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一、前言在东川矿务局因民矿面山坑急倾斜矿体连续空场采矿法试验中,由于不留间柱,矿体上盘围岩完全依靠顶柱和底柱支撑。因此,该采矿法成败的关键,在一定程度上将取决于顶柱的稳定性。为了掌握回采过程中顶柱及上、下盘围岩的应力状态及其随上盘暴露面积增大而变化的趋势,以便为采场地压控制提供依据,该矿决定用超声波等手段进
I. INTRODUCTION In the Dongchuan Coal Mining Bureau’s continuous empty-field mining test for the steep tilting ore body in the shale pit of the Minmetals Mine, the surrounding rock of the ore body was completely supported by the top column and the bottom column because no column was left. Therefore, the key to the success or failure of the mining method will depend to a certain extent on the stability of the pillar. In order to grasp the stress state of the top pillars and surrounding rock of the upper and lower plates during the mining process, and the trend of change with the increase of the exposed area of the upper plate, so as to provide a basis for the control of the site pressure, the mine decided to use ultrasonic methods.