Experimental Study on Methane Control Optimizing of the Super-length Fully Mechanized Top Caving Face

摘要

Aiming at the problem of methane concentration frequent exceeding limit in the super-length fully mechanized top caving face and based on thesimilarity theory,the experimental system on methane control optimizing was designed and manufactured,and the project of adopting double tail galleries isfirstly advanced.The experiments of different locality of single gallery and double galleries and changing flowage parameters such as wind rate are carded out,and the methane concentration of return airflow and gallery wind is observed.The experimental results show that the problem of methane concentrationexceeding limit couldn't be resolved if the measures such as using single gallery or increasing wind rate are adopted for the super-length fully mechanized topcaving face.The problem can be resolved if only the project of using double galleries through adding wind rate about 15%.The optimal locality is ascertainedfrom both safety and economy that they are about 35～65m and 130m from return laneway.