回采巷道底鼓机理分析

介绍了回采巷道底板岩层结构特征,就采动对底鼓的影响和现场观测实例进行了分析。

1021巷道底板围岩稳定性数值模拟分析及工程验证

以回坡底煤矿1021巷道底鼓现象为研究背景,通过数值模拟,研究了1021巷道底板围岩的水平变形量、垂直变形量,并实施了相应的底鼓防治技术。现场监测结果表明,与未经过底鼓防治处理的巷道相比,防治段巷道底板变形量大幅减小,验证了底鼓防治技术是可行的。

大断面煤巷联合支护在井工二矿的应用

安家岭井工二矿9#煤掘进巷道属于大断面巷道,沿顶底板掘进,巷道跨距大,支护困难,利用高强度、高预紧力锚杆和锚索支护理论提出了巷道的支护理论并在现场应用,取得了理想的支护效果。

华苑公司10~#煤10203巷道支护研究与应用

华苑公司10#煤层厚度稳定,煤层厚度3.45~4.75 m,平均4.23 m,煤层结构复杂,煤层整体倾向西南,倾角0°~10°平均5°。10#煤层结构复杂,该煤层为井田稳定可采煤层,层理、节理不发育。对回采没有影响。10#煤层直接顶4~6 m的砂质泥岩、泥岩,直接底板为2~5 m砂岩、砂质泥岩,老底为11#煤。

Numerical analysis on water-inrush process due to floor heave

To investigate the water-inrush process due to floor heave,simulation model was made and factors of mining height,immediate roof strength,water pressure,depth and strength of confiningbed,excavation step distance and bury depth were analyzed by using UDEC software.Five zones theory (containing two maximum main stress circles and three maximum main stress stratiform zones) along excavation direction was proposed, and two-ends-fixed beam mechanical model in maximum main stress circle was estab- lished.It is found that water inrush always occurs at the end of the beam where shear stress is higher,that is to say,it always occurs at near the starting cut and working face. Water pressure,height and strength of confiningbed are the determined factors,and min- ing height,immediate roof strength,excavation step distance and bury depth effect water inrush process due to floor heave.