铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2015年
5期
115-118,119
,共5页
公路隧道%震后偏压坡积体%进洞施工%数值分析%力学效应
公路隧道%震後偏壓坡積體%進洞施工%數值分析%力學效應
공로수도%진후편압파적체%진동시공%수치분석%역학효응
Highway tunnel%Biasing slope after earthquake%Portal construction%Numerical analysis%Mechanical effect
结合震后四川某地特长高速公路隧道洞口施工的实际工程，针对其提出的免刷坡进洞施工技术，开展震后偏压坡积体免刷坡进洞施工力学效应的分析，通过FLAC 3D有限差分软件计算分析，结果表明：在施工过程要提前作好安全防护准备；左洞洞顶地表呈斜坡状，在剪切应力作用下导致初期支护外侧出现大范围受拉区；该工法可以有效地防止隧道上方坡积土体的滑动，保证施工安全且有效缩短进洞时间，对隧道周围地表植被破坏较小。
結閤震後四川某地特長高速公路隧道洞口施工的實際工程，針對其提齣的免刷坡進洞施工技術，開展震後偏壓坡積體免刷坡進洞施工力學效應的分析，通過FLAC 3D有限差分軟件計算分析，結果錶明：在施工過程要提前作好安全防護準備；左洞洞頂地錶呈斜坡狀，在剪切應力作用下導緻初期支護外側齣現大範圍受拉區；該工法可以有效地防止隧道上方坡積土體的滑動，保證施工安全且有效縮短進洞時間，對隧道週圍地錶植被破壞較小。
결합진후사천모지특장고속공로수도동구시공적실제공정，침대기제출적면쇄파진동시공기술，개전진후편압파적체면쇄파진동시공역학효응적분석，통과FLAC 3D유한차분연건계산분석，결과표명：재시공과정요제전작호안전방호준비；좌동동정지표정사파상，재전절응력작용하도치초기지호외측출현대범위수랍구；해공법가이유효지방지수도상방파적토체적활동，보증시공안전차유효축단진동시간，대수도주위지표식피파배교소。
With reference to the practices in portal construction of a highway tunnel in Sichuan where tunnel portal construction without treatment to biasing slope after earthquake, a mechanics analysis is conducted with finite difference software FLAC 3D of such tunnel portal construction. The results show that protective measures must be taken before the construction and a wide tensile zone is created outside the primary support due to shear stress generated by the tilted surface above the tunnel top and the method can effectively prevent the soil above the tunnel from sliding, which not only ensures safe construction and but also shortens the time to get into the tunnel with less destruction to the vegetation around the tunnel.
