| 浅埋煤层关键隔水层隔水性能及采动影响变化 |
| |
| 引用本文： | 蒋泽泉,王建文,王宏科.浅埋煤层关键隔水层隔水性能及采动影响变化[J].中国煤炭地质,2011(4):26-31. |
| |
| 作者姓名： | 蒋泽泉 王建文 王宏科 |
| |
| 作者单位： | [1]陕西省煤田地质局一八五队,陕西榆林719000 [2]神木柠条塔矿业有限公司,陕西神木719315 |
| |
| 基金项目： | 陕西省科学技术计划（2008KR58）; 陕西神南矿业公司2008-2010年科学技术计划 |
| |
| 摘 要： | 陕北浅埋煤层开采引起了一系列的生态环境问题,保水采煤成为陕北乃至整个西北地区煤炭资源科学开采的关键。以神南矿区为例,研究了黄土、红土隔水层的隔水性及采煤对其隔水性的影响。神南矿区砂土基型煤层的保水开采的关键隔水层为上覆粘土层,室内、外试验显示：粘土层失稳后流量猛增形成裂隙流,不利于保水采煤;黄土受地面张裂隙发育的剪切作用处于破碎状态,采动后渗透系数表现为数个数量级的变化;红土处于整体下沉带,受附加应力影响表现出较大的塑性变形,采动后渗透性减小,有利于保水采煤。为实现保水采煤,保证粘土层整体不失稳,宜采用回填采空区技术对地面沉降以及土体围压进行控制,当地面沉降量减小时黄土层可保持不失稳,当侧限应力存在时粘土层的稳定性亦可以保持。
|
| 关 键 词： | 隔水岩组 压水试验 保水采煤 渗透系数 神南矿区 |
Impermeability and Mining Impacts of Key Aquifuges for Shallowly Buried Coal Seams |
| |
| Jiang Zequan,Wang Jianwen and Wang Hongke.Impermeability and Mining Impacts of Key Aquifuges for Shallowly Buried Coal Seams[J].Coal Geology of China,2011(4):26-31. |
| |
| Authors: | Jiang Zequan Wang Jianwen and Wang Hongke |
| |
| Institution: | 1.No.185 Exploration Team,Shaanxi Bureau of Coal Geological Exploration,Yulin,Shaanxi 719000; 2.Shenmu Ningtiaota Mining Industry Co.Ltd.,Shenmu,Shaanxi 719315) |
| |
| Abstract: | The mining of shallowly buried coal seams has brought a series of ecological environmental problems;water conservation coal mining is the key issue in coal resource scientific mining in the northern Shaanxi and even whole Northwest China.Taking the Shennan mining area as an example,the paper studied impermeabilities of loess and red loam aquifuges and mining impacts on them.Coal seams in water conservation mining are covered with clay and sands;the overlying clay is the crucial aquifuge.Laboratory and field tests have demonstrated that： after the overlying clay is disturbed,water inflow will soar to rise rapidly and form fissure flow,that is went against to water conservation coal mining.When loess is subjected to the ground surface tension fissure developed shearing will be in broken state,permeability coefficient variation will appear as some orders of magnitude after mining;while the red loam is stand in the integral settlement zone,subjected to additional stress and is indicative of greater plastic deformation,permeability is reduced after mining,thus in favor of water conservation coal mining.To realize water conservation coal mining and keep clay bed undisturbed integrally,gob area stowing is advised to control surface subsidence and soil mass confining pressure.When surface subsidence is reduced,loess bed can keep undisturbed,and confining stress is existed,clay bed stability can also be kept. |
| |
| Keywords: | impermeable measures packer permeability test water conservation coal mining permeability coefficient Shennan mining area |
| 本文献已被 维普 等数据库收录！ |
|
