综放开采散体顶煤初始煤岩分界面特征及控制方法  

Characteristic and Control Method of Initial Interface Between Coal and Rock Under Fully Mechanized Loose Top Coal Caving

作　　者：王家臣[1] 宋正阳[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤炭工程》2015年第7期1-4,共4页Coal Engineering

基　　金：国家自然科学基金煤炭联合基金项目(U1361209);国家重点基础研究发展计划(973计划)资助项目(2013CB227903)

摘　　要：综放开采中,初始煤岩分界面作为后续移架放煤过程的约束边界,其发育过程和形态特征对后续放煤效果影响很大。以散体介质流思想为基础,结合室内散体顶煤放出三维模拟试验和PFC3D数值模拟结果,建立散体顶煤初始煤岩分界面的力学模型并进行深入分析。结果表明,初始煤岩分界面斜率上小下大的根本原因是煤岩分界面上不同位置所受侧向压力不同,放煤步距和破碎成散体的直接顶厚度是控制初始煤岩分界面形态的重要因素。提出了破碎直接顶合理厚度的确定方法和计算公式,从而达到控制散体顶煤初始煤岩分界面形态使其利于后续移架放煤的目的。As the constrained boundary of drawing process after initial top coal drawing, the development process and morphological characteristic of initial interface between coal and rock is vital to subsequent drawing process under long wall top coal caving technique. Based on the loose medium flow field theory, mechanical model of initial interface between loose coal and rock was buih combining with the result of 3D loose top coal drawing experiment and PFC3D numerical simulation. The result shows that the basic reason for the specific morphology of initial interface between coal and rock is that different positions on the initial interface between coal and rock undertake different lateral pressures. The drawing interval and the height of broken immediate roof are important factors to control the morphology of initial interface between coal and rock. The paper proposed the method to determine proper height of broken immediate roof in order to make the morphology of initial interface between coal and rock favorable to subsequent drawing process.

关 键 词：散体顶煤 初始煤岩分界面 放煤步距 放煤漏斗 破碎直接顶厚度 

分 类 号：TD823.49[矿业工程—煤矿开采]