高强度钢纤维混凝土的力学特征及在高应力软岩巷道中的应用  

Mechanical properties of high strength steel fiber concrete and its application in support of high stress and soft rock roadway

作　　者：梁新民[1,2] 张永达[1,2] 单强[3] 明世祥[1,2] 

机构地区：[1]金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与环境工程学院,北京100083 [3]中国地质科学院郑州矿产综合利用研究所,郑州450006

出　　处：《有色金属（矿山部分）》2015年第5期54-59,共6页NONFERROUS METALS(Mining Section）

摘　　要：为了满足高应力软岩巷道对于支护材料高强度、高韧性的要求,本研究提出在素混凝土中掺入适量高性能钢纤维的方法来改善混凝土的整体力学性能。通过室内试验,对3类高强度钢纤维混凝土及素混凝土试块进行力学性能对比试验,得出在钢纤维体积掺率为1.01%下B型钢纤维具有更好的抗变形和抗冲击性能。以围压恢复加固理论为指导,研究提出了浇灌钢纤维混凝土、全长锚固预应力树脂锚杆被动和主动联合支护结构,配合壁后接顶充填和浇注底梁等关键技术,建立形成了一整套适用于高应力软岩巷道的支护体系。历经两年多的现场应用、监测,实现了对高应力软岩巷道的围岩变形的有效控制,为矿山企业安全作业奠定基础。In order to satisfy the requirement of high strength and toughness in the high stress soft rock roadway, appropriate amount of high performance steel fiber is added in the concrete to improve the overall mechanical performance of concrete. Based on the mechanical performance contrast tests of three kinds of high performance steel fiber concretes and plain concrete Blocks, it is concluded that the type B steel fiber has a better resistance to deformation and impact resistance under the steel fiber volume fraction of 1. 01%. With the guidance of the confirming pressure restoring theory, the passive and active combined supporting structure are proposed, which is composed of high strength steel fiber concrete and fully anchored pre-stressed resin bolts. Cooperated with other key techniques such as wall back roof contacted filling and placing of bottom beam, a set of supporting system for high stress and soft rock roadway are formed. After more than two years of field monitoring, the effective control of surrounding rock deformation in high stress soft rock tunnel excavation is realized, and it lays a foundation for safe production in mining enterprise.

关 键 词：软岩巷道 高强度钢纤维 对比试验 联合支护 

分 类 号：TD313[矿业工程—矿井建设]