斜土钉支护边坡三维极限承载力及可靠度分析

Analysis on Three-dimensional Ultimate Bearing Capacity and Reliability of Inclined Soil Nail-supported Slope

摘要:

现有文献尚未有对斜土钉支护边坡三维极限承载力及考虑岩土强度参数随机性的斜土钉支护边坡可靠度的研究。在此背景下，首先以极限分析上限法为框架，借助粒子群优化算法，确定了斜土钉支护边坡坡顶三维极限承载力及相应失稳面，开展了斜土钉支护边坡三维稳定性的评估；然后将所得结果与数值模拟结果进行对比，验证了所提出模型的有效性；最后借助某边坡现场测量和地质勘探资料的统计结果，构建了斜土钉支护边坡的可靠度分析模型，获得了该边坡可靠度指标和失稳概率。研究结果表明，该边坡工程满足设计要求。

Abstract:

The existing literature has not yet conducted research on the three-dimensional ultimate bearing capacity of inclined soil nail-supported slopes and the reliability of inclined soil nail-supported slopes considering the randomness of geotechnical strength parameters. Under this background, firstly, taking the upper limit method of limit analysis as the framework and leveraging the particle swarm optimization algorithm, the three-dimensional ultimate bearing capacity at the top of inclined soil nail-supported slope and corresponding instability surfaces are determined to evaluate the three-dimensional stability of inclined soil nail-supported slopes, and then the obtained results are compared with the results of numerical simulation to verify the effectiveness of the proposed models. Finally, with the help of statistical results of on-site measurements and geological exploration data of a slope, a reliability analysis model of inclined soil nail-supported slope is constructed to obtain the reliability index and the instability probability of the slope. The study result shows that the slope engineering satisfies the design requirements.