Instructor: Robert Holtz
The design and construction of embankments on very soft foundations is one of most challenging geotechnical problems. Without some type of foundation soil improvement, failures are common especially on very soft sites. Soil reinforcement with geosynthetics is often the only economical solution, and some projects cannot be constructed without geosynthetics. The lecture begins with a brief overview of conventional treatments for soft ground construction. Some early case histories, mostly failures, are described that provided valuable lessons and concepts that we use today for design and construction. Analysis and design procedures are then outlined, along with the selection of the required properties for the geosynthetics and embankment soils. Sample specifications, cost considerations, as well as inspection and instrumentation are also described. Because proper construction is so critically important for success of these projects, a detailed discussion of construction procedures completes the course. Detailed lecture notes and copies of the course slides will be provided. Course outline: A. Soft foundations and conventional solutions B. Case histories and lessons learned C. Design steps and procedures D. Soil and geosynthetics properties E. Specifications, inspection, and cost considerations F. Construction Participants will be able to identify soft ground projects where geosynthetic reinforcement is feasible, understand design procedures and required soil and geosynthetic properties, and appreciate the critical importance of proper construction procedures.