In this paper, the effect of geotechnical site investigation attempts is investigated in a horizontal plane of stochastic cohesive-frictional soils for slope reliability evaluations. To this end, the influence of the horizontal scale of fluctuation (SOF_h), assuming a constant vertical scale of fluctuation (SOF_v = 1 m), on probabilistic slope stability analyses is evaluated using Monte Carlo simulation technique combining with a new dependable spatially and cross-correlated (between cohesion and friction) non-stationary random field algorithm. Furthermore, the importance of the number of boreholes in the horizontal plane of horizontally heterogeneous sites has been investigated to evaluate slope stability factor of safety (FS). The results have shown that more boreholes in the horizontal plane of horizontally heterogeneous sites return low risky slope stability evaluations. In the worst case of this study (i.e., the highest horizontal spatial inherent soil variability and the least number of investigating boreholes), the FS value of slope stability is computed about six percent more than the most realistic factor of safety, that is risky.

在本文中，岩土工程现场调查的效果在随机黏性摩擦土的水平面中进行了研究，以评估边坡的可靠性。为此，假设水平方向的垂直尺度波动（SOF _v）恒定，则水平方向的尺度波动（SOF _h）的影响 = 1 m），使用蒙特卡洛模拟技术结合新的可靠的空间和互相关（内聚和摩擦之间）非平稳随机场算法，对概率边坡稳定性进行了评估。此外，已经研究了水平非均质场地水平面上的钻孔数量的重要性，以评估安全性边坡稳定系数（FS）。结果表明，水平非均质场地水平面中的更多钻孔返回低风险的边坡稳定性评估。在本研究的最坏情况下（即，水平空间固有土壤最大变异性和所研究钻孔的数量最少），计算出的边坡稳定性的FS值比最现实的安全系数高大约6％，这是有风险的。