Dynamic Reliability Analysis Of Retaining Wall With Random Parameter Subjected To Seismic Activity

The gravity retaining wall supporting has been widely used in slope and excavation support in our country, and the gravity retaining wall supporting shows a greater superiority and adaptability. However, the gravity retaining wall supporting use of dynamic design analysis method to be static, without consideration of soil, retaining walls and the dynamic load of physical and mechanical indexes of randomness,then that lead to some retaining wall estimate by pseudo-static method, the safety factor is adequate, but the gravity retaining wall was put into use and the damage occurred quickly. If you introduce the parameters of random dynamic reliability analysis method to the design of retaining walls supporting, you can reduce the occurrence of damage. A dynamic reliability method inducts into the retaining wall designing and calculation of supporting.At home and abroad, some scholars have been done some work, this article makes a study to base on the previous work,as follow:(1)This text analyze the impact of the dynamic reliability of retaining wall with random variables, that conside the soil angle of internal friction, heavy, cohesive force, the elastic modulus, Poisson's ratio normally distributed fliers random variable; According to dynamic reliability theory, and establishment of a function function, and use design point method in the first order second moment theory to calculate the reliability index failure mode.(2) The retaining walls and soil structure interaction under earthquake relations are very complex,performance function was so difficult to established, so in this text, the widely used response surface method was used to establish the implicit performance function of the soil and retaining wall structure, then fit an explicit performance function.(3)Using the least square method to get the regression coefficients in the performance function, and then get the limit state equation of the structure.(4) Using the software matlab to programming, the structure reliability index was obtained through the iterative finally.(5)Through specific examples, calculated the structure under earthquake dynamic reliability index, and then get the reliability index evolution of all the nodes along the wall altitude variation, and provides a reference design for the project.