铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2015年
9期
109-111,112
,共4页
半棚式明洞%人字形曲柱%结构分析
半棚式明洞%人字形麯柱%結構分析
반붕식명동%인자형곡주%결구분석
Open cut tunnel of semi-shed%Herringbone curved column%Structure analysis
为了选择落石威胁下的严重偏压地形地段的合理工程方案，满足工程美学和环保要求，通过各种方案比选，提出一种新型结构形式—Z形刚架半棚式明洞。针对落石冲击荷载进行计算分析，分析结果表明：在各种冲击角度下，冲击荷载小于1800 kN时，各部位第一主应力均小于混凝土抗拉极限强度；Z形刚架半棚式明洞具有较强的抗落石冲击能力，具有较好的安全性。 Z形刚架半棚式明洞具有开挖小，能承受落石荷载较大，受力特性较好，结构美观，对沿途景观和植被破坏小，施工较为方便等优点，具有较好的应用前景，可给隧道设计、施工和研究提供有益的借鉴和参考。
為瞭選擇落石威脅下的嚴重偏壓地形地段的閤理工程方案，滿足工程美學和環保要求，通過各種方案比選，提齣一種新型結構形式—Z形剛架半棚式明洞。針對落石遲擊荷載進行計算分析，分析結果錶明：在各種遲擊角度下，遲擊荷載小于1800 kN時，各部位第一主應力均小于混凝土抗拉極限彊度；Z形剛架半棚式明洞具有較彊的抗落石遲擊能力，具有較好的安全性。 Z形剛架半棚式明洞具有開挖小，能承受落石荷載較大，受力特性較好，結構美觀，對沿途景觀和植被破壞小，施工較為方便等優點，具有較好的應用前景，可給隧道設計、施工和研究提供有益的藉鑒和參攷。
위료선택낙석위협하적엄중편압지형지단적합리공정방안，만족공정미학화배보요구，통과각충방안비선，제출일충신형결구형식—Z형강가반붕식명동。침대낙석충격하재진행계산분석，분석결과표명：재각충충격각도하，충격하재소우1800 kN시，각부위제일주응력균소우혼응토항랍겁한강도；Z형강가반붕식명동구유교강적항낙석충격능력，구유교호적안전성。 Z형강가반붕식명동구유개알소，능승수낙석하재교대，수력특성교호，결구미관，대연도경관화식피파배소，시공교위방편등우점，구유교호적응용전경，가급수도설계、시공화연구제공유익적차감화삼고。
In order to select reasonable engineering scheme for serious bias terrain area under rockfall threat and to meet the requirements for engineering aesthetics and environmental protection, this paper proposes a new type of semi-shed open cut tunnel with “Z”-shaped frame on the basis of scheme comparison. The results of the simulation analysis of rockfall impact load show that the first principal stress in every part of the structure is less than the ultimate tensile strength of concrete at variety of impact angles when the impact load is less than 1 800 kN. The open cut tunnel of semi-shed with“Z”-shaped frame has strong ability to resist rockfall impact and good safety performance. It has such advantages as less excavation, good bearing capacity for rockfall, good mechanical performances and fine shape, with less damage to the landscape and vegetation along the road. It is also featured with construction convenience and wide application, and may serve as reference for design, construction and research of the tunnel.
