摘要
针对我国承压水上开采底板突水灾害随开采深度不断增大而逐年增多的趋势,以某矿综放工作面的深部开采实际为背景,根据现场煤层底板钻孔内不同深度传感器应变测试值随工作面的变化规律,确定出煤层底板岩体破坏深度介于18～20 m;以研究区实际地层资料为基础建立工程地质模型,通过反复试算、逐步修正模型边界条件,对煤层底板破坏特征进行分析,弥补了现场实测结果不能反映出煤层回采过程中底板应力场的不足;采用现场应变实测和数值模拟相互结合的方法,确定了大采深厚煤层底板破坏深度为20 m,揭示了矿山压力在采动煤层底板中的传播规律。
Aimed at the trend of water inrush disasters increasing annually with the mining depth above confined aqui- fers, based on the conditions of the fully mechanized workface in the deep mine, and according to the in-situ strain val- ue of the mining face at different depth under the coal seam bed, it was determined the coal seam floor failure depth was between 18-20 m. This study analyzed the characteristics of coal seam floor failure through repeated calculations and gradual correction to model boundary conditions, based on the actual formation material in the study area to estab- lish the geological model, which makes up for the disadvantages of coal seam mining stress that the field measurement result could not reflect. The coal seam floor failure depth was 20 m, and it revealed the characteristics of the mine pressure in mining coal floor when combining the in-situ strain measurement method with the numerical simulation method.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2013年第1期67-72,共6页
Journal of China Coal Society
基金
国家自然科学基金资助项目(41102201)
江苏省普通高校研究生科研创新计划资助项目(CXZZ12-0948)
关键词
底板突水
带压开采
破坏深度
现场应变法
数值模拟
water inrush from floor
mining pressure
damage depth
in-situstrain test
numerical simulation
