دانلود کتاب پیشرفت در مهندسی روانسازی خاک

The studies on the mechanical properties of cohesive soils were advanced since 1930s, starting from the early period of growth in soil mechanics. The development in this area was instigated mainly from the needs to clarify causes of failures or unacceptably large deformations of earthworks and foundations of structures and to take into account these deleterious effects duly in the design. It is noticed that the distress in these early days was caused mainly in the soil deposits consisting of soft clay and silt, and associated with the phenomena taking place slowly in static loading conditions. In the later period after 1960s, in parallel to sprawling of urban districtsworldwide, towards low-lying areas near waterfronts, there arose another kind of natural distress. That is the softening of sandy soil deposits that could occur under dynamic loading conditions during earthquakes. Thus, soil liquefaction has become an important issue for investigation to come up with proper design considerations for earthworks and foundations of structures.