乌石山隧道结构检算.doc

结构检算乌石山隧道二次模筑衬砌强度安全检算计算：复核：审核：铁道部第四勘测设计院城地处日期：1999.6 本次检算对、类围岩中的二次模筑衬砌按单独承受70%松散荷载作用，采用荷载结构模式进行了强度检算。共计算了三个断面：1类围岩衬砌断面2类围岩加强衬砌断面3类围岩衬砌断面一、 计算原则和方法将二次模筑衬砌视为单独结构，采用SAP84软件解算衬砌内力，按规范要求检算各截面的安全系数。二、荷载 计算荷载按规范采用，且计算中选用的物理力学指标按规范值下限取值，而侧压系数按规范值上限取值。二、 采用规范 公路隧道设计规范JTJ026-90 铁路隧道设计规范TBJ 3-96 混凝土结构设计规范GBJ 10-89四、计算结果和结论 规范要求混凝土结构在主要荷载作用下的抗压强度安全系数不得低于2.4；钢筋混凝土结构在主要荷载作用下的抗压强度安全系数不得低于2.0。（参见公路隧道设计规范）、围岩二次模筑衬砌计算荷载及内力见图1图12。衬砌截面的安全系数见表1。从表1可见二次模筑衬砌各截面的强度安全系数均高于规范值。因此，本隧道模筑衬砌足够安全，复合衬砌是可靠的。二次模筑衬砌各截面的强度安全系数 表1安全系数 衬砌及荷载 截面号类衬砌类加强衬砌类衬砌均载偏载均载偏载均载偏载12.082.6742.2840.912.873.08228.5923.378.906.704.264.0538.715.3816.6322.323.092.87413.0719.1714.2318.033.323.1158.4456.9417.4816.043.733.95616.5317.5232.3234.0750.3549.53718.1022.7135.188.642.602.46815.1322.7734.3737.9054.0262.4297.8916.4417.6023.8430.0039.521017.077.7718.889.8017.239.751124.5115.3545.4033.8329.1048.491234.5729.182.803.082.552.801337.4537.582.442.442.122.111434.5729.622.802.532.552.321524.5233.5445.4051.3259.1070.881617.0728.2618.8825.9817.2327.48177.8914.8617.6010.130.0020.851815.138.2634.3725.2654.0245.841918.1013.1435.1831.142.6055.492016.5315.1732.3230.7650.3543.89218.45510.0717.4818.143.733.512213.078.3814.2310.143.323.50238.78.4816.6311.843.093.272428.5931.118.9011.844.264.24252.082.2330.2337.332.872.61262.902.812.894.012.613.00二次模筑衬砌各截面的强度安全系数 续表1安全系数 衬砌及荷载 截面号类衬砌类加强衬砌类衬砌均载偏载均载偏载均载偏载2738.4037.462.595.685.154.972867.0175.162.482.462.502.52292.302.122.452.402.722.68302.362.132.512.484.013.83312.962.753.933.726.426.333288.4690.675.545.447.677.643380.4688.495.955.957.777.763488.4689.115.545.637.677.68352.963.193.934.146.426.49362.362.632.512.464.014.20372.302.592.452.412.72