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Ground Improvement Guidelines

John Huang, Ph.D., PE and John Poullain, PE

This three hour online course discusses guidelines and criteria for improving and modifying ground conditions by various methods including deep dynamic compaction, vibrocompaction, stone columns, gravel drains and prefabricated drains. These methods are used to modify soil properties in order to improve performance for slope stability, bearing capacity, excavations in restricted spaces, increase resistance to liquefaction, differential settlement, rate of consolidation settlement as well as reduce settlement. They are used to stabilize sub-grade soils ranging from expansive clays to granular materials. A wide selection of processes and materials are available for the engineer. The course will describe their suitability for ground problems and degree of improvement attainable for different soils. Grouting and grout injection methods are not covered in this course.

The primary uses for modifying ground formations are to: a) increase the strength and bearing capacity or the soil stability, b) reduce seepage and control groundwater during construction, c) form groundwater barriers and d) rehabilitate or reinforce structures. This course should serve as a guide for determining the method to use for improving a subgrade soil in order to protect against settlement, liquefaction, and ground movement. The advantages and limitations of the methods commonly used are discussed along with methods of application.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.