of surrounding rock deformation was obtained. Applying FLAC to building up numerical simulation of stowing mining model, the influence of stowing body＇s dense, mining height and mining depth on surrounding rock deformation was re- searched. Results showed that influence of mining height and depth on surrounding rock deformation took on linear relationship. The in- fluence of stowing body＇s dense on surrounding rock deformation was more obvious. When dense η〈75%, deformation was large, and when it was minor than 75%, deformation largely reduced. Research result could provide reference for solid stowing mining theory and technique design.