随着矿井开采深度的不断加深,矿压越来越大,留设煤柱保护巷道的困难程度有增无减。加大护巷煤柱尺寸往往也无济于事。随着开采技术的发展和巷道支护方式的改进,西德、苏联、英国等从五十年代开始研究和试验无煤柱护巷开采,七十年代在井下普遍采用。我国约有30多个矿区先后采用了无煤柱 With the continuous deepening of mining depth, mine pressure is increasing, leaving the pillar to protect tunnels more difficult. Increasing the size of roadway pillars often helpless. With the development of mining technology and the improvement of roadway support methods, West Germany, the Soviet Union and the United Kingdom started to study and test the mining of coal pillar-free lanes in the 1950s and were commonly used underground in the 1970s. About 30 mines in our country have successively adopted non-pillars