采矿与安全工程学报2017，Vol.34Issue(5)：861-867,7.DOI:10.13545/j.cnki.jmse.2017.05.006
大采高工作面冒落带动态分布特征及确定方法
Dynamic distribution characteristics and determination method of caving zone in overburden strata with large mining height
摘要
Abstract
According to the characteristics of large volume of goaf and ground pressure activity with large mining height, the immediate roof is divided into two types, which are having structure strata and no structure strata. Dynamic distribution equation of two kinds of caving zone in the different mining stage is established with considering functions of self-gravity compression of caving gangue and apply-ing loading of instability of structural strata to the caving zone, which reveals the dynamic distribution characteristics of goaf in caving zone. The results show that the caving zone presents obviously dynamic distribution characteristic in goaf with a large mining height. The changing height of caving zone is re-lated to the thickness and bulk density of the rock strata structure, mining time of workface, initial hulking coefficient and compression modulus of caving gangue; The caving zone sharply increases be-fore masonry beam structure breaking the main roof in a short period of time and reaches the maximum value. In this stage, the caving gangue self-compression increases the goaf height to further increase caving zone height; The caving coal gangue compression by the rotary load of main roof masonry beam structure and the dynamic loading of sliding instability of the immediate roof structure strata is influ-enced by strata thickness and bulk density and sustainable time; The height of caving zone slowly drops with the mining time lapsing and tends to be stable after a certain time point.关键词
大采高工作面/冒落带/动态分布/覆岩结构Key words
workface with large mining height/caving zone/dynamic distribution/structure of overburden strata分类
矿业与冶金引用本文复制引用
向鹏,孙利辉,纪洪广,高宇,刘阳军,武亚峰..大采高工作面冒落带动态分布特征及确定方法[J].采矿与安全工程学报,2017,34(5):861-867,7.基金项目
国家重点研发计划(2016YFC0600801) （2016YFC0600801）
国家自然科学基金重点资助项目(51534002) （51534002）
