System Reliability Research Of The Overall Stability Of Gravity Dam Foundation

Gravity dam is one of the most common type of the dams,while rock foundation instability is one of the major failure modes for gravity dams.The overall stability analysis of the rock foundation of gravity dam has become an important subject in the field of hydraulic engineering.At present,in the stability analysis of the rock base,the safety of the whole gravity dam is determined by selecting the safety index of the typical single slip path,but deep sliding channels are usually made up of multiple slides and there might be more than one slide,these sliding surfaces and sliding channels form a structural system,therefore,it is more reasonable to analyze the safety degree by using the theory of structural rest reliability.At present,in the field of stability analysis of gravity dam.There is little research in this area.In order to obtain more realistic safety indicators,based on the research results of reliability,the advantages and disadvantages of the reliability analysis method based on the reliability analysis of different systems are analyzed.The corresponding procedures is compiled,the a stability reliability of double inclined plane of gravity dam are calculated and analyzed,in order to providing reference the reliability analysis of the whole system of gravity dam.The main work is as follows:Firstly,the random variables that influence the reliability of gravity rock are analyzed.Considering the normal distribution of shear friction coefficient,the log normal distribution of cohesion,according to the theory of reliability,several function functions of slip path are established respectively,the reliability index of each failure mode is calculated by using the reliability analysis Monte Carlo method.Secondly,considering no correlation between shear friction coefficient and cohesion,the correlation coefficient between the failure modes was calculated by the general correlation coefficient method and Pearson correlation coefficient method respectively.Considering the correlation between shear friction coefficient and cohesion,the correlation coefficient between the failure modes was calculated by Pearson correlation coefficient methodThirdly,considering several failure paths as a number of units that make up a series system.The system reliability and PNET method are used to analyze the reliability of the system,the results of which are compared with the Monte Carlo method.Through examples and engineering examples of gravity dam rock stability analysis.Calculation method of correlation coefficient between failure modes and the method of system reliability index calculation method are analyzed and evaluated.Some useful conclusions are obtained for the further study of the stability analysis of gravity dam.