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B≥2fx B≥fs fs≥B≥fx fs-fx≥B≥fx
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fx>fy fx=fy fx需要根据稳定性分类判别
fx=+0.070mfy=-0.060mΣD=495m fx=+0.080mfy=-0.060mΣD=485m fx=+0.080mfy=-0.060mΣD=495m fx=+0.080mfy=-0.070mΣD=505m
fs≥2fx fs≥fx fs≤fx fs≤2fx
∑Fx=0 Fx=0 Fy=0 ∑Fy=0 ∑Fx=∑Fy