--- title: "Historical development of soil mechanics" subject: "Soil Mechanics" chapter: 1 key: "semester_4/soil_mechanics:historical-development-soil-mechanics" source: https://www.bctengineer.com/q/semester_4/soil_mechanics/historical-development-soil-mechanics site: BCT Engineering --- # Historical development of soil mechanics Soil Mechanics · Chapter 1: Introduction - Asked in: 2076 Baisakh, 2 marks - Video: [The History of Geotechnical Engineering.](https://www.youtube.com/watch?v=Qs2pOGPOorY) — GeoTechs With Clemency - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_4/soil_mechanics/historical-development-soil-mechanics - Whole chapter: https://www.bctengineer.com/md/semester_4/soil_mechanics/chapter-1 ## Question Briefly describe the historical development of soil mechanics. ## Short answer Soil mechanics evolved from ancient empirical construction to a science in the 18th century. Coulomb (1773) introduced earth pressure theory and shear strength equation, Darcy (1856) formulated flow law, and Rankine (1857) extended earth pressure theory. Karl Terzaghi (1925) established modern soil mechanics as the father of the discipline by publishing Erdbaumechanik, and developing effective stress and consolidation theory. ## Answer Soil has been used since ancient times for foundations, dams and roads, but a scientific approach began only in the 18th century. - **Ancient period:** Egyptian, Indian, Chinese and Roman engineers built dams, canals, temples and roads using experience only, with no theory. - **1773 - Coulomb:** gave the theory of earth pressure on retaining walls and the shear strength equation $\tau = c + \sigma\tan\phi$. - **1856 - Darcy:** law of flow of water through sand, $v = ki$. - **1857 - Rankine:** earth pressure theory for cohesionless soil. - **1911 - Atterberg:** consistency limits (liquid, plastic and shrinkage limits). - **1916 - Petterson (Sweden):** slip circle method for slope stability, later developed by Fellenius into the method of slices (1927 onwards). - **1925 - Karl Terzaghi:** published *Erdbaumechanik*, the first book on the subject, and developed the principle of effective stress and the theory of consolidation. He is called the **Father of Soil Mechanics**. - **1933 - Proctor:** standard compaction test (moisture-density relationship). - **Later:** Casagrande (soil classification, plasticity chart), Skempton (pore pressure parameters), Meyerhof and Hansen (bearing capacity), Bishop and Peck all contributed. The International Society of Soil Mechanics and Foundation Engineering was formed in 1936. Today the field also includes computer modelling and ground improvement methods. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Who is called the Father of Soil Mechanics and why? A. Terzaghi, who published Erdbaumechanik (1925) and developed effective stress and consolidation theory B. Coulomb, for Darcy's law C. Rankine, for the plasticity chart D. Proctor, for slip circle Answer: A. Karl Terzaghi's 1925 book and effective stress/consolidation theory founded the subject. (Key point: Father of soil mechanics) 2. Coulomb (1773) contributed: A. Compaction test B. Atterberg limits C. Earth pressure theory on retaining walls and tau = c + sigma tan(phi) D. Flow nets Answer: C. Coulomb gave earth pressure theory and the shear strength equation. (Key point: Coulomb) 3. Darcy (1856) gave the law of: A. Flow of water through sand, v = ki B. Earth pressure C. Consolidation D. Bearing capacity Answer: A. Darcy's law describes flow through soil. (Key point: Darcy) 4. Atterberg's contribution was: A. Slip circle method B. Compaction test C. Consistency limits (liquid, plastic, shrinkage) D. Bearing capacity equation Answer: C. Atterberg defined the consistency limits in the 1900s. 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