综放开采散体顶煤初始煤岩分界面特征及控制方法

doi:10.11799/ce201507001

煤炭工程 ›› 2015, Vol. 47 ›› Issue (7): 1-4.doi: 10.11799/ce201507001

• 设计技术 • 下一篇

综放开采散体顶煤初始煤岩分界面特征及控制方法

王家臣

中国矿业大学(北京) 资源与安全工程学院

收稿日期:2015-01-26 修回日期:2015-03-31 出版日期:2015-07-10 发布日期:2015-07-15
通讯作者: 王家臣 E-mail:villasoon@hotmail.com

Characteristic and control method of initial interface between coal and rock under longwall top coal caving technique

Received:2015-01-26 Revised:2015-03-31 Online:2015-07-10 Published:2015-07-15

摘要/Abstract

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PFC^3D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。

关键词: 关键词：初始煤岩分界面, 放煤步距, 综放开采, 放煤漏斗, 破碎直接顶厚度

Abstract: Abstract: 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 longwall top coal caving technique. Based on granular mechanics, mechanical model of initial interface between coal and rock was built combined with the result of 3-D loose top coal drawing experiment and PFC3D numerical simulation. The result after deep analysis shows that the basic reason for the specific morphology of initial interface between coal and rock (the slope of initial interface between coal and rock decreases with the increment of height ) is that different positions on the initial interface between coal and rock undertake different lateral pressure. The drawing interval and the height of broken immediate roof are the important factors to control the morphology of initial interface between coal and rock. This paper expounds the relation between the drawing interval and the size of initial funnel of drawing coal. The paper also proposesd the method to determine proper height of broken immediate roof in order to make the morphology of initial interface between coal and rock be favorable to subsequent drawing process.

Key words: Key words: initial interface between coal and rock, drawing interval, longwall top coal caving, funnel of drawing coal, height of broken immediate roof

中图分类号:

TD823.4+9

王家臣，宋正阳. 综放开采散体顶煤初始煤岩分界面特征及控制方法[J]. 煤炭工程, 2015, 47(7): 1-4.

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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 longwall top coal caving technique

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