通过调研分析法归纳现行悬伸腿接合结构,梳理其在造型、结构、拆装等方面的优缺点,采用问卷调查及拆装实验对椅子悬伸腿结构设计痛点进行了研究,并以此为基础提出改良设计方案,对悬伸腿节点的结构及造型进行设计实践。悬伸腿结构椅类家...通过调研分析法归纳现行悬伸腿接合结构,梳理其在造型、结构、拆装等方面的优缺点,采用问卷调查及拆装实验对椅子悬伸腿结构设计痛点进行了研究,并以此为基础提出改良设计方案,对悬伸腿节点的结构及造型进行设计实践。悬伸腿结构椅类家具的实际消费者中,59.40%的用户认为悬伸腿结构家具的拆卸时长过长;而未购买过的潜在消费者中,58.82%的用户较为担心产品稳定性的问题。拆装观察实验结果表明,平直垫片与自攻螺丝组合的典型方式安装时长的平均值为7 min 48 s,拆卸时长为3 min 16 s,且拆装过程中易出错,用户体验感不佳。现行典型结合方式五金外露,美观度、拆装便捷度均亟需优化,所提出的嵌入式垫片与紧固件组合接合、榫与螺栓组合接合两个方案,可显著提升节点外观实木质感,优化拆装流程。展开更多
The seven long tunnels of Jinping II hydropower station are deeply buried.The width and evolution characteristics of excavation damaged zone(EDZ)are the key problem to the design of tunnels excavation and supports.In ...The seven long tunnels of Jinping II hydropower station are deeply buried.The width and evolution characteristics of excavation damaged zone(EDZ)are the key problem to the design of tunnels excavation and supports.In order to study this problem,several specific experimental tunnels with different overburden and geometric sizes were excavated at this site.Digital borehole camera,sliding micrometer,cross-hole acoustic wave equipment and acoustic emission apparatus were adopted.This paper introduced the comprehensive in situ experimental methods through pre-installed facilities and pre-drilled boreholes.Typical properties of the surrounding rock mass,including cracks,deformation,elastic wave and micro fractures,were measured during the whole process of the tunnel excavation.The width and characteristics of formation and evolution of tunnels EDZ were analyzed under different construction methods involving of TBM and drilling and blasting,the test tunnels were excavated by full-face or two benches.The relationships between EDZ and tunnel geometry sizes,overburden and excavation method were described as well.The results will not only contribute a great deal to the analysis of rock mass behavior in deeply buried rock mass,but also provide direct data for support design and rockburst prediction.展开更多
文摘通过调研分析法归纳现行悬伸腿接合结构,梳理其在造型、结构、拆装等方面的优缺点,采用问卷调查及拆装实验对椅子悬伸腿结构设计痛点进行了研究,并以此为基础提出改良设计方案,对悬伸腿节点的结构及造型进行设计实践。悬伸腿结构椅类家具的实际消费者中,59.40%的用户认为悬伸腿结构家具的拆卸时长过长;而未购买过的潜在消费者中,58.82%的用户较为担心产品稳定性的问题。拆装观察实验结果表明,平直垫片与自攻螺丝组合的典型方式安装时长的平均值为7 min 48 s,拆卸时长为3 min 16 s,且拆装过程中易出错,用户体验感不佳。现行典型结合方式五金外露,美观度、拆装便捷度均亟需优化,所提出的嵌入式垫片与紧固件组合接合、榫与螺栓组合接合两个方案,可显著提升节点外观实木质感,优化拆装流程。
基金supported by the National Basic Research Program of China("973"Program)(Grant No.2010CB732006)the National Natural Science Foundation of China(Grant No.40902091)supported by the CAS/SAFEA International Partnership Program for Creative Research Teams
文摘The seven long tunnels of Jinping II hydropower station are deeply buried.The width and evolution characteristics of excavation damaged zone(EDZ)are the key problem to the design of tunnels excavation and supports.In order to study this problem,several specific experimental tunnels with different overburden and geometric sizes were excavated at this site.Digital borehole camera,sliding micrometer,cross-hole acoustic wave equipment and acoustic emission apparatus were adopted.This paper introduced the comprehensive in situ experimental methods through pre-installed facilities and pre-drilled boreholes.Typical properties of the surrounding rock mass,including cracks,deformation,elastic wave and micro fractures,were measured during the whole process of the tunnel excavation.The width and characteristics of formation and evolution of tunnels EDZ were analyzed under different construction methods involving of TBM and drilling and blasting,the test tunnels were excavated by full-face or two benches.The relationships between EDZ and tunnel geometry sizes,overburden and excavation method were described as well.The results will not only contribute a great deal to the analysis of rock mass behavior in deeply buried rock mass,but also provide direct data for support design and rockburst prediction.
