iqbal 1 Questions 0 Answers 0 Best Answers 22 Points View Profile2 iqbal Beginner Asked: May 7, 2019In: Geotechnical EngineeringWhy A partially saturated soil is 3 phase soil2I have confusion about partially saturated soil .geotechnicalsoil ShareFacebook1 AnswerRecentVotedOldestRipon Chandra Malo Studies M.Sc In Geotechnical Engg at BUET 0 Questions 2 Answers 1 Best Answers 20037 Points View Profile Ripon Chandra Malo Geotechnical Engineer & Moderator Studies M.Sc In Geotechnical Engg at BUET Added an answer on July 28, 2019 at 7:32 am This answer was edited. when a soil mass consist of solid particles + Water+Air then its called three phase system . Image source : https://nptel.ac.in/courses/105103097/4 Look at the saturated phase diagram from above picture .Its contain only water and solid particles with no air .So its two phase system Now ,look at again in dry soil diagram ,you can see the dry soil contains only Air +solid particles with no Water .Its also two phase system . But if we look at Partially saturated soil diagram then we can clearly see that it contains water+solid +some air because its not fully saturated . Fully saturated mean no air . So Partially saturated soil is three phase system. still ,If you have any confusion then please see the below diagram also . Image source : https://www.slideshare.net/SARASWATIPATHARIYA/index-property-of-soil0Reply Share ShareShare on FacebookShare on TwitterShare on LinkedInShare on WhatsAppLeave an answerLeave an answerCancel replySave my name, email, and website in this browser for the next time I comment.