【摘要】 为了进一步提升基于强度折减法和FLAC 3D数值计算的效率,对现有二维与三维数值分析模型建立中存在的问题进行讨论,结果表明,二维模型仅边界尺寸不相同时,材料参数的变化不会影响不同边界尺寸模型间分析结果差异的大小,当划分的网格单元尺寸小于等于坡高H的0.1倍时,分析结果较理想。同时,提出了一种二维模型最佳边界尺寸确定方法,即:先按L/H=1.5、R/H=2.5、B/H=2建立分析模型,根据计算所得塑性区分布情况,对模型尺寸进行调整,对比分析调整前后安全系数及塑性区分布情况,根据分析结果决定继续对模型进行调整或确定最佳的数值分析模型尺寸。还提出一种三维模型侧边界弹性约束方法,可以实现侧边界条件不对称情况的三维数值分析。更多还原

【Abstract】 In order to further improve the efficiency of numerical calculation based on strength reduction method and FLAC 3 D, the existing problems in the establishment of 2 D and 3 D numerical analysis models are discussed, and an improved method is proposed. The results showed that: The change of the analysis parameters wouldn′t affect the difference of the analysis results of numerical model with different boundary size when the boundary size was the only discrepancy between 2 D models. Fitting results could be got when the size of the analysis elements was no more than 0.1 times of the height of slope. A new method was proposed about how to determine the fitting size of 2 D numerical model. The initial analysis model was established with the size of L/H=1.5, R/H=2.5, B/H=2, the model sizes were adjusted based on the distribution of the plastic zones. The safety factor and the distribution of the plastic zones were analyzed contrastively between the initial model and the adjusted model. The decision was made about making further adjustment or determining the fitting size of the numerical model based on the contrastive analysis results. An elastic constraints method of lateral boundaries of 3 D model was proposed, which can realize the 3 D numerical analysis with asymmetric condition of the lateral boundaries.更多还原