基于DDA模型采空区围岩在地下水循环流场作用下应力变化规律研究
A Study on Stress Variation Law of Goaf Surrounding Rock Under the Action of Groundwater Circulation Flow Field on DDA Model
汤宜洋 1刘小照 1王伟 2吴云雷 1王瑞良 1包民伟 1张大志 1耿爽 1黄磊 1黄泽楷 1张兴周1
作者信息
- 1. 河南省第一地质勘查院有限公司,河南 郑州 450001
- 2. 中国地质大学(武汉),湖北 武汉 430074
- 折叠
摘要
以三门峡市渑池县煤矿采空区为研究对象,运用DDA(Discontinuous Deformation Analysis)方法对采空区裂隙岩体进行渗流应力耦合分析计算,创建煤矿采空区离散介质岩体水力学模型,模拟计算了不同工况下地下水循环流场对采空区围岩应力变化状况.研究结果表明,当隔水层被破坏后,顶板水沿裂隙通道涌向采面,采空区围岩压力变化与增加回头压力呈线性关系;在地下水抽-注水循环过程中围岩压力与地面沉降也存在线性关系,长期循环这一过程,采空区围岩存在垮塌和含水层再造现象.
Abstract
The research project takes a goaf of Mianchi County of Sanmenxia City as the research object.On DDA(Discontinuous Deformation Analysis)method,the seepage stress coupling analysis and calculation of the fractured rock mass in the goaf are carried out,and a discrete medium rock mass hydraulic model is created for the goaf.The model simulates and calculates the stress changes of the surrounding rock in the goaf caused by the groundwater circulation flow field under various conditions.The research results indicate that when the waterproof layer is destroyed,roof water flows into the mining face along fracture channels,and the change in surrounding rock pressure in the goaf is linearly related to the increase in back pressure.There is also a linear relationship between the surrounding rock pressure and ground settlement during the groundwater pumping water reinjection cycle.During the long-term cycle,there is a phenomenon of collapse and aquifer reconstruction in the surrounding rock of the goaf.
关键词
采空区/围岩/应力场变化/流场特征Key words
Goaf/Surrounding rock/Stress field variations/Flow field characteristics引用本文复制引用
出版年
2024
NETL
NSTL
万方数据