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1、1围岩压力计算 深埋和浅埋状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、施工措施等因素综合判断。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，=； 垂直均布压力(km2)； 围岩垂直重度（kN/3)。二次衬砌承受围岩压力的比例按下表取值：表. 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 0100安全储藏安全储藏10080安全储藏20760304040560330085浅埋地段503050606001.1 浅埋隧道围岩压力的计算措施
2、隧道的埋深H不小于hq而不不小于Hp时，垂直压力。表4. 各级围岩的值及值围岩级别.9（0.70.9)（0.0.7）60706005侧压力系数作用在支护构造两侧的水平侧压力为:e1=h ；2=(+Ht） 侧压力视为均布压力时:级围岩的等效荷载高度hq=0.4524+0.1(15）1.mH=2.5hq=2m,H,故为浅埋。取0=45,0.6027，h20m,tan=3.02,0.22,tn=.,计算简图：垂直压力q120(1-0.222.51/10)=29Kg=d=.42531.4K/m地基反力32.5K/me1=h=192004=85.12e2(Ht)=19(217)0224=9水平均布松动压
3、力=（e1+e)/=0.51KNm级围岩二衬按承受5%围岩压力进行计算,则垂直压力为q0%=1.59KN/地基反力为P50%=16229N/m水平压力为e0=525N/m2衬砌构造内力计算表4.7 等效节点荷载节点号XYFxFY1202.742591544.464304.61672146.394732072.751461543.9242642.9739793686552407.0531543.57636256.1123988161535202873244154.046045973.82514776.30132207.9743381542.9864419.608266.97654703.2187
4、5114273390744060.144586207.65141211801147697445749745139274.15404115.368535.04376469728.97104120746666851.62653.298327907931120515854.50065580.691388421.8746122075.68979151.42074898.3478.55141206.20743151.9739852851644039142076779171541.306479217.425856.66015207.498414.27841920.31648584.885412772341
5、5.6990920.4626612610.584317208.499.20878.4004098059.57121808.816151.31134-101.6338599.776292079.695541.6126-2081.15879809162209.894154143057530776018506.3842280.70015191-408528508.42922200.88141541.626929-55.386718457.00323081.3832154173702-6037527399.86182081.8048154.899313-709.47188318.8433225082.
6、25415421624594.51533749.4218228.0844142.864-47.470152646.581322082.11931346449236.065063685.679128208.644291543.507634-35888672246.67228228036537432973.12514776.3012202.2911544.3964-2256112339886.16151302082706135154.0254764273974953.685212.57345.64423046167146312432202.1761546.21888-5817.57933-1486
7、.1653308216871546.7348-4895.6212641.885983481851152818-3376.67-3959892832081.485457.7547731286.59479-166.5041201.58041548182418-8661.1968-62898.8811832080.5291515.54732555.795-306.1921438280.0662071486714-2.50-81971.412939209.554.14945-1063.3237-89480.8224008916159.94573-182.6-547295412078452715.434
8、08-9350261-9982070784207.7459159.49864415.489-10238.770543207.13990854.4034801032.782407.546013149.2574715.4383102476314575.9956149.14949350.6461999802.0007.1897558.867413825.06984-9545.73687424.902261548.547831806.2489480.089848074.269815882418219925075-8191.419927400007547.55477255.399-7306.482036
9、2672172801888661.19683-298.818512073331146.7381286.595-5161.0415220751154.218336.606-953853272.88782.64245.6602674.85854272.77947145.04254517.57908-146.2398表4.8轴力、剪力、弯矩具体数据节点号轴力弯矩剪力-892+05-1456-109958.3E+-8352.66813-.73+21398-1.9E+058E+06686-1.2E055-.69E+05157E+055276-780E+01.69E+05.6+072.08E+679062
10、339838-2066-11625749-.05E0-512931-2.04E06-434725311-0306-60967312-2.02E+0-7813390913-2.02+6-81414471-2.02+6-865402668815-202+06-8720-7193.616-.006-855246717-2.02E+06-7943094718-2.0E+6-69844269819-2.0E06-7093-3214820-.05E+641637-369121-20+06-24058-3822-2.08E+065056.44293-7.88E+545533.0E+524-.2+0160E+5
