摘要
为解决中西部地区沟谷地貌条件下厚煤层综采强矿压灾害问题,采用理论分析和数值模拟方法,研究沟谷地貌条件下开采覆岩结构特征和时空演化规律,建立沟谷地貌条件下回采工作面支架承载力学模型,得到支架载荷并进行支架合理选型,提出了协同控制措施。研究结果表明:工作面进、出沟谷过程中,破断块体临空侧在上坡段缺少水平应力,无法形成稳定铰接结构,极易发生滑落失稳和整体下沉,失稳后全部载荷作用于工作面支架,是强矿压事故发生的根本原因。提出支架工作阻力和支架架型优选,以及对动载易发区域超前预警、加强临时支护的协同控制措施,现场实测发现ZY12000/28/64D型液压支架工作状态良好,能够较好地适应沟谷地貌条件下煤炭的安全生产要求。
In order to solve the problem of strong ground pressure in fully mechanized thick coal seam under the condition of gully landform in central and western China,theoretical analysis and numerical simulation were used to study the structural characteristics and space-time evolution law of mining overburden strata in gully landform,the mechanical model of the hydraulic support in mining face under the condition of gully landform was established.The support load was obtained and the reasonable selection of the support was carried out,collaborative control measures were proposed.The results show that during the process of entering and exiting the gully in the working face,the broken blocks miss the horizontal stress in the uphill gully and cannot form the hinge structure,which is prone to slip instability and overall subsidence,all the load acting on the working face after the falling off instability is the root cause of the strong ground pressure accident.This paper puts forward the collaborative control measures including working resistance of the support,the optimization of hydraulic support,early warning of the areas prone to dynamic load and the strengthening of temporary support.The field test shows that the ZY12000/28/64D hydraulic support is in good working condition and can well meet the safety production requirements of mining under the gully terrain.
作者
郭靖
GUO Jing(Department of Mining Engineering,Luliang University,Luliang 033000,China)
出处
《矿业安全与环保》
北大核心
2020年第1期75-79,共5页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(51704204)
关键词
沟谷地貌
强矿压显现机理
综采工作面
顶板结构演化
协同控制措施
gully terrain
strong ground pressure developing mechanism
fully mechanized working face
roof structure evolution
collaborative control measure
