裂隙岩体巷道围岩最大可动区域解算研究

Study on solution to the maximum movable region of the surrounding rock in fractured rock mass roadways

开展裂隙岩体巷道围岩最大可动区域解算研究,对于巷道安全开挖及长期使用具有重要意义。基于关键块体理论矢量运算求解方法,结合一般块体理论可限定结构面半径的独特优势,解决代表性结构面组选择问题,简化块体可动区域求解过程,形成一种快速准确确定裂隙岩体巷道围岩最大可动区域的研究方法。以广西铜坑矿92号矿体405m水平2~#盘区3~#裂隙凿岩道结构面数据为基础,利用所研发技术,开展复杂裂隙环境下巷道围岩最大可动区域解算研究的实例验证,计算结果表明:3~#凿岩道关键块体主要集中于拱形巷道断面左侧,开挖过程需重点进行左侧部位的支护,以保持围岩稳定。研究成果对于地下矿山裂隙岩体巷道围岩危险区域确定工作具有重要指导作用。

Conducting the calculation study of the maximum movable region of the surrounding rock in fractured rock mass roadways is of great significance for the safe excavation and long-term use of roadways. Based on the vector operation method of the key block theory and the unique advantage of the general block theory(i.e., the discontinuity radius can be limited), the traditional determination method of representative discontinuities is improved;the solution procedure of block movable region is simplified;and a method in which the maximum movable region of the surrounding rock can be determined rapidly and accurately is developed. Finally, the method is applied to the real case(i.e., the 3#roadway of 2~# panel at the 405 m level of No.92 orebody in Tongkeng mine, Guangxi), and the results have shown that the key blocks of the 3~# roadway are mainly concentrated on the left side of the arched roadway section. In the excavation process, more support should be focused on the left side to keep the surrounding rock stable. In conclusion, this study may provide important guidance for the determination of the surrounding rock danger zones in fractured rock mass roadway of underground mines.