Safety criteria for slope stability of high rockfill dams based on the generalized reliability ratio of safety margin
The slope stability of rockfill dam is important to the safety of dam.Current codes specify that the slope stability of high dams with the height above 200 m should be studied as special cases.Safety factor is used as the safety criterion of rockfill dam slope stability in current dam design codes.It is difficult to reasonably consider the influence of uncertain factors such as strength parameters of rockfill materials,and it is urgent to develop the corresponding reliability-based design(RBD)method.Target reliability is used as the safety criterion in RBD.Therefore,the study of target reliability of high rockfill dams is an important prerequisite for the development of RBD.Generalized reliability ratio of safety margin(RRSM)provides a useful tool to bridge design criteria of deterministic design method and reliability-based design.In this paper,the generalized RRSM is applied to the safety criterion of slope stability of over 200 m high rockfill dam to verify the equivalence of safety criterion between deterministic design and RBD of high rockfill dam,and the target reliability levels of slope stability of hard and soft rock rockfill dams are studied,respectively.Results show that the target reliability of hard rock rockfill dam specified in the"Unified Standard of for Reliability Design of Hydraulic Engineering Structures"(SL 50199-2013)meets the requirements of the calibrated target reliability level,but it is suggested to use a higher target reliability level of soft rock rockfill dam.
generalized reliability ratio of safety marginreliability-based designsafety criteriahigh rockfill damslope stability
万方数据
维普
