1围岩压力计算.doc

1围岩压力计算 深埋和浅埋情况下围岩压力的计算方式不同，深埋和浅埋的分界按荷载等效高度值，并结合地质条件、施工方法等因素综合判断按等效荷载高度计算公式如下：=（22.5） 式中: Hp——隧道深浅埋的分界高度； hq——等效荷载高度，=； q——垂直均布压力(kN/m2)； γ——围岩垂直重度（kN/m3)二次衬砌承受围岩压力的百分比按下表取值：表4.1 复合式衬砌初期支护与二次衬砌的支护承载比例 围岩级别初期支护承载比例二次衬砌承载比例双车道隧道三车道隧道双车道隧道三车道隧道Ⅰ Ⅱ100100安全储备安全储备Ⅲ100≥80安全储备≥20Ⅳ≥70≥60≥30≥40Ⅴ≥50≥40≥50≥60Ⅵ≥30≥30≥80≥85浅埋地段≥50≥30～50≥60≥60～801.1 浅埋隧道围岩压力的计算方法 隧道的埋深H大于hq而小于Hp时，垂直压力表4.3 各级围岩的值及值围岩级别ⅢⅣⅤθ0.9（0.7～0.9）（0.5～0.7）60°～70°50°～60°40°～50°侧压力系数作用在支护结构两侧的水平侧压力为：e1=γhλ ； e2=γ(h+Ht)λ 侧压力视为均布压力时：Ⅴ级围岩的等效荷载高度hq=0.45×24×[1+0.1×(10-5)]=10.8mHp=2.5hq=27m,H

取φ0=45°，θ=0.6φ0=27°，h=20m，tanβ=3.02,λ=0.224,tanθ=0.51,计算简图：垂直压力q=19×20(1-0.224×20×0.51/10)=293.18KN/mPg=πdγ=π×0.4×25=31.4KN/m地基反力P=324.58KN/me1=γhλ=19×20×0.224=85.12e2=γ(h+Ht)λ=19×(20+8.17)×0.224=119.89水平均布松动压力e=(e1+e2)/2=102.51KN/mⅤ级围岩二衬按承受50%围岩压力进行计算，则垂直压力为q×50%=146.59KN/m地基反力为P×50%=162.29KN/m水平压力为e×50%=51.255KN/m2衬砌结构内力计算表4.7 等效节点荷载节点号XYFxFY12072.1544.31304.661672146.32072.1543.26425.973974953.42072.1543.26256.112339886.52072.1543.25973.8182514776.3013222072.1542.24195.3650823664.9765472073.1542.20103.9075440260.1445862073.1541.8801214076.9074457497.4501392074.1541.736858935.69728.97104102074.1541.612446853.83279.07293112075.1541.5880.84021.81746122075.1541.420874898.84650.54514132076.207431541.3910.85164.40397142076.1541.2917.85562.69609152077.1541.278441920.85844.88594162077.1541.920.86010.58403172078.1541.80.86059.57127182078.816691541.-1081.6332485991.77462192079.336951541.-2081.85807.29146202079.1541.-3077.85506.38146212080.370071541.51917-4070.85089.42599222080.881491541.-5057.84557.0093232081.1541.-6037.83909.861782081.1541.-7009.83148.84332252082.1542.-9244.74199.42618242082.1542.-14047.4701552646.58913272082.1543.-19236.0650636865.64791282082.1543.-23588.8367322476.63737292082.1543.-25973.8182514776.30132262082.1544.-26256.112339886.302082.1545.-26425.973974953.312082.59731545.-31304.661672146.322082.1546.-35817.57933-13486.31665332082.1546.76348-34895.66231-26741.88598342081.857511547.-33376.67067-39539.88928352081.1547.-31286.59479-51661.35041362081.1548.-28661.19683-62898.88118372080.1548.-25545.39795-73060.19214382080.1548.-21992.50975-81971.4129392079.1549.-18063.32375-89480.08252402078.1549.-13825.06958-95457.72954412078.1549.-9350.-99802.07078422077.1549.-4715.-.7705432077.1549.0-.7082442076.1549.4715.-.7631452075.1549.9350.-99802.07078462075.1548.13825.06984-95457.73687472074.1548.18063.324-89480.08985482074.1548.21992.50975-81971.4129492074.1547.25545.39769-73060.18481502073.1547.28661.19683-62898.88118512073.1546.7634831286.59505-51661.35041522073.067511546.33376.67067-39539.88195532072.1545.34895.66205-26741.88598542072.1545.35817.57908-13486.32398表4.8 轴力、剪力、弯矩详细数据节点号轴力弯矩剪力1-8.92E+05-13456-109952-8.83E+05-8352.6-638913-8.73E+0521398-1.19E+054-8.61E+0576686-1.72E+055-8.69E+051.57E+05-252076-7.80E+051.69E+053.16E+057-2.08E+067906.2339838-2.06E+06-11168325749-2.05E+06-295192963810-2.04E+06-463472539511-2.03E+06-609672007312-2.02E+06-728131390913-2.02E+06-814427144.714-2.02E+06-8654026.68815-2.02E+06-87920-7193.616-2.02E+06-85526-1426717-2.02E+06-79433-2094718-2.03E+06-69844-2698819-2.04E+06-57093-3214820-2.05E+06-41637-3619121-2.07E+06-24058-3889122-2.08E+06-5056.4-4002923-7.88E+0514553-3.07E+0524-8.72E+051.60E+051869325-8.67E+051.51E+051.61E+0526-8.78E+05753211.12E+0527-8.89E+05228026085928-8.97E+05-57361042929-9.06E+05-10643-1582730-9.04E+05-976.56-1884631-8.96E+0510731-2262932-8.82E+0524936-2597333-8.61E+0541366-2494434-8.33E+0557370-1258435-7.99E+05660922076436-7.60E+05548444538037-7.22E+05288795781438-6.87E+05-4468.55896639-6.58E+05-384095047240-6.38E+05-671433459441-6.27E+05-862371407042-6.26E+05-92913-8065.143-6.37E+05-86224-2867644-6.57E+05-67117-4472845-6.85E+05-38371-5348046-7.19E+05-4418.2-5266647-7.57E+0528940-4064448-7.94E。