摘要
九顶山钼矿底部出矿巷道围岩以蚀变花岗斑岩为主,节理裂隙高度发育,是典型的破碎软岩。目前所用的钢支架支护无法控制该类巷道的大变形,考虑采用锚喷网支护。利用修正后的Hoek-Brown破坏准则计算蚀变花岗斑岩岩体强度,作为支护研究的基础;对锚杆间距和喷射混凝土厚度的不同取值进行正交设计,拟定出9种支护方案,利用FLAC3D计算比选出最优方案用于支护试验。该方案要求锚杆间距1.0m,喷射混凝土厚度0.06m。出矿巷道支护试验与收敛变形监测结果显示,该锚喷网支护方案能有效地控制巷道变形,两监测断面围岩在各自开始监测的54d和40d后趋于稳定。断面顶底板移近量、两帮挤进量平均值分别为40.98mm和55.92mm。
The surrounding rock of bottom ore-drawing drift in Jiudingshan molybdenum mine,mainly as altered granite porphyry,is a kind of typical broken and soft rock with high developed joints.The bolting and shotcreting net support was considered to use,because the present steel support couldn't control the large deformation of the drift.The rock mass strength of altered granite porphyry was calculated as the foundation for support research by modified Hoek-Brown failure criterion.The orthogonal designs of bolt interval and shotcrete thickness with different values were conducted to protocol nine support methods.And the best method was chosen for support tests by FLAC3 D,which required that the bolt interval was 1.0mand the shotcrete thickness was 0.06 m.The results of support experiments and convergence monitoring showed that the support method could effectively control the drift deformation,and the surrounding rock of two monitoring sections tended to be stable after monitoring54 days and 40 days.The average displacement between roof and floor was 40.98 mm,and between the two side walls was 55.92 mm.
出处
《矿业研究与开发》
CAS
北大核心
2015年第3期35-41,共7页
Mining Research and Development
基金
"十二五"国家科技支撑计划项目(2012BAB08B02)
国家自然科学基金重点项目(50934002)
长江学者和创新团队发展计划项目(IRT0950)
