| 孤岛工作面底板破坏深度微震测试与模拟分析 |
| |
| 引用本文： | 赵春虎.孤岛工作面底板破坏深度微震测试与模拟分析[J].煤田地质与勘探,2019,47(4):110-116. |
| |
| 作者姓名： | 赵春虎 |
| |
| 作者单位： | 中煤科工集团西安研究院有限公司;陕西省煤矿水害防治技术重点实验室 |
| |
| 基金项目： | 国家重点研发计划项目（2017YFC0804103）；天地科技股份有限公司科技创新基金项目（2018-TD-MS069）；煤炭开采水资源保护与利用国家重点实验室开放基金（SHJT-16-30.9）；中煤科工集团西安研究院有限公司创新基金项目（2018XAYZD13-1，2017MS007） |
| |
| 摘 要： | 针对孤岛工作面煤层开采底板损伤问题，以河北葛泉煤矿11913孤岛工作面为研究对象，采用微震方法分析其底板破坏深度；并通过数值模拟对首采、跳采及孤岛3种工作面回采过程中围岩采动应力与底板破坏的规律进行了对比分析。微震测试结果显示11913工作面回采过程中微震事件主要发生在下巷，识别出工作面最大破坏深度20~25 m；基于COMSOL的11912首采、11914跳采及11913孤岛3个工作面数值模拟结果显示，11912首采与11914跳采条件下煤柱地应力集中状态变化不大，最大破坏深度小于11.56 m，仅发育至工作面底板的注浆改造层内部；而11913孤岛回采条件下，受到重复采动影响，工作面两侧煤柱应力集中状态骤增，最大破坏深度剧增至23 m，已发育至煤层底板的本溪组灰岩含水层。研究结果对于华北型煤田下组煤层开采底板破坏规律分析与不同类型工作面回采条件下底板水害防治有一定的参考价值。
|
| 关 键 词： | 孤岛工作面 破坏深度 重复采动 微震 数值模拟 葛泉煤矿 河北邢台 |
| 收稿时间： | 2019-02-22 |
Microseismic test and numerical simulation analysis of floor failure depth of isolated coal mining face |
| |
| Abstract: | Aiming at the damage of coal seam floor caused by mining in isolated coal mining face, taking 11913 isolated coal mining face in Gequan coal mine of Hebei Province as the research object, and using KJ959 coal mine microseismic monitoring system to detect the floor failure depth. It is recognized that the microseismic events mainly occur in the roadway of the isolated coal mining face during the mining process, and the maximum vertical failure depth is about 20~25m; Moreover, using the COMSOL multi-physical field numerical simulation platform, the variation of in-situ stress and failure law of coal seam floor under the conditions of 11912 first coal mining face, 11914 jumping coal mining face and 11913 isolated coal mining face are analyzed. The simulation results show that the in-situ stress concentration state of coal pillars under the conditions of 11912 first mining face or 11914 jumping mining face has little change, and the maximum failure depth is less than 11.56 m, which only develops into the interior of grouting reformation layer. Under the condition of 11913 isolated mining face, the in-situ stress concentration state of coal pillars on both sides of mining face increases sharply due to the influence of repeated mining in mining faces 11912 and 11914, and the maximum failure depth increases to 23 m, which has extended to Benxi limestone aquifer of coal seam floor. The conclusion has certain reference value for the study of floor failure law of North China type coalfield and the selection of grouting transformation horizon under different mining conditions. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《煤田地质与勘探》浏览原始摘要信息 |
| 点击此处可从《煤田地质与勘探》下载免费的PDF全文 |
