A parking lot between two businesses was damaged by slope instability. Based on available coal mining records, the project site was not undermined but there was a possibility that these areas subjacent to the site could have been mined-out.
The cost for a grouting project is controlled by the acceptable risk the owner is willing to take. A smart stabilization program can be tailored to address only the necessary mine support issue(s) while still adequately protecting the proposed structure.
In the future, exposure of pipelines to subsidence is expected to be more commonplace. The most cost effective solution to handling related pipe stress considers the specific site conditions and applies the appropriate mitigation measures, if needed.
This Engineering UPDATE was published on the importance of improving the awareness of the presence of earthquake potential in the Midwest. The article was inspired by a recently conducted field inspection by MEA staff, along with the St. Louis Chapter of the Association of Environmental & Engineering Geologists.