超大采高综采面煤壁灾变的“尺度效应”与采高上限确定研究

项目名称： 超大采高综采面煤壁灾变的“尺度效应”与采高上限确定研究

项目编号： No.51304115

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 范志忠

作者单位： 煤炭科学研究总院

项目金额： 25万元

中文摘要： 我国实践的超大采高综采液压支架最大支撑高度已达7.2m，据调研，超大采高工作面普遍存在煤壁灾变等一系列围岩控制难题。本课题目的旨在从控制煤壁失稳乃至灾变角度研究我国超大采高综采合理的割煤高度上限，拟选取国内现有的4-6个不同赋存条件的超大采高工作面为研究对象，研究由于长度、倾角、采高、埋深、煤岩物理力学性质等因素变化所产生的各种微尺度效应。采用煤岩应力层析成像系统研究超大采高工作面工作面超前支撑压力形态及其对煤壁损伤的影响程度；采用钻孔电视实测煤壁前方不同层位煤体采动裂隙场时空演化规律及其对煤壁片帮乃至灾变的影响；采用便携式微震监测系统及其定位功能，研究不同采高条件下煤壁失稳发生的位置、频率和释放能量大小，探寻工作面灾变能量释放强度同采高之间的量化关系；建立超大采高工作面老顶失稳模型，研究超大采高工作面支架支护及护帮强度的确定方法，得出超大采高综采煤壁灾变的尺度效应规律和采高上限确定理论。

中文关键词： 大采高综采；煤壁灾变；尺度效应；采高上限；

英文摘要： The maximum support height of the full-mechanized hydraulic support in large mining height working faces applied in China has reached 7.2m. According to the survey, the problems of surrounding rock control such as coal-wall catastrophe etc, are ubiquity in super-high cut faces.This subject is aimed at selecting 4-6 domestic super-high cut working faces of different storage condition to study the microscale effects produced by length, angle, height, depth, coal physical and mechanical properties and other factors, which also studys the reasonable upper mining limit from the view of controlling coal wall instability and catastrophe. By using of the coal rock chromatography imaging system,the advanced support pressure morphology and effect on the coal wall damage in the large mining height working face are researched . And the crack field spatio-temporal evolution and its impact on the coal wall spalling and disaster in different layers of coal body in front of the coal wall mining are also measured by using of the borehole television.The research will analyze the distribution, frequency and energy release intensity of coal wall instability to search the quantitative relationship between the face catastrophic energy release intensity and the mining height by using of the portable microseismic monitoring system and

英文关键词： Large mining height fully mechanized mining；Coal wall collapse；Scale effect；Mining height limit；