LIMIT EQUILIBRIUM COMPUTATION OF DYNAMIC PASSIVE EARTH PRESSURE

Few solution techniques exist for the determination of pseudostatic dy namic passive earth pressures for cohesionless soils. The widely accep ted Mononobe-Okabe equation can result in the computing of unconservat ive values if the wall interface friction angle is greater than half t he soil internal friction angle. As an alternate solution, equilibrium equations were formulated assuming a log spiral failure surface, and a research computer program was written to calculate the dynamic passi ve earth pressure coefficient. The primary purpose of this paper is to present a comparison of results obtained using the Mononobe-Okabe equ ation with those obtained using the log spiral formulation.