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Throughout the Appalachian areas of the Eastern United States, site developers face the task of constructing extensive cut and fill situations in order to obtain building sites. Along with the expense of large filling operations, oftentimes they are required by the geotechnical engineer to monitor the fills for settlements before the foundation work can begin. This monitoring period can at times extend for 18 months. A developer will incur severe financial burdens during this monitoring period. CTL Engineering has incorporated the use of a technique commonly known as “dynamic compaction” to precompress these fills such that the post — construction monitoring period is substantially reduced. Five case studies have been completed where the fills were conventionally constructed and the building pads dynamically compacted. Three of the sites were extensively instrumented to monitor settlements during and subsequent to construction. The data will show that the areas that received dynamic compaction did not differentially settle under very large cut-fill depths and comparative fills where conventional compaction techniques were used settled more than 7 inches. Settlement plates, standard penetration testing and various survey networks were used to evaluate the performance of the dynamic compacted sites. The sites have been in operation for up to five years and have not exhibited any signs of differential settlement.
dynamic compaction, differential settlement, precompression, Settlements Plates
President, CTL Engineering, Inc., Columbus, OH
President, CTL Engineering of West Virginia, Inc., Morgantown, WV