基于JC法的重力坝深层抗滑稳定研究
JC method based deep anti-sliding stability of gravity dam

【目的】研究重力坝深层抗滑稳定特性，为确保大坝施工期、运行期抗滑稳定安全提供参考。【方法】基于JC法建立了重力坝深层抗滑稳定可靠度分析模型，以刚体极限平衡法构造了重力坝双斜滑动面深层抗滑稳定极限状态函数，以滑裂面抗剪断摩擦系数和抗剪断凝聚力为随机变量，分析重力坝双斜滑动面深层抗滑稳定安全度。编制基于JC法的重力坝深层抗滑稳定可靠度计算程序，对某水利枢纽工程非溢流坝段正常蓄水位情况下的危险断面进行分析。【结果】对某水利工程非溢流坝段在正常蓄水位下危险断面的分析表明，采用JC法可靠度计算程序计算得到其双斜面深层抗滑稳定的可靠度指标β=4.36，其失效概率Pf=0；而采用传统的刚体极限平衡法计算得到其双斜面深层抗滑稳定的安全系数K=3.23，满足重力坝深层抗滑稳定基本组合工况下K>3.0的要求。2种方法计算结果均表明，该坝段的深层抗滑稳定满足要求。【结论】采用JC法可以运用可靠度理论实现重力坝深层抗滑稳定的计算与分析。
【Objective】This paper studied the deep anti-sliding stability of gravity dam to ensure the anti sliding safety of gravity dam during construction and operation period.【Method】A reliable analysis model for deep anti-sliding stability of gravity dam was established based on JC method,and the limit state function of deep anti-sliding stability of gravity dam was constructed by using rigid body limit equilibrium method.Deep anti-sliding stability safety degree of gravity dam was calculated with the random variables including sliding plane anti-shear friction coefficient and anti-shear cohesion.In addition,calculation program of gravity dam deep anti-sliding stability based on JC method was compiled and a non-overflow gravity dam section under normal pool level was calculated.【Result】Deep anti-sliding stability of a hydro project of non-overflow gravity dam section was analyzed under normal water level.The reliability index β of deep anti-sliding stability using compiled program was 4.36,and failure probability Pf was zero.The safety factor K calculated using limit rigid body method was 3.23,which met the basic requirement of K>3.0.The results of both methods showed that deep anti-sliding stability of the dam section met the requirement.【Conclusion】Deep anti-sliding stability of gravity dam can be achieved by JC method