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采用强度折减法对两个高度分别为60 m和40 m的土工格栅加筋高边坡的设计断面进行稳定分析,综合考虑塑性区贯通、特征点位移突变、计算不收敛,以及土工格栅的容许抗拉强度等确定相应的安全系数。计算表明采用不同的破坏标准,强度折减法会得到不同的安全系数;如果筋材强度始终得到保证,单纯由土材料的强度损失诱发边坡失稳,这种情况对应的安全系数是比较高的。考虑筋材强度,边坡会在较小的折减系数下因为筋材强度不足而失稳。有限元法能够得到不同情况下各层筋材的受力情况,可以据此进行加筋力的分配,这是极限平衡法所不具备的。
The strength reduction method is applied to the stability analysis of two design sections of geogrid reinforced high slopes with two heights of 60 m and 40 m respectively. Considering the plastic zone penetration, the displacement of characteristic points, the calculation does not converge, and the geogrid The allowable tensile strength to determine the appropriate safety factor. The calculation shows that different failure criteria are adopted and the strength reduction method can obtain different safety factors. If the strength of tendons is always guaranteed, the slope instability will be induced by the strength loss of soil materials alone. In this case, the corresponding safety factor is relatively high . Considering the strength of the tendons, the slope will not be stable due to insufficient strength of the tendons under a small reduction factor. Finite element method can get the force of different layers of tendons under different conditions, which can be based on the distribution of stiffened force, which is the limit equilibrium method does not have.