Discussion of “Analysis of passive earth pressure modification due to seepage flow effects”

The paper by Hu et al. (2018) attempted to quantify the potential impact of seepage flow in the cohesionless backfill on the development of passive earth pressure behind vertical retaining wall. The writer likes to show his gratitude to authors for presenting such interesting results in this paper which would be very much useful for the practicing geotechnical community. While reading this paper with great interest, the writer has left with certain doubts on the methodology and basic assumptions on which the entire analysis has been carried out.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author