矿井通风对光卤石围岩潮解影响的实验研究  

Laboratory Experiment Research on the Effect of Mine Ventilation on Carnallite Surrounding Rock Deliquescence

作　　者：杜晓丽[1,2,3] 魏京胜[3] 宋宏伟[3] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学矿业工程博士后流动站,安徽淮南232001 [3]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《地下空间与工程学报》2016年第6期1565-1569,共5页Chinese Journal of Underground Space and Engineering

基　　金：湖南科技大学煤矿安全开采技术湖南省重点实验室开放基金(201202);中国博士后科学基金(2013M541811);国家自然科学基金(41301074);安徽理工大学博士基金

摘　　要：光卤石围岩潮解改变了巷道的断面形状、降低了围岩强度,导致金属类支护结构腐蚀甚至失效,给井巷围岩稳定带来安全隐患。为抑制可溶性钾盐井巷潮解,利用双模理论和室内实验分析了光卤石围岩潮解机理及影响因素,探讨了矿井通风相对湿度、风速对光卤石围岩潮解的影响,得到以下主要结论：通风湿空气水蒸气分压力与湿巷壁潮解盐液表面水蒸气压力差是围岩潮解的驱动力;通风湿空气相对湿度和风速是光卤石围岩潮解的重要影响因素;当通风干球温度控制在21℃~23℃时,光卤石潮解的临界湿度介于53%~67%之间;将通风相对湿度控制在53%以下、在满足生产需要的前提下减小通风风速,有利于抑制光卤石围岩的潮解破坏。Deliquescence of surrounding rock which comprising carnallite changes the cross-section shape of roadway,reduces the strength of surrounding rock and rusts metal supporting structure,resulting in security risks to the stability of surrounding rock on roadway. In order to inhibit the deliquescence on soluble potash,the mechanism and influence factors of surrounding rock which comprising carnallite are analyzed using the dual mode theory and indoor experiments. Besides,the effect of relative humidity and wind speed of mine ventilation on deliquescence are also discussed by laboratory experiment. Based on the experiments and theoretical analysis,the following important results are obtained： The pressure difference on water vapor pressure of mine ventilation and deliquescent salt solution surface in wetting wall is the driving force for deliquescence on surrounding rock; The wind velocity and relative humidity of mine ventilation are important influencing factors of deliquescence on surrounding rocks; When the air dry bulb temperature of mine ventilation is controlled at 21 ℃ ~ 23 ℃,the critical humidity of deliquescence on carnallite range is between 53% and 67%; The air relative humidity is controlled below 53% and the ventilation velocity is reduced without decreasing the production needs will be taken to inhibit the deliquescence failure on surrounding rock which are composed of carnallite.

关 键 词：采矿工程 矿井通风 井巷 光卤石 潮解 

分 类 号：TU457[建筑科学—岩土工程]