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在不考虑岩土体的不确定性因素和不区分不同的计算方法差异的前提下,现行规范主要根据工程等级和计算工况来确定边坡安全系数致使取值偏于保守。以猴子石滑坡为例,应用可靠度分析理论,利用MATLAB软件编制了基于传递系数法、改进的传递系数法、美国陆军工程师团法、罗厄法和简化简布法的蒙特卡洛法程序,研究了不同方法可靠度指标与安全系数之间的关系,探讨了在同一可靠度(失效概率)条件下,不同方法安全系数取值的差别。结果表明,相同方法在c、φ值的变异系数不同时、不同方法在c、φ值的变异系数相同时,边坡的安全系数取值均有差异。
On the premise of not considering the uncertain factors of rock and soil and not differentiating the differences of different calculation methods, the current code mainly determines the slope safety coefficient according to the engineering grade and calculation conditions, so that the value is conservative. Taking monkey stone landslide as an example, Monte Carlo method procedure based on transfer coefficient method, improved transfer coefficient method, the US Army Corps of Engineers Corps, Roehart Law and Simplification of cloth method were compiled by using the reliability analysis theory and MATLAB software. The relationship between reliability index and safety factor of different methods is studied. The difference of safety factor between different methods under the same reliability (failure probability) is discussed. The results show that when the coefficient of variation of c and φ is different and the coefficients of variation of c and φ are the same for different methods, the values of safety coefficient of slope are different for the same method.