煤层围岩破裂过程中的自然电位响应  

Natural potential response during the coal rock failure process

作　　者：吴超凡[1,2] 刘盛东[2,3] 杨胜伦[4] 路拓[3] 王勃[3] 

机构地区：[1]龙岩学院资源工程系,福建龙岩364012 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [3]中国矿业大学资源与地球科学学院,江苏徐州221008 [4]安徽惠洲地下灾害研究设计院,安徽合肥230088

出　　处：《煤炭学报》2013年第1期50-54,共5页Journal of China Coal Society

基　　金：国家"十二五"科技支撑计划课题资助项目(2011BAK07B02);国家自然科学基金资助项目(51004102);福建省自然科学基金资助项目(2010J01262)

摘　　要：煤层开采过程中,围岩破裂伴有电子逃逸现象,引起自然电场的变化。通过建立数值模型与设计岩层开采模拟实验,发现岩层裂隙发育部位自然电位降低,且裂隙发育越完全电位越低;岩层压缩区自然电位升高。煤矿开采过程实际监测发现:在煤层顶板"三带"中,垮落带自然电位低,且变化比较稳定;断裂带自然电位表现较为不稳定,变化频繁;弯曲下沉带表现为高电位,且极为稳定,变化较小。In wall rock failure process ,the electronic escape phenomenon normally occurs, which causes the change of the natural electric field in the coal rock. Through the establishment of a numerical model and design of a rock mining simulation experiment, the authors found the natural electrical potential of rock at crack development site is reduced, and it is much lower with a full fracture development,while the natural electrical potential increases at rock compres- sion area. The findings in the monitoring in coal mine mining demonstrate that in the three zones of seam roof, the nat- ural electrical potential is low and stable at caving zone;more unstable and frequent alternation at crack development zone;high, stable and less changes at bending sink zone. Natural electrical potential alternation plays a guiding role and has practical significance for determining the fracture development level and scope of fracture zones at coal seam floor and roof.

关 键 词：围岩破裂 自然电位 电法勘探 

分 类 号：P631.3[天文地球—地质矿产勘探]