武都水库坝基深层抗滑稳定性评价中BD角的合理取值

针对武都水库大坝坝基深层抗滑稳定性分析过程中BD角合理取值问题,应用多种严格极限平衡法和极限分析法对该坝基深层抗滑稳定性评价中的BD角取值进行了分析论证,研究BD角在各种工况下变化趋势与合理取值。结果表明:BD角不等于0°,不考虑BD角会低估坝基的抗滑能力;潜在滑面稳定性较好时,BD角较小,潜在滑面稳定性较差时,BD角较大;对于武都水库大坝坝基加固工程及类似工程,采用规范中双滑面等安全系数法计算时,BD角取15°是合适的且留有安全裕度。武都水库大坝坝基加固工程的BD角取为15°,节约了大量加固费用。

Reasonable value of BD angle in deep dam foundation stability analysis of Wudu Reservoir

Based on the problem of reasonable BD angle values in the analysis of foundation stability of the Wudu Reservoir Dam,several limit equilibrium methods and limit analysis methods were applied in this study to estimate the proper value of its BD angle and to investigate the reasonable values as well as the changing trend under different working conditions.The results indicate that:(1) the anti-slide stability of the dam foundation will be underestimated if the BD angle value is assumed to be zero;(2) the better the stability of the potential sliding is,the BD angle value is smaller;and(3) 15° is a reasonable value for the BD angle for the dam foundation reinforcement projects in which the geological condition is similar to the Wudu Reservoir project.A large amount of the reinforcement expenditure is saved by considering the BD angle value to be 15° in the Wudu Reservoir Project.