Estimation of stochastic nonlinear dynamic response of rock-fill dams with uncertain material parameters for non-stationary random seismic excitation

Abstract

This research investigates the effect of uncertain material parameters on the stochastic, dynamic response of a rock-fill dam-foundation system subjected to non-stationary random excitation. The uncertain material parameter of particular interest is the shear modulus, developed from a lognormal distribution model. The stochastic seismic response model of the dam-foundation system, with uncertain material parameters and subjected to random loads is the result of a Monte Carlo simulation method. The nonlinear behavior model arises from an equivalent linear method, which considers the nonlinear variation of soil shear modulus and soil damping as a function of shear strain. Specification of the non-stationary stochastic process arises from a simulation method, which generates artificial earthquake accelerograms obtained from the product of a deterministic function of time and a stationary process. The artificial earthquake ground acceleration records reflect the charac-K. Hacıefendioglu ( ) teristics of soft, medium and firm soil types. Comparison of the numerical results from these approaches provides stochasticity in earthquake seismic excitation and randomness in material parameter (shear modulus) cases. Further, the results indicate that both these cases generally influence the nonlinear dynamic response of rock-fill dams to a non-stationary seismic excitation.

Dynamic analysis and criterion evaluation on rockburst considering the fractured dissipative energy

“…In addition, with the fast development of computer techniques, more and more scholars use finite difference software and finite element analysis software, such as FLAC3D and ANSYS, to solve dynamic problems. [16][17][18][19][20][21][22][23][24][25][26][27][28][29] Therefore, the main idea of this article is fourfold: (1) by considering the energy mechanism of the rockburst, a calculation model of common mining area would be presented to analyze the rockburst energy including elastic strain and dissipative energy; (2) using the split-Hopkinson pressure bar (SHPB) testing system, a series of SHPB tests would be carried out, to obtain the percentage of the fractured dissipative energy occupied in total input dynamic energy; (3) meanwhile, to fit the dynamic mechanical parameters of rock specimens and dynamic impact factors (DIF) also with SHPB testing data; and (4) to predict the contours of energy and the damage conditions of host rock and estimate the tendentiousness of the rockburst by employing the numerical simulation method.…”

Uncertainty Quantification in non-linear seismic wave propagation

“…Nour et al [46] also carried out probabilistic seismic response analysis using Monte Carlo simulations with deterministic FEM solver -FLUSH [47]. Hacefendiolu et al [48] investigated the effect of lognormally distributed shear modulus on the dynamic response of a dam foundation system subjected to non-stationary random excitation, using the Monte Carlo method. For an elastic domain, the study was based on an equivalent linear method.…”