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1、精选优质文档-倾情为你奉上塔吊桩基础稳定性计算书阳江项目工程;工程建设地点:;属于结构;地上0层;地下0层;建筑高度:0m;标准层层高:0m ;总建筑面积:0平方米;总工期:0天。本工程由投资建设,设计,地质勘察,监理,组织施工;由担任项目经理,担任技术负责人。本计算书主要依据施工图纸及以下规范及参考文献编制:建筑基坑支护技术规程(JGJ120-99)。一、参数信息1.基坑基本参数基坑开挖深度H:4m; 桩直径d:0.6m;桩与土接触点深度H1:2m; 桩入土深度H2:5m;塔吊最大倾覆力矩M:100kNm; 主动土压力分配系数:0.7;基坑外侧水位深度hwa:3m; 基坑以下水位深度hwp:
2、1m;稳定性计算安全系数K:1.2;2.土层参数土层类型 厚度hi 重度i 浮重度mi 内聚力ci 摩擦角i (m) (kN/m3) (kN/m3) (kPa) ()粉土或砂土 4 18 20 10 30 粘性土 10 21 24 8 20 3.荷载参数布置方式 荷载值Pi(kPa) 距基坑边线距离l1(m) 作用宽度ai(m)满布 10 - - 局布 5 1 2 4.支撑参数序号 支撑点与填土面距离(m) 作用力(kN)1 0.5 20 示意图二、桩侧土压力计算1、水平荷载(1)、主动土压力系数:Ka1=tan2(45- 1/2)= tan2(45-30/2)=0.333;Ka2=tan2(
3、45- 2/2)= tan2(45-30/2)=0.333;Ka3=tan2(45- 3/2)= tan2(45-30/2)=0.333;Ka4=tan2(45- 4/2)= tan2(45-30/2)=0.333;Ka5=tan2(45- 5/2)= tan2(45-20/2)=0.49;Ka6=tan2(45- 6/2)= tan2(45-20/2)=0.49;(2)、土压力、地下水以及地面附加荷载产生的水平荷载:第1层土:0 1米;a1上 = P1Ka1-2C1Ka10.5 = 100.333-2100.3330.5 = -8.214kN/m;a1下 = (1h1+P1)Ka1-2C1K
4、a10.5 = 181+100.333-2100.3330.5 = -2.214kN/m;第2层土:1 2米;H2 = ihi/2 = 18/18 = 1;a2上 = 2H2+P1+P2a2/(a2+2l2)Ka2-2C2Ka20.5 = 181+10+2.50.333-2100.3330.5 = -1.38kN/m;a2下 = 2(H2+h2)+P1+P2a2/(a2+2l2)Ka2-2C2Ka20.5 = 18(1+1)+10+2.50.333-2100.3330.5 = 4.62kN/m;第3层土:2 3米;H3 = ihi/3 = 36/18 = 2;a3上 = 3H3+P1+P2a2
5、/(a2+2l2)Ka3-2C3Ka30.5 = 182+10+2.50.333-2100.3330.5 = 4.62kN/m;a3下 = 3(H3+h3)+P1+P2a2/(a2+2l2)Ka3-2C3Ka30.5 = 18(2+1)+10+2.50.333-2100.3330.5 = 10.62kN/m;第4层土:3 4米;H4 = ihi/4 = 54/18 = 3;a4上 = 4H4+P1+P2a2/(a2+2l2)Ka4-2C4Ka40.5 = 183+10+2.50.333-2100.3330.5 = 10.62kN/m;a4下 = 4H4+P1+P2a2/(a2+2l2)Ka4-
6、2C4Ka40.5+h4Ka4+0.5wh42 = 183+10+2.50.333-2100.3330.5+2010.333+0.51012 = 22.286kN/m;第5层土:4 5米;H5 = H4 = 3;a5上 = 5H5+P1+P2a2/(a2+2l2)Ka5-2C5Ka50.5+h5Ka5+0.5wh52 = 213+10+2.50.49-280.490.5+2410.49+0.51012 = 42.581kN/m;a5下 = 5H5+P1+P2a2/(a2+2l2)Ka5-2C5Ka50.5+h5Ka5+0.5wh52 = 213+10+2.50.49-280.490.5+242
7、0.49+0.51022 = 69.348kN/m;第6层土:5 9米;H6 = H5 = 3;a6上 = 6H6+P1Ka6-2C6Ka60.5+h6Ka6+0.5wh62 = 213+100.49-280.490.5+2420.49+0.51022 = 68.122kN/m;a6下 = 6H6+P1Ka6-2C6Ka60.5+h6Ka6+0.5wh62 = 213+100.49-280.490.5+2460.49+0.51062 = 275.19kN/m;(3)、水平荷载:临界深度:Z0=(a2下h2)/(a2上+ a2下)=(4.621)/(1.384.62)=0.77m;第1层土:Ea
8、1=0kN/m;第2层土:Ea2=0.5Z0a2下=0.50.774.62=1.778kN/m;作用位置:ha2=Z0/3+hi=0.77/3+7=7.257m;第3层土:Ea3=h3(a3上+a3下)/2=1(4.62+10.62)/2=7.62kN/m;作用位置:ha3=h3(2a3上+a3下)/(3a3上+3a3下)+hi=1(24.62+10.62)/(34.62+310.62)+6=6.434m;第4层土:Ea4=h4(a4上+a4下)/2=1(10.62+22.286)/2=16.453kN/m;作用位置:ha4=h4(2a4上+a4下)/(3a4上+3a4下)+hi=1(210.
9、62+22.286)/(310.62+322.286)+5=5.441m;第5层土:Ea5=h5(a5上+a5下)/2=1(42.581+69.348)/2=55.964kN/m;作用位置:ha5=h5(2a5上+a5下)/(3a5上+3a5下)+hi=1(242.581+69.348)/(342.581+369.348)+4=4.46m;第6层土:Ea6=h6(a6上+a6下)/2=4(68.122+275.19)/2=686.623kN/m;作用位置:ha6=h6(2a6上+a6下)/(3a6上+3a6下)+hi=4(268.122+275.19)/(368.122+3275.19)+0=
10、1.598m;土压力合力:Ea= Eai= 1.778+7.62+16.453+55.964+686.623=768.438kN/m;合力作用点:ha= hiEai/Ea= (1.7787.257+7.626.434+16.4535.441+55.9644.46+686.6231.598)/768.438=1.95m;2、水平抗力计算(1)、被动土压力系数:Kp1=tan2(45+ 1/2)= tan2(45+20/2)=2.04;Kp2=tan2(45+ 2/2)= tan2(45+20/2)=2.04;(2)、土压力、地下水产生的水平荷载:第1层土:4 5米;p1上 = 2C1Kp10.5
11、 = 282.040.5 = 22.85kN/m;p1下 = 1h1Kp1+2C1Kp10.5 = 2112.04+282.040.5 = 65.682kN/m;第2层土:5 9米;H2 = ihi/2 = 21/21 = 1;a2上 = 2H2Kp2+2C2Kp20.5 = 2112.04+282.040.5 = 65.682kN/m;a2下 = 2H2Kp2+2C2Kp20.5+h2Kp2+0.5wh22 = 2112.04+282.040.5+2442.04+0.51042 = 341.484kN/m;(3)、水平荷载:第1层土:Ep1=h1(p1上+p1下)/2=1(22.85+65.
12、682)/2=44.266kN/m;作用位置:hp1=h1(2p1上+p1下)/(3p1上+3p1下)+hi=1(222.85+65.682)/(322.85+365.682)+4=4.419m;第2层土:Ep2=h2(p2上+p2下)/2=4(65.682+341.484)/2=814.333kN/m;作用位置:hp2=h2(2p2上+p2下)/(3p2上+3p2下)+hi=4(265.682+341.484)/(365.682+3341.484)+0=1.548m;土压力合力:Ep= Epi= 44.266+814.333=858.599kN/m;合力作用点:hp= hiEpi/Ep= (44.2664.419+814.3331.548)/858.599=1.696m;三、桩侧弯矩计算1.主动土压力对桩底的弯矩M1 = 0.70.6768.4381.95 = 629.251kNm;2.被动土压力对桩底的弯矩M2 = 0.6858.5991.696 = 873.935kNm;3.支撑对桩底弯矩M3 = 170kNm;四、基础稳定性计算M3+M2K(M+M1)170+873.935=1043.935kNm 1.2(100+629.251)=875.101kNm;塔吊稳定性满足要求!专心-专注-专业