应用离散元法分析采矿引起厚松散层变形的特征

介绍了利用离散元法模拟分析从采集到基岩垮落至厚松散层变形的过程,分析了厚松散层的变形特征与开采充分度、采厚、松散层厚度和松散层岩性等的相关关系。认识到对永久性非充分采动,相关建筑物保护煤柱可适当减小。厚松散层内部移动边界有明显的曲线特征,应选用分段或曲线形式设计建筑物保护煤柱。厚松散层厚度越大则移动角越小,一次采高大则松散层变形量大。

Deformation characteristics of the thick unconsolidated layers due to mining by UDEC

A simulation analysis with the UDEC (universal district element code) on the deformation process of the thick unconsolidated layers and the overburden due to mining was presented in this paper. Through the simulation analysis, deformation characteristics of the thick soil layers were studied. And the relations between the deformation and the parameters such as mining height, ratio of supercritical mining, thickness and the features of the unconsolidated layers were mainly studied . According to the studies, the size of the protection pillar under buildings can be reduced for the permanent non supercritical mining. The boundary of subsidence and deformation in the thick soil layers is a obvious curve. So to determine the size of the pillar,the mode of section by section or curve boundary is recommended. The thicker the layers, the smaller the overburden movement angle is. Accordingly the bigger the once mining height,the bigger the deformation of the layers is.