关键词: 破碎围岩, 掘进巷道, 压密层, 支护技术

Abstract: Aiming at the problems of high support cost and easy to be damaged by ground pressure in fractured rock roadway，taking Baoxiu mining area of Hainan Iron Mine as the engineering background， the concept of fine support based on compaction layer protection is proposed. According to the borehole de⁃ tection image，the fractured rock roadway could be divided into internal fragmentation layer，compaction layer，external fragmentation layer and original rock layer from the surface to the inside of the rock mass. The compaction layer is formed in the process of excavation and blasting，and the internal and external cracks obtain expansion space and further develop to form internal and external fracture layers，which leads to roadway roof fall and failure. Based on this mechanism，the key of fine support of broken surround⁃ ing rock roadway is to protect the stability of compaction layer and limit the crushing and swelling space of fractured surrounding rock. The timely support form of bolt mesh shotcrete and anchor cable is proposed and tested in roadway of fragmental surroundings in Baoxiu mining area. The industrial test results show that the timely support form of bolt mesh shotcrete and anchor cable，that is，bolt mesh shotcrete closely follows the support of the working face and the secondary support of anchor cable for 3~5 cycles according to the ground pressure appearance speed，can highly adapt to the ground pressure failure law of the broken surrounding rock roadway in Baoxiu mining area and effectively ensure the stability of the broken surround⁃ ing rock roadway.

Key words: roadway of fragmental surroundings, driving roadway, compaction layer, support technology