浅部采空区覆岩应力变形破坏的工程地质分析及有限元模拟

ENGINEERING GEOLOGICAL ANALYSIS AND FINITE ELEMENT SIMULATION OF STRESS-STRAIN FAILURE OF ROCKMASS ABOVE THE MINED-OUT AREA AT SHALLOW DEPTH

本文通过工程地质分析和弹塑性有限元模拟,对浅部采空区上岩体内应力分布、岩体移动变形破坏规律及它们与工程地质条件的关系进行了研究。作者把采动岩体内主应力分布划分成五个区,认为岩体的整体移动主要受坚硬岩层控制,覆岩破坏高度受岩体成层性和软弱岩层的控制。有限元计算的移动变形值及覆岩破裂高度与实测资料基本一致,这对新采区岩移预计具有一定的参考价值。

Based on engineering geological analysis and elastic-plastic finite element simulation,this paper investigates rules of stresses distribution in rockmass above the mined out area at shallow depth and rules of deformation and failure of the rockmass and their relations with engineering geological conditions.The main stress distribution in rockmass after mining is divided into five areas.It is considered that the integral movement of rockmass is chiefly controlled by strong rock strata and the failure height is controlled by lamination of rockmass and weak layers.The deformation values and fractured height of overlying strata calculated by finite element method are basically in coincidence with measured data.This is useful in prediction of strata movement in a new mining section.