INSTRUCTOR: Michael J. Byle, P.E., D.GE., F.ASCE

Purpose and Background

Carbonate and evaporite geologic formations underlie a large portion of the world. These formations contain soluble compounds that result in portions of the formations dissolving over time to produce cavities, conduits, enlarged joints, caves, etc. The landforms resulting from these features are referred to as karst. One of the many geotechnical concerns in karst is the occurrence of sinkholes. Repair techniques range from simple backfilling, to complex systems of filters and grouting, each of which has its own issues and impacts.

Sinkhole repair in karst pose safety hazards to individuals, utilities, and structures. Each site poses unique challenges due to the nature and distribution of karst features in the subsurface. This webinar includes a brief introduction to karst and the implications for geotechnical investigation and mitigation design. It discusses methods and strategies and provides examples for mitigating sinkholes.

This webinar presents a number of different approaches to mitigation, including, use of fill, grout, concrete, aggregate, and geosynthetics. It also presents factors for selecting appropriate measures relative to permanence, structural requirements, environmental impacts, and cost.  This webinar discusses measures to optimize the benefit and minimize the potential for a performance failure and cost overruns.

Primary Discussion Topics

• Geotechnical issues in karst
• Sinkhole Mechanisms
• Environmental and hydrologic impact of sinkholes
• Applications and limitations of various methods for sinkhole repair in karst

Learning Outcomes

• Develop an understanding of the mechanisms of repair methods
• Learn the key factors necessary for permanent sinkhole repairs in karst
• Understand the long-term versus short-term issues for mitigation performance in karst
• Develop an understanding of hydrologic and environmental impacts of sinkhole repair

Webinar Benefits

• Consider new solutions for age old problems associated with karst
• Learn effective approaches to select appropriate means for mitigating karst sinkholes
• Avoid costly errors that ensue from use of inappropriate repair methods
• Reduce or eliminate sinkhole recurrence through appropriate sinkhole mitigation strategies
• Examine the latest technology to effectively repair sinkholes

Webinar Outline

• Introduction to karst
• Geotechnical Issues in karst
• Hydrologic and environmental Issues in karst
• Sinkhole mechanics
• Mitigation methods for karst sinkholes
• Investigation needs
• Example cases

Intended Audience

• Geotechnical engineering consultants
• Geotechnical contractors
• Site development professionals
• Engineering geologists
• Structural engineers
• Civil engineers