层次注浆工艺在松软巷道破碎围岩加固中的应用

煤层回采过程中,受支撑应力的作用工作面前方煤岩体被破坏,注浆技术是控制煤岩体破坏的有效途径,而注浆工艺对于注浆效果的优劣具有重要意义。以山西某矿为试验矿井,采用层次注浆工艺和传统注浆工艺对其巷道破碎围岩进行加固,并对注浆效果进行对比分析。数据表明:层次注浆工艺注浆速度较传统注浆工艺快了40%;层次注浆工艺段巷道变形量明显小于传统注浆工艺段;层次注浆工艺能使浆液在煤岩体裂隙内得到有效充填,完整性有较大提高;层次注浆工艺煤壁有较小部分落下,但不影响采煤机正常回采,而传统注浆工艺煤壁比较破碎,完整性差;层次注浆工艺整体优于传统注浆工艺。

Applications of Level Grouting Process in Soft Roadway to Reinforce Broken Surrounding Rock

In coal seam recovery process,the coal and rock in front of working face are damaged in the effect of supporting stress.Grouting technology is a very effective method to control coal and rock damage,and grouting process is important in grouting effect.Taking a coal mine in Shanxi as an experimental mine,the broken surrounding rock was reinforced by the level grouting process and traditional grouting process,and their grouting effects were analyzed.The results show that:(1) The grouting layer grouting process is faster than traditional grouting process by 40％;(2) Deformation of the roadway with level grouting process is much smaller than that of the traditional grouting process;(3) The level grouting process can make slurry effectively filling in coal and rock cranny,improving overall integrity;(4) Coal wall with the level grouting process has a small part of falling off,but it does not affect the normal stoping of shearer,while coal wall with traditional grouting technology is broken and its integrity is poor;(5) The level grouting process is superior to the traditional grouting process as a whole.