摘要
以新疆伊犁四矿21103综放工作面采矿地质条件为工程背景,针对伊犁矿区弱胶结地层条件开展了采动覆岩活动规律氡气探测三维物理模拟试验。结果表明:伊犁矿区弱胶结地层中覆岩无明显的关键层结构,覆岩采动裂隙随工作面推进同步向上发育;21103综放工作面初次来压步距约40 m,周期来压步距约20 m;采动覆岩垮落带高度为31.7 m,裂隙带高度为29.8 m,弯曲下沉带高度为53.5 m。试验过程中氡气浓度最大值约5300 Bq/m3,表明弱胶结地层内部原生裂隙较为发育,可以给氡气运移提供较好的优势通道,采动覆岩"裂隙发育-基本顶破断-裂隙闭合"过程与氡气浓度"增大-峰值-减少"过程二者之间具有明显的对应关系。
With the fully-mechanized caving coalface 21103 of Yili No. 4 coal mine in Xinjiang as engineering background, three-dimensional physical simulation test for activity laws of mining-induced overburden by radon detection has been carried out under the condition of weakly consolidated formations in Yili mining area. The test results have shown that there is no obvious key stratum structure in the weakly consolidated formations of Yili mining area, with the mining-induced fractures in overburden developing synchronously upward with the advancement of coalface. Moreover, the first and the periodic weighting intervals of the fully-mechanized caving coalface 21103 are about 40 m and 20 m, respectively. The height of caving zone in mining-induced overburden is 31.7 m, the fracture zone 29.8 m, and the bending subsidence zone 53.5 m. The maximum radon concentration is about 5300 Bq/m3 in the test process. Therefore, it can be concluded that primary fractures is relatively developed in weakly consolidated formations, which can provide better preferential channels for radon migration. Furthermore, there is an obvious correspondence between the process of "fracture development-main roof breakage-fracture closure" in mining-induced overburden and the process of "increase-peakdecrease" in radon concentration.
作者
张炜
孙毓言
张东升
张磊
唐佳佳
范钢伟
梁帅帅
ZHANG Wei;SUNYuyan;ZHANG Dongsheng;ZHANG Lei;TANG Jiajia;FAN Gangwei;LIANG Shuaishuai(State Key Laboratory of Coal Resources and Safe Mining,School of Mines,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第6期1102-1108,共7页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2015CB251600)
国家自然科学基金项目(51874278,51774268)
江苏省自然科学基金项目(BK20181357)
江苏省“六大人才高峰”高层次人才项目(JNHB-087)
江苏省科协青年科技人才托举工程项目(苏科协发〔2019〕134号)
中央高校基本科研业务费专项资金项目(2017XKQY022)
关键词
伊犁矿区
弱胶结地层
采动覆岩
活动规律
氡气探测
三维物理模拟试验
Yili mining area
weakly consolidated formations
mining-induced overburden
activity laws
radon detection
three-dimensional physical simulation test
