Knowledge of the use of clay stretches back to prehistoric times, when man began building houses for habitation and roads for transportation. In more ancient civilizations, clay was used by man as a building material for the foundations of structures and for the construction itself. Knowledge of soils for foundations, embankments and roads was acquired through trial and error experiments. In ancient times and even within the last few generations, practically all improvement was the result of the continuous spread of empirical knowledge. Humans have historically used soil as a material for flood control, irrigation purposes, burial sites, building foundations, and buildings. The first activities were related to irrigation and flood control, as evidenced by evidence of dams, dams, and canals dating back at least to 2000 BC in ancient Egypt, ancient Mesopotamia, and the Fertile Crescent, as well as around the early settlements of Mohenjo. appears. Darus and Harappa in the Indus Valley. As cities expanded, structures were built, supported by formal foundations. The ancient Greeks mainly constructed pad footings and strip and raft foundations. However, until the eighteenth century, no theoretical basis for clay design had been developed and the discipline was more of an art than a science, relying on past experience.Many structures were built in the medieval period (about AD 400–1400). One of the main problems they had was about the compression of soil and the consequent settlement of buildings. During the past centuries, the compressible soil upon which heavy structures such as cathedrals were built had enough time to consolidate, causing large settlements. The Leaning Tower of Pisa is an example. In India, the Taj Mahal was constructed between 1632 and 1650. It had unique foundation problems because of its proximity to the river Jamuna. Several foundation-related engineering problems, such as for the Leaning Tower of Pisa, prompted scientists to begin taking a more scientific-based approach to examining the subsurface.
Classical geotechnical mechanics began in 1773 with Charles Coulomb’s introduction of mechanics to soil problems. Using the laws of friction and cohesion to determine the true sliding surface behind a retaining wall, Coulomb inadvertently defined failure criteria for soil. By combining Coulomb’s theory with Christian Otto Mohr’s theory of a 2-D stress state, the Mohr–Coulomb theory was developed – a very useful graphical construction still used today. A rudimentary soil classification system was also developed based on a material’s unit weight, which is no longer considered a good indication of soil type.
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