边坡稳定安全储备的双折减系数推导

Analysis on Safety Reserve of Slope with Two Strength Reduction Factor

目前均质边坡的极限平衡条分法及有限元强度折减法分析中,c,φ均采用同一安全系数或同一折减系数.但c,φ在边坡发生滑动时发挥的作用不同、发挥作用的先后秩序不同以及衰减的速度也不同,若采用传统的同一折减系数或同一安全系数不能反映c,φ各自实际的安全储备,因此采用不同的强度折减系数(安全系数)进行定量分析,以"自承力最大值原理"为依据,得出了c,φ采用不同的折减系数更符合实际.

Currently the same safe factor or the same strength reduction factor to c and ψ is adopted in all limited balance and in strengh reduction FEM. But when the slope sliding, c andψ have different function, different order in producing result and different reduction speed. If adopted the same strength reduction factor, the actual safety reserve could not be reflected. So the authors analyzed it quantificationally in different strength reduction factor. The results indicate that two strength reduction factors are appropriate according to the ＂maximum principle＂.