周海丰 黄庆享 贺雁鹏

摘 要：為了掌握神东矿区浅埋煤层8.8 m大采高综采工作面矿压规律和上覆岩层运动规律，指导液压支架选型和顶板管控，以上湾煤矿12402综采工作面为研究对象，采用数值模拟、现场实测和数据分析的方法，总结了8.8 m大采高综采工作面初采期间地表塌陷规律、基本顶初次来压，以及周期来压步距和来压强度规律，分析了周期来压规律与采高、埋深、基岩厚度等因素的关系，对回采期间支架工作阻力频率进行分析;利用正态分布理论对支架选型和适应性进行了评价。研究表明：神东矿区浅埋煤层8.8 m大采高综采工作面上覆岩层呈现“O-X”破断规律，初次来压步距为60 m，周期来压步距17～20.6 m，基本顶初次来压和周期来压步距与采高关系不大，周期来压持续距离、来压范围和来压期间的平均工作阻力随着基岩厚度和埋深的增大而增大，与基岩厚度和埋深成正比，液压支架工作阻力频率符合正态分布，满足使用要求。

关键词：大采高;浅埋煤层;支架选型;正态分布

中图分类号：TD 324

文献标志码：A

文章编号：1672-9315（2020）06-0981-07

DOI：10.13800/j.cnki.xakjdxxb.2020.0607开放科学（资源服务）标识码（OSID）：

Law of ground pressure in 8.8 m large mining

height fully on mechanized face

ZHOU Hai-feng1，2，HUANG Qing-xiang1，HE Yan-peng1

（1.College of Energy Science and Engineering，Xian University of Science and Technology，Xian 710054，China;

2.Shenhua Shendong Coal Group Co.，Ltd.，Shenmu 719315，China）

Abstract：In order to understand the law of ground pressure and the law of overlying strata movement in a fully mechanized mining face with large mining height of 8.8 m in shallow seam in Shendong mining area，and guide the selection of hydraulic support and roof control.The 12402 fully mechanized working face of Shangwan Coal Mine was taken as the research object.Using the methods of numerical simulation，field measurement and data analysis，the law of surface subsidence during the initial mining of the 8.8 m large mining height fully mechanized mining face，the law of first weighting and periodic weighting interval and the strength of the weighting are summarized of the main roof.The relationship between the law of periodic weighting and mining height，depth，the thickness of bedrock and other factors are analyzed，and we analyze the working resistance frequency of hydraulic support during mining，and use the theory of normal distribution to evaluate the support selection and adaptability.The results show：the overburden strata of 8.8 m large mining height fully mechanized working face in Shendong mining area presents “O-X” breaking law，the first weighting interval is 60 m，the periodic weighting interval is 17～20.6 m，the main roof first weighting and periodic weighting interval spacing have little relationship with mining height.The continuous distance of periodic weighting，weighting range and average working resistance during weighting increase with the increase of bedrock thickness and buried depth.The working resistance frequency of hydraulic support conforms to the normal distribution and meets the use requirements.

Key words：large mining height;shallow coal seam;support selection;normal distribution

0 引 言

神东基地作为国家14个大型煤炭基地之一，位于晋陕蒙3省交界地带，煤储量达到3 585.4亿吨，以中厚-厚煤层为主，其中厚煤层所占比例达到51%.矿区煤层厚度8.0 m以上煤层地质储量约20亿吨，主要分布在上湾、补连塔、西湾、大保当等煤矿。特厚煤层采用综采一次采全高，相比分层开采和综放工艺具有回采效率高、工艺简单等优势。……