en Soil Mechanics Classic Soil Mechanics Classic Research Paper Research Paper <p align="left"><img alt="AWT IMAGE" chromakey="white" src="file:///C:UsersADELJA~1AppDataLocalTempmsohtmlclip11clip_image001.png" ><em>Presented is a method of two-dimensional analysis of the active earth pressure due to simultaneous effect of both soil weight and surcharge of strip foundation. The study’s aim is to provide a rigorous solution to the problem in the framework of upper-bound theorem of limit analysis method in order to produce some design charts for calculating the lateral active earth pressure of backfill when loaded by a strip foundation. A kinematically admissible collapse mechanism consisting of several rigid blocks with translational movement is considered in which energy dissipation takes place along planar velocity discontinuities. Comparing the lateral earth forces given by the present analysis with those of other researchers, it is shown that the results of present analysis are higher (better) than other researchers’ results. It was found that with the increase in <img alt="AWT IMAGE" chromakey="white" src="file:///C:UsersADELJA~1AppDataLocalTempmsohtmlclip11clip_image001.png" >, the proportion of the strip load (q) which is transmitted to the wall decreases. Moreover, Increasing the friction between soil and wall ( <img alt="AWT IMAGE" chromakey="white" src="file:///C:UsersADELJA~1AppDataLocalTempmsohtmlclip11clip_image002.png" >) will result in the increase of effective distance ( <img alt="AWT IMAGE" chromakey="white" src="file:///C:UsersADELJA~1AppDataLocalTempmsohtmlclip11clip_image003.png" >). Finally, these results are presented in the form of dimensionless design charts relating the mechanical characteristics of the soil, strip load conditions and active earth pressure.</em></p> Retaining wall, Active lateral earth pressure, Limit analysis, Upper-bound, Strip load 281 291 http://ijce.iust.ac.ir/browse.php?a_code=A-10-186-5&slc_lang=en&sid=1 O. Farzaneh ofarzane@ut.ac.ir 1800319475328460010025 1800319475328460010025 No School of Civil Engineering, Faculty of Engineerin/g, University of Tehran, Shanzdah Azar Avenue, Enghelab Street, P.O. Box: 14155-6457, Tehran, Iran F. Askari askari@iiees.ac.ir 1800319475328460010026 1800319475328460010026 Yes University of Tehran J. Fatemi jfatemi@ut.ac.ir 1800319475328460010027 1800319475328460010027 No School of Civil Engineering, Faculty of Engineerin/g, University of Tehran, Shanzdah Azar Avenue, Enghelab Street, P.O. Box: 14155-6457, Tehran, Iran