地下水作用下含软弱夹层边坡可靠性分析  

Reliability analysis of slope with weak interlayer under groundwater action

作　　者：段志超 王菁菁 李育红 胡萱苡 关艳丽 Duan Zhichao;Wang Jingjing;Li Yuhong;Hu Xuanyi;Guan Yanli(YCIH No.1 Engineering Survey and Design Co.,Ltd.,Kunming 650500,China)

机构地区：[1]云南建投第一勘察设计有限公司,昆明650500

出　　处：《工程勘察》2024年第9期12-18,共7页Geotechnical Investigation & Surveying

摘　　要：含软弱夹层边坡在工程中普遍存在,其失稳破坏将导致严重的失事后果。受众多不确定性因素的影响,传统的确定性分析方法在评价含软弱夹层边坡稳定性能时存在较大的不足,因此迫切需要新的理论和方法解决上述问题。本文采用刚体极限平衡法研究了含软弱夹层边坡的可靠性;并对云南省某一实际工程进行了分析研究,验证了所提方法的正确性。研究表明:对比有限元极限分析上限法(UBM)、下限法(LBM),所提方法可有效计算含软弱夹层的边坡稳定性问题;随着地下水位的升高,边坡的安全系数的均值会逐渐降低,边坡的失效概率会逐渐增加,边坡的可靠指标会逐渐降低;随着地下水位的升高,边坡发生深层失效的概率将明显增大。本文所提方法具有严格的力学推导过程,可为实际工程提供有效的分析手段。The slope with weak interlayer is common used in engineering,and its instability failure will lead to serious failure problem.Due to the influence of many uncertain factors,the traditional deterministic analysis method has great shortcomings in evaluating the stability performance of slopes with weak interlayers,so new theories and methods are urgently needed to solve the above problems.In this paper,the rigid body limit equilibrium method is used to study the reliability of slope with weak interlayer,and a practical project in Yunnan Province is analyzed and studied to verify the correctness of the proposed method.The results show that:compared with the upper bound method(UBM) and the lower bound method(LBM) of finite element limit analysis,the proposed method can effectively calculate the stability of the slope with weak interlayers;With the increase of groundwater level,the average safety factor of slope will gradually decrease,the failure probability of slope will gradually increase,and the reliability index of slope will gradually decrease;With the increase of groundwater level,the probability of deep failure of slope will increase obviously.The proposed method has a strict mechanical derivation process and can provide an effective analytical means for practical engineering.

关 键 词：地下水作用 含软弱夹层边坡 可靠性 失效概率 

分 类 号：TU43[建筑科学—岩土工程]