地下连续墙设计计算
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6667设计计算
已知条件:
(1)土压力系数计算
主动土压力系数:
22 =0.84
/2)=tan=0.70 (45°—10°K=tan)(45°—φ/2a1a1122=0.72
=0.52 45°—18°/2K=tan)(45°—φ/2)=tan(a22a222=0.71
°—19.2°/2K=tan)(45°—φ/2)=tan=0.64 (45a33a322=0.70
—18.9/2)=tan (45°—φ/2)=tan=0.52 (45°K a4a4422=0.72
=0.41 φ/2)=tan (45°—19.2/2K=tan)(45°—a5a55被动土压力系数:22=1.40 )=tan (45°+19.2°/2)=1.98 K=tan (45°+φ/2p1p15(2)水平荷载和水平抗力的计算水平荷载计算:
=20×0.59-2×10×0.84=-5kPa e=qk-2C a1a0c=(20+18×2.5)×0.59-+2-2×10×0.84=21.55kPa
h)Kqe=(1a10ab1a1上c=(20+18×2.5)×0.36-K-22×19×0.6=0.6kPa
(e=q)+h2a20ab1a2下c=+(20+18×2.5+19.9×1.1)×0.36=e(q+-h)hK-22×19×2a2aca2012上0.6=8.48kPa
c =(20+18×2.5+19.9×1.1)×h)K-20.64-2×44q=(e×+h0.8=+3a321aca30下14.79kPa
-c)×)++qh+hh×1.418.81.119.92.520+18=-K2(×+×+(=e3a321a3ad03-2×44×0.8=2.05kPa
上0.64
c =(20+18×2.5+19.9×1.1+18.8×1.4)×e=(q+h-+h+h)K24a402a41ad3下0.34
-2×21×0.59=13.71kPa
c (20+18×2.5+19.9×1.1h+)K-2+18.8×1.4q=e(h+h+h+=4a42aea44031上
+19.9×0.5)×0.34-2×21×0.59=17.09kPa
c (20+18×2.5+19.9×-K)++++(=eqhhhh21.1+18.8×1.4=5a5a5ae43210下
+19.9×0.5)×0.41-2×20×0.64=24.9kPa
c (20+18×2.5+19.9×h)K-21.1=e(q++h+h18.8+h+h=+5a524a51af530
1.4+19.9×0.5+19.9×0.96)×0.41-2×20×0.64=3
2.73kPa
上×
水平抗力计算:
c=2×20×e=21.57=58.8kPa
5p1p上地面超载q=20kpa
a素填土0.34m0.6kpa22.95kpa b粘性土h=6.460m c8.48kpa粘性13.71kp2.05kp粉24.90kp17.09kp基坑底粘性32.73kp62.8kp粘性147.98kp46.93kpa
?E(3)墙后净土压力?E=×22.95×2.16+×(0.6+8.48)
×1.1+×2.05×1.4+×(13.71+17.09)×0.5+×(24.90+32.73)×0.96+×0.8×62.8=91.70kPa
?E作用点离地面的距离)4(.
121121222221.4?2.05????1.1??+?8.48??22.95?2.161.1??0.6
3223232?h
??222167.?00.0.?5?294.10.?5+??091?3.971?13.7?2322?
a91.701121
91.70122??0.96?(32.73?24.90)32?=0.6m
91.70?hk?2ck?1.74?19.9?2.46?2=e?20?1.57?147.9815p1p上p1
?hk?2ck?18.5?1.74?1.5=e1?2?43?1.23?154.392ppp1下2565?hk?2ck?18.5?
(h?1.74)?1.51?2?43?1.23?27.935h=e?57.17d26d6pp2上
???E=62.8?1.74?(?1.74?hh?1.74)?(147.98?62.8)?1.74h1.2E??
p211
dpaap220112??(27.94h?57.17?154.39)7154.394)?(h??(1.74)?1.74?h1.?+
ddd231112??1.2?1.0?[?22.95?2.16?(?2.16?h?5.7)?0.6?1.1?1.74)h?(?
dd3321111(?1.1?4.6?h)??(8.48?0.6)?1.1?(?1.1?4.6?h)??1.4?2.05
dd2232111?(?1.4?h?3.2)?13.71?0.5?(?0.5?h?2.7)?(17.09?13.71)?0.5
dd322111?(?0.5?2.7?h)?24.9?0.96?(?0.96?1.74?h)??(32.73?24.9)
dd32211?0.96?(?0.96?1.74?h)?32.73?1.74?(?1.74?h?1.74)?46.93?dd3212?1.74)]?(h
d232h?3h?2.25h?36.11?0=ddd解得h=2.72m 取2.8m
d??E?E有pa1?(62.8?48.554h?62.8)?h?66.58?32.73h0002解得h=1.15m
0.=254.82-53.94=200.88kN·m所以最大弯矩M= h-h pamax8102?M????0.025
s22?fbh14.3?600?96501c?=0.9873查表得s
=A2mm700??所以S?965?300h?f0.9873
8M102?
0ys2)mm?7633?18(A选用S
2?16
3?18
地下连续墙的稳定性分析
(1)墙体内部稳定性验算