宁东煤炭基地金凤煤矿GPS地面变形监测研究

掌握采空区地面变形规律是科学预防和治理地面塌陷的前提与基础,是煤矿地质环境动态变化的重要监测内容。以宁东煤炭基地金凤煤矿为例,在收集、了解金凤煤矿0110202和011805工作面开采时间、开采深度、开采煤厚、工作面长度、工作面宽度、工作面走向等参数的基础上,建立工作面地表自动化GPS监测点,将工作面开采进程与地面变形时间、空间统一起来,研究工作面地面变形时间和变形量的规律。结果表明,金凤煤矿011202工作面地面变形一般在采后13个月左右进入变形活跃阶段,从开始变形到地面开始稳定的持续时间为16～19个月,最大累积变形量约为3300mm;011805工作面采空区地面变形一般在采后10～11个月进入变形活跃阶段,从开始变形到地面开始稳定的持续时间为13～16个月,最大累积变形量约为2600mm。研究结果为金凤煤矿后续工作面开采地表变形规律及类似开采条件下采空塌陷的预防与治理提供了定量化的依据。

A study of GPS ground deformation monitoring of Jinfeng coal mine in Ningdong coal base

To master the law of ground deformation in the goaf is the prerequisite and foundation for scientific prevention and control of ground collapse, and also an important monitoring content for the dynamic change of the geological environment of the mine. With Jinfeng coal mine in Ningdong coal base as a study case and on the basis of collecting and understanding the mining time, mining depth, mining coal thickness, length of working face, width of working face and direction of working face, the authors set up the automatic GPS monitoring point on the surface of the working face of Jinfeng coal mine. The mining process is unified with the time and space of ground deformation. The authors tried to study the law of ground deformation time and deformation under mining and similar mining conditions. The result shows that the ground deformation of 011202 working face was usually subjected to severe deformation about 13 months after mining and reached the stability 15-17 months after the beginning of deformation, with the maximum cumulative variable being about 3300mm. The ground deformation in the goaf of 011805 working face usually occurred violently 10-11 months after mining and reached the stability 13-16 months after the beginning of deformation, with the maximum cumulative variable being about 2600mm. The research results provide quantitative basis for the prevention of surface subsidence and the prevention and treatment of gob collapse under similar mining conditions.