| 综放工作面厚硬顶板破断特征与支架工作阻力确定 |
| |
| 作者姓名： | 程占博 孔德中 杨敬虎 |
| |
| 作者单位： | 1.中国矿业大学(北京) 资源与安全工程学院,北京100083;2.放顶煤开采煤炭行业工程研究中心,北京100083;3.贵州大学矿业学院,贵州贵阳550003 |
| |
| 基金项目： | 国家重点基础研究发展计划（973计划）（2013CB227903）国家自然科学基金（U1361209、51574244） |
| |
| 摘 要： | 针对综放工作面厚硬顶板初次来压步距难以确定的问题，以东周窑煤矿8301工作面为工程背景，建立厚硬基本顶的固支梁模型，运用能量法求得分布于基本顶中的水平应力，进而得到基本顶初次来压步距解析式，采用数值模拟对顶板破断特征和工作面支架工作阻力进行分析，并对不同推进距离下工作面不同位置支架工作阻力进行了现场监测。研究结果表明:相比一般综放工作面，坚硬顶板条件下工作面初次来压步距和支架工作阻力明显增加，顶板破断后对工作面形成冲击较大，矿压显现剧烈；8301工作面初次来压步距为58 m，周期来压步距为15~20 m，动载系数为1.5~1.8；基于能量法求得支架额定工作阻力为13 000 kN，而来压期间支架工作阻力为11 000 kN，是额定工作面阻力的84.6%，能够满足厚硬顶板条件下煤矿安全高效开采的要求。
|
| 关 键 词： | 综放开采 厚硬顶板 能量法 来压步距 支架工作阻力 |
| 收稿时间： | 2016-05-26 |
The breaking characteristics of thick The breaking characteristics of thick hard roof and determination of support capacity in fully mechanized caving facehard roof and determination of support capacity in fully mechanized caving face |
| |
| Affiliation: | 1.College of Resources and Safety Engineering,China University of Mining and Technology,Beijing 100083,China;2Coal Industry Engineering Research Center of Top coal Caving Mining, Beijing 100083,China;3Mining School, Guizhou University, Guiyang,Guizhou 550003, China |
| |
| Abstract: | It is difficult to determine the first roof weighting interval of hard roof on fully mechanized caving face. Based on the working face 8301 of Dongzhouyao coal mine, a model of two edges fixed in thick and hard roof was established by using energy method. According to the model, the horizontal stress distribution in the main roof and the analytic formula for the first roof weighting interval of the main roof were obtained. The characteristics of roof breaking and working resistance of the support were analyzed by using numerical simulation. And the working resistance of support in different positions of the working face under different advance distance was attained based on field observation. The results showed that mine pressure behaviors were more intense under the condition of thick and hard roof, with larger the first roof weighting interval and higher working resistance of support as compared to general conditions. To be specific, the first roof weighting interval was about 58 m in working face 8301, while the periodic roof weighting length ranged from 15 to 20 m. The rated working resistance of support was 13,000 kN, but the observed maximum working resistance was 11 000 kN, only 78.7% of the rated value. It is believed that safety and efficiency of coal mining under the condition of thick and hard roof can be achieved. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《》浏览原始摘要信息 |
|
点击此处可从《》下载全文 |
|
