多次开挖扰动下采空区围岩应力演化数值模拟

以邯邢地区某铁矿为研究背景,采用现场调查与数值模拟相结合的方法,运用有限元数值模拟软件MIDAS/GTS建立3阶段9矿房数值计算模型,对采空区围岩应力在多次开挖扰动下的演化规律进行了揭示。结果表明:采空区围岩应力变化是一个动态过程,在多次开挖扰动影响下,相同水平和不同水平矿房开挖后都会产生应力相互扰动影响,其中本矿房开挖对相邻矿房和对角矿房扰动作用明显。第一水平开挖后矿房间柱为承压区、底板为卸压区;第二水平开挖后,第一水平矿房顶板出现承压区,两个水平垂直相邻矿房矿柱由卸压区变为承压区;第三水平开挖后,三个水平相邻矿房间柱由承压区变为卸压区。

Stress Evolution Numerical Simulation of Goa f Surrounding Rock under Repetitious Excavation Disturbance

Taking an iron mine in Handan -Xingtai district as research object and adopting the combined method of field investigation and numerical modeling , the stress evolution law of goaf sur-rounding rock under repetitious excavation disturbance is revealed by using finite element numerical simulation software MIDAS/GTS to build a numerical model of three stage nine stope .The results showed that: the stress of surrounding rock was changing all the time , and the different stopes could produce interaction effects between the same and different levels under repetitious excavation disturbance .In addition , the stope had an obvious disturbance effect on its adjacent stope and di-agonal stope .The barrier pillar became pressure area and the sill pillar became relief area after the first level excavation;when the second level excavation was completed , the pressure area appeared on crown pillar of the first stope , and the relief area on pillars of vertical adjacent stope became pressure area between the first and second levels;after third level excavation , three pillars of adja-cent stope changed from pressure area to relief area .