深埋薄基岩顶板来压与底板破坏深度关系  

Relationship between deep depth and thin base rock roof pressurized and floor failure depth

作　　者：李春元[1] 张勇[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京10083

出　　处：《煤炭科学技术》2016年第8期74-79,共6页Coal Science and Technology

基　　金：中央高校基本科研业务费专项资金资助项目(2011YZ05);国家重点研发技术资助项目(2016YFC0600708)

摘　　要：为解决现场顶板频繁剧烈来压造成的底板突水问题,根据实测深埋薄基岩采场矿压显现特征及关键层垮断失稳判别方法,分析了顶板来压时冲击载荷的作用机理,应用弹性理论及摩尔-库仑准则推导了顶板冲击载荷和支承压力叠加作用下的采场底板破坏深度计算公式,研究得出了顶板来压与底板破坏深度的关系,提出了相应的底板破坏深度控制技术,现场应用生产效率提高约91.7%。结果表明:顶板来压步距越大,冲击载荷越大;顶板冲击载荷及支承压力的叠加作用导致底板破坏深度增加;随来压步距增大,底板破坏深度先增加后又趋于稳定;顶板剧烈来压的周期性造成了底板破坏和底板出水的周期性。In order to solve the floor water inrush problem caused by the frequent and serious site roof pressurized,according to the measured mine pressure behavior features of the coal mining face with the deep depth and thin base rock,the collapsing and instability distinguishing method of the key layer was applied to analyze the bumping load role mechanism when the roof was pressurized. The elastic theory and Mohr-Coulomb criterion were applied to derive the calculation formula of the floor failure depth in the coal mining face under the roof bumping load and support pressure superposition role and to study the relationship between the roof pressurized and floor failure depth. The related control technology of the floor failure depth was provided and the production efficiency was improved by 91.7%. The results showed the longer step distance of the proof pressurized,the higher bumping load would be. The superposition role of the roof bumping load and support pressure would cause the floor failure depth increased. With the step distance of the roof pressurized increased,the floor failure depth would be increased firstly and then would be in stable. The periodicity of the roof serious pressurized would cause the periodicity of the floor failure and floor water inflow.

关 键 词：底板破坏深度 顶板来压 薄基岩 来压步距 冲击载荷 

分 类 号：TD323[矿业工程—矿井建设]