充填开采采场应力变化的数值模拟分析

The numerical simulation analysis of backfilling mining stope stress changes

充填开采对解放"三下"压煤具有重大意义,研究充填开采采场应力的变化特征对于"三下"开采具有重要意义,充填体的特性能直接影响开采采场的应力分布特征,文中以彩屯矿工业广场保护煤柱充填开采为原型,设计了三种不同强度充填体的充填开采。通过Flac3D数值模拟,得出了当采用不同强度充填体充填开采时充填体自身和围岩的应力分布特征,通过得出的应力分布特征建立了充填体压缩率与采场应力变异系数之间的函数关系。结合现场矿压监测数据,验证了该函数关系式的实用性,为充填开采中围岩变形破坏的控制和充填体强度的确定提供了科学依据。

Backfilling was important to liberate ＂three under＂ coal , research on stope stress variation characteristics of backfilling mining was of great significance for ＂three under＂ mining, Characteristics of the filling body can directly affect the stress distribution characteristics of mining stope, The protection coal pillar of Cai Tung mining industrial square was the prototype of this research, three different strength of filling body were disigned in the backfilling. The filling body and surrounding rock stress distribution characteristics corresponding to different filling strength of filling body were obtained by FlacsD numerical simulation , function relationship between the stope stress variation coefficient and the compression ratio of filling body was established by stress distribution characteristics , Combined with the pressure monitoring datas, the practicability of the function relationship was validation, Provided a scientific basis for the deformation and failure controlling of the surrounding rock and determination of the filling body strength of backfilling.