采矿与安全工程学报2017，Vol.34Issue(2)：243-250,8.DOI:10.13545/j.cnki.jmse.2017.02.007
大断面极软岩巷道钢管混凝土支架复合支护技术
Composite supporting technology of concrete-filled steel tubular support in extremely soft rock roadway with large section
摘要
Abstract
To solve the supporting issues of severe deformation of large-section-soft-rock roadway in the temporary water sump (level +786 m underground) in Qingshuiying mine, the characteristics of roadway deformation and failure were investigated, the physical and mechanical parameters of the sur-rounding rock samples were tested, and reasons for surrounding rock deformation and failure were ana-lyzed. The research has found that the surrounding rock in the temporary water sump has the property of high swelling and extreme softness, and its deformation was mainly caused by slipping and expansion of clay minerals. Based on the research above, an enclosed composite supporting scheme was proposed, which integrated erect elliptic concrete-filled steel tubular support (CFST support), bolt-mesh-shotcret- ing, strengthening anchor cable, and steel fiber reinforced concrete arch wall, mechanical model of strengthening confined ring mainly based on CFST support was established, and theoretical calculation indicates that the confined ring structure can supply 1.99 MPa supporting resistance for the outside sur-rounding rock. After that, the supporting effect of different section shapes were analyzed through FLAC3Dto verify the rationality of the design scheme. The composite support technique has been suc- cessfully applied in the underground site for more than 3 years, and the accumulative deformation of surrounding rock is less than 100 mm. Meanwhile, each supporting structure has good mechanical per-formance, which can effectively control the severe deformation of surrounding rock.关键词
大断面/极软岩/钢管混凝土支架/承压环/封闭式/复合支护Key words
large section/extremely soft rock/concrete-filled steel tubular support (CFST support)/confined ring/enclosed type/composite support分类
矿业与冶金引用本文复制引用
刘珂铭,高延法,张凤银..大断面极软岩巷道钢管混凝土支架复合支护技术[J].采矿与安全工程学报,2017,34(2):243-250,8.基金项目
国家自然科学基金项目(51474218) （51474218）
