范各庄矿F_0断层滞后突水数值模拟

NUMERICAL SIMULATIONS OF WATER INRUSH OF FAULT F_0 IN FANGEZHUANG COAL MINE

开滦矿业集团公司范各庄矿F0断层贯穿该矿整个井田,根据现场条件获取断层带原样物质,并进行断层物质原样和复制样的蠕变力学试验,得到断层物质不同条件下的实验室数据;运用FLAC3D数值计算软件,对范各庄矿F0断层对开采的影响进行流-固耦合模拟和渗流蠕变计算,得到不同时间段采矿活动对断层的影响数据。计算表明,底板岩层垂直位移量在断层附近最大,断层的存在使底板承受较大构造应力,并存在大范围的剪应力区,断层部位的应力集中是造成底板破坏、发生底板突水的关键。模拟结果较好地刻画出承压水对上覆岩层及断层带的影响、开采活动对底板岩层的影响、断层破碎带受开采影响的大小和范围以及承压水影响的时间效应,为矿井安全生产提供可靠的基础数据。

The fault F0 of the Fangezhuang coal mine, Kailuan coal group, runs through the whole mine field. Based on the experimental results of the creep for the faults, the data of the faults under different conditions obtained. The influence of mining activity on the faults at different periods is gained through the simulation of fluid-solid coupling and the calculation of seepage creep using numerical simulations software FLAC^3D. The results indicate that vertical displacement of floor strata near the faults reaches maximum value. Large tectonic stress on the floor is caused by the faults, which leads to a wide range shear stress area at the same time. The stress concentration is the key factor of the breakage and water bursting of floor. The basic phenomena including the influence of confined water on the overlaying rock and faults, the influence of mining activity on the floor strata, the size and range of influence of the mining activity on the faults, and the time-effect of the influence on the confined water, are described by the simulation results very well, which provides reliable basic data for the safety of the coal production.