烏石山隧道結(jié)構(gòu)檢算

結(jié)構(gòu)檢算烏石山隧道二次模筑襯砌強(qiáng)度安全檢算

烏石山隧道二次模筑襯砌強(qiáng)度安全檢算計(jì)算:復(fù)核:審核:鐵道部第四勘測(cè)設(shè)計(jì)院城地處日期：1999.6本次檢算對(duì)I、II類圍巖中的二次模筑襯砌按單獨(dú)承受70%松散荷載作用，采用荷載一一結(jié)構(gòu)模式進(jìn)行了強(qiáng)度檢算。共計(jì)算了三個(gè)斷面：1.1類圍巖襯砌斷面2.II類圍巖加強(qiáng)襯砌斷面3.II類圍巖襯砌斷面一、計(jì)算原則和方法將二次模筑襯砌視為單獨(dú)結(jié)構(gòu)，采用SAP84軟件解算襯砌內(nèi)力，按《規(guī)范》要求檢算各截面的安全系數(shù)。計(jì)算荷載按《規(guī)范》采用，且計(jì)算中選用的物理力學(xué)指標(biāo)按規(guī)范值下限取值，而側(cè)壓系數(shù)按規(guī)范值上限取值。二、采用規(guī)范《公路隧道設(shè)計(jì)規(guī)范》JTJ026-90《鐵路隧道設(shè)計(jì)規(guī)范》TBJ3-96《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》GBJ10-89四、計(jì)算結(jié)果和結(jié)論規(guī)范要求混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.4；鋼筋混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.0。（參見《公路隧道設(shè)計(jì)規(guī)范》）《鐵路隧道設(shè)計(jì)規(guī)范》TBJ3-96《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》GBJ10-89四、計(jì)算結(jié)果和結(jié)論規(guī)范要求混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.4；鋼筋混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.0。（參見《公路隧道設(shè)計(jì)規(guī)范》）《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》GBJ10-89四、計(jì)算結(jié)果和結(jié)論規(guī)范要求混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.4；鋼筋混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.0。（參見《公路隧道設(shè)計(jì)規(guī)范》）四、計(jì)算結(jié)果和結(jié)論規(guī)范要求混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.4；鋼筋混凝土結(jié)構(gòu)在主要荷載作用下的抗壓強(qiáng)度安全系數(shù)不得低于2.0。（參見《公路隧道設(shè)計(jì)規(guī)范》）1、11圍巖二次模筑襯砌計(jì)算荷載及內(nèi)力見圖1?圖12。襯砌截面的安全系數(shù)見表1。從表1可見二次模筑襯砌各截面的強(qiáng)度安全系數(shù)均高于《規(guī)范》值。因此，本隧道模筑襯砌足夠安全，復(fù)合襯砌是可靠的。二次模筑襯砌各截面的強(qiáng)度安全系數(shù)表1安全系數(shù)襯砌及荷載截面號(hào)I類襯砌11類加強(qiáng)襯砌II類襯砌均載偏載均載偏載均載偏載12.082.6742.2840.912.873.08228.5923.378.906.704.264.0538.715.3816.6322.323.092.87413.0719.1714.2318.033.323.1158.4456.9417.4816.043.733.95616.5317.5232.3234.0750.3549.53718.1022.7135.188.642.602.46815.1322.7734.3737.9054.0262.4297.8916.4417.6023.8430.0039.52

1017.077.7718.889.8017.239.751124.5115.3545.4033.8329.1048.491234.5729.182.803.082.552.801337.4537.582.442.442.122.111434.5729.622.802.532.552.321524.5233.5445.4051.3259.1070.881617.0728.2618.8825.9817.2327.48177.8914.8617.6010.130.0020.851815.138.2634.3725.2654.0245.841918.1013.1435.1831.142.6055.492016.5315.1732.3230.7650.3543.89218.45510.0717.4818.143.733.512213.078.3814.2310.143.323.50238.78.4816.6311.843.093.272428.5931.118.9011.844.264.24252.082.2330.2337.332.872.61262.902.812.894.012.613.00二次模筑襯砌各截面的強(qiáng)度安全系數(shù)續(xù)表1安全系數(shù)襯砌及荷載截面號(hào)I類襯砌11類加強(qiáng)襯砌II類襯砌均載偏載均載偏載均載偏載2738.4037.462.595.685.154.972867.0175.162.482.462.502.52292.302.122.452.402.722.68302.362.132.512.484.013.83312.962.753.933.726.426.333288.4690.675.545.447.677.643380.4688.495.955.957.777.763488.4689.115.545.637.677.68352.963.193.934.146.426.49362.362.632.512.464.014.20372.3