Blocking rockfalls directly by reinforced concrete(RC) flat sheds with thick sand cushions is an outdated method. Such conventional sheds typically accumulate rock heavily, and become progressively damaged and are dif...Blocking rockfalls directly by reinforced concrete(RC) flat sheds with thick sand cushions is an outdated method. Such conventional sheds typically accumulate rock heavily, and become progressively damaged and are difficult to repair, and are very costly. To address these problems, we propose a new structure called a Graded Dissipating Inclined Steel Rock(GDISR) shed that utilizes the graded energy dissipation method. Here, we study the dynamic response of the GDISR shed with model test and numerical simulation, and give its optimization design combining with a practical engineering case. Our results show that the optimized modular E-block and corrugated steel tube can deform to sufficiently absorb the energy of different impact intensities. This efficiently and economically provides GDISR sheds with two security lines. Compared with conventional RC sheds, GDISR sheds with optimal incline have a more efficient anti-impact function, are faster and easier to repair, and are much simpler and cheaper to build.展开更多
基金supported by the National Key Basic Research Program of China(2016YFB0201003)the National Natural Science Foundation of China(41672356)the 135 Strategic Program of the Institute of Mountain Hazards and Environment,CAS(SDS-135-1704)
文摘Blocking rockfalls directly by reinforced concrete(RC) flat sheds with thick sand cushions is an outdated method. Such conventional sheds typically accumulate rock heavily, and become progressively damaged and are difficult to repair, and are very costly. To address these problems, we propose a new structure called a Graded Dissipating Inclined Steel Rock(GDISR) shed that utilizes the graded energy dissipation method. Here, we study the dynamic response of the GDISR shed with model test and numerical simulation, and give its optimization design combining with a practical engineering case. Our results show that the optimized modular E-block and corrugated steel tube can deform to sufficiently absorb the energy of different impact intensities. This efficiently and economically provides GDISR sheds with two security lines. Compared with conventional RC sheds, GDISR sheds with optimal incline have a more efficient anti-impact function, are faster and easier to repair, and are much simpler and cheaper to build.
文摘基于Rhino建模软件,根据地下矿山U型钢棚支护系统的结构和受力特点,建立了岩巷U型钢棚和煤巷U型钢棚支护系统的分析模型;以某地下矿山支护项目为例,查阅相关文献,结合实际资料以及经验类比法,估算U型钢棚静载加载载荷,选取600 kN载荷作为主要加载载荷,800 k N作为次要加载载荷,以研究破坏过程,考虑极端危险状态下,临空煤帮在模拟当中受侧压为0,结合实测资料及矿压观测经验,侧压系数选取1.2、1.5和1.8这3种情况,运用FLAC^(3D)软件,模拟2种U型钢棚支护在不同采空情况以及不同侧压系数下,工作载荷对应力集中以及形变的影响规律。结果表明:数值模拟结果真实地反映了U型钢棚支护系统的动力特征。随着埋深和相同时步下侧压系数的增加,侧压系数和钢棚所产生的塑性区破坏面积呈增加趋势。基于对U型钢棚铺设深度围压的分析,推荐U型钢棚静载承载压力应低于600 kN。
