煤层底板断裂突水时间弱化效应机理的仿真模拟研究——以开滦赵各庄煤矿为例

Trial Analyses and Numeric Simulations of Water-bursting Time-effect under Coal Bed

采用现场地应力实测、室内不同含水量情况下的断裂带物质的单轴、三轴常规和流变力学试验以及弹塑性三维可视化数值仿真模拟(FLAC^(3D))等研究,获得了断裂带物质弱化效应力学参数,阐述了其弱化机理和主要控制因素,提出了煤层底板断裂构造实水时间弱化效应的新概念。对赵各庄矿13水平(—1100m)F_8断层破碎带穿越的首采区安全回采方案做出了预测和评价。

In the light of safe mining evaluations for the first mining district which is cut by fault F8 in the thirteenth mining level in the Zhaogezhuang coal mine, Kailuan, this paper adopts such methodology as measured ground stress, traditional and special rheological rock mechanics experiments, and three-dimensional visual numeric modeling using FLAC3D. A lot of weakening effect mechanics parameters of fault materials have been obtained. The paper also discusses their weakening effect mechanisms, controlling factors, and presents a new concept of the time weakening effect of fault materials under coal bed. The concept develops and enriches basic theory of water-bursting in coal mine. As a result, different safe mining schemes for the first mining district at the thirteenth level in Zhaogezhuang mine have been predicted and evaluated.