Site investigation is widely used for uncertainty reduction and design improvement in slope engineering. Before the site investigation is implemented, it is important to assess and compare the effectiveness of different site investigation programs. In this paper, an efficient method for analyzing the effectiveness of a site investigation program for slope stability assessment through value of information analysis is proposed. In this method, a logistic regression model is developed to approximate the relationship between failure probability of the slope and the site investigation data, through which the evaluation of posterior distribution and slope reliability analyses are both avoided. The suggested method is illustrated and verified with an example. For the example studied in this paper, the number of slope stability analyses required is only 1% of that reported in the literature. The suggested method can be used to study the effects of locations of the boreholes, the number of boreholes, and the depth of boreholes on the effectiveness of a site investigation program.

现场调查广泛用于减少不确定性和改善边坡工程中的设计。在实施现场调查之前，重要的是评估和比较不同现场调查程序的有效性。本文提出了一种有效的方法，可以通过信息分析的价值来分析现场调查计划对边坡稳定性评估的有效性。在该方法中，建立了逻辑回归模型以近似估计边坡的破坏概率与现场调查数据之间的关系，从而避免了后验分布的评估和边坡可靠度分析。举例说明并验证了建议的方法。对于本文研究的示例，所需的边坡稳定性分析次数仅为文献报道次数的1％。所建议的方法可用于研究钻孔位置，钻孔数量和钻孔深度对现场调查程序有效性的影响。