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以大岗山坝肩边坡为算例,对不同岩层的变形模量、黏聚力和内摩擦角进行整体和局部折减计算其安全系数,得出不同参数在不同位置下对特定边坡稳定性的贡献率。该贡献率量化处理后应用到评价系统中,定量标定了不同岩层参数的权重分配,确定坡体综合力学参数的隶属度。根据规范要求,以安全系数1.30,1.175和1.05为界,通过线性回归分析有针对性的给出具体工程不同参数分级标准;确定不同岩层内参数所在稳定级别基础上,结合所占分析区域的面积比值,采用不同岩层的安全系数综合贡献率进行修正得出不同参数的隶属度矩阵。该方法对综合评价体系中部分模糊的成分进行了基于有限元计算的精确化处理,在权重分配、隶属度确定、分级标准确定及坡体综合力学参数确定等4个评判主要环节上以消弱主观因素带来的不确定性影响,与经验法相比工程针对性更强,结果得出更科学合理。
Taking the Dagangshan dam shoulder slope as an example, the deformation factor, cohesion force and internal friction angle of different strata are calculated by global and partial reduction to calculate the safety factor. The contribution rate of stability. The contribution rate is quantified and applied to the evaluation system, the weight distribution of different rock parameters is quantitatively calibrated, and the membership degree of the comprehensive mechanics parameters of the slope is determined. According to the requirements of the code, the safety factors of 1.30, 1.175 and 1.05 are used as a boundary, and the classification criteria for different parameters of a specific project are given through linear regression analysis. Based on the stability level of the parameters in different strata and the area of the analyzed area Ratio, using the comprehensive contribution rate of the safety factor of different strata to be amended to obtain membership parameters of different parameters matrix. In the method, some fuzzy components of the comprehensive evaluation system were processed by finite element method. The method was weakened in four main evaluation stages, including weight distribution, membership degree determination, grading standard determination and slope comprehensive mechanical parameter determination Subjective factors brought about the impact of uncertainty, compared with the experience-based projects more targeted, the results obtained more scientific and rational.