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Abstract:The results of the early studies of the undermining problems are summarized in the initial portion of this report. Additionally, the design and use of a model sidewalk for testing procedures for preventing undermining are described. Based upon tests with the various model setups the following conclusions are made: 1. Close to maximum compaction of the subgrade soil does not prevent sidewalk undermining. 2. A No. 21-A stone compacted as a sidewalk subbase prevents sidewalk undermining, but may transfer the undermining to another location. 3. Modification of the subgrade soil by the addition of 2% agricultural grade hydrated lime prevents sidewalk undermining, while the transfer phenomenon could be prevented by modifying the strip of soil 4" from the back of the sidewalk to the edge of pavement. Through the observation and evaluation of field test sites and sidewalk undermining sites the following conclusions are made: 1. Close to maximum compaction of the subgrade soil, either with or without use of cut-off walls, does not prevent sidewalk undermining. 2. A drainage system constructed under the sidewalk has been very effective in preventing sidewalk undermining. 3. The reuse of existing sidewalk slabs is feasible for sidewalk repair.
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