摘要
针对黄河北煤田赵官煤矿大水高瓦斯厚冲积层薄基岩复杂开采条件,本文通过理论分析、数值模拟方法对赵官煤矿综采工作面采场上覆岩层纵向分带发育规律和其结构形态进行了研究,得到了采场上覆岩层纵向运动破坏规律及其结构形态,即在采动应力作用下,采场上覆岩层开始呈现较平的“枕型”结构形态,随着采场支承压力不断增加,采动破坏岩层逐渐演化为“拱型”结构形态,当工作面推采距离达到工作面长度时,采场上覆破坏岩层在工作面纵向上扩展到最高处,此后随着工作面的不断推进,断裂拱高保持不变,而拱脚不断向前方扩展,呈现出“平顶拱型”结构形态;同时通过理论计算和现场实测对比分析,得到了采场上覆岩层冒落带、裂隙带分布范围,即冒落带高度为2.4 m,裂隙带为19.1 m,裂采比为15.3,为矿井采场顶板控制、支架选型和瓦斯抽采参数确定提供了科学依据,对实现薄煤层综采安全高产高效的具有意义。
Based on the complex mining conditions of thick alluvial bed and thin bedrock with high water and high gas in Zhaoguan mine of Huanghebei coal field,the vertical zonation development law and its structure form of overlying strata in fully mechanized mining face of Zhaoguan coal mine are studied by the ways of theoretical analysis and numerical simulation,the failure rules and structural forms of overlying strata in stope are obtained.That is,under the action of mining stress,the overlying strata in the stope begins to show relatively flat“pillow”shape at the beginning;with the increase of stope abutment pressure,mining-induced failure strata is gradually evolved into an“arch”structure;when the pushing distance of the working face reaches the length of the working face,the overlying failure strata extends to the highest height lengthwise.Since then,as the working face continues to advances,the fracture arch height remains the same,while the arch foot continues to extend forward,and the“flat-top arch”structure is showed.At the same time,theoretical calculation and field measurement are compared and analyzed to obtain the distribution range of overlying strata caving zone and fracture zone.That is,the height of the caving zone is 2.4 m,and the fracture zone is 19.1 m,The ratio between the height of the fracture zone and the height of mining is 15.3.Thus scientific basis is provided for roof control,support selection and gas extraction parameters determination,which is significant in realizing the safety,high yield and high efficiency in fully mechanized mining of thin coal seam.
作者
高明涛
辛恒奇
郭忠平
莫技
庞继禄
GAO Ming-tao;XIN Heng-qi;GUO Zhong-ping;MO Ji;PANG Ji-lu(School of Mining and Safety Engineering,Shandong University of Science and Technology Qingdao 266590,China;Xinwen Mining Group Limited Liability Company,Taian 271200,China;National Engineering Lab of Backfill Mining in Coal Mine,Taian 271200,China)
出处
《西安科技大学学报》
CAS
北大核心
2019年第5期790-801,共12页
Journal of Xi’an University of Science and Technology
基金
国家重点研发计划“深地资源勘查开采”重点专项项目“深部煤矿井下智能化分选及就地充填关键技术装备研究与示范”(2018YFC0604700)
国家自然基金面上基金(51474134)
矿山灾害预防控制国家重点实验室开放基金资助项目(MDPC2013KF19)
关键词
采场结构
薄煤层
岩层运动
采动裂隙带
上覆岩层
stope structure
thin seam
stratum movement
mining fissure zone
overburden rock
