Session Start Date

6-1-1988

Abstract

Ground improvement techniques were used to meet the design requirements for a beach resort complex at Half Moon Bay on the Arabian Gulf. Extensive site exploration revealed upper layers consisting of loose to medium fine sand, having variable silt content. The original specification called for filling and ground improvement using Dynamic Compaction to achieve 100kN/m2 surface bearing capacity and 50% relative density at a depth of 10m. Dynamic Compaction (DC) and subsequent field testing, using full scale loading tests as well as CPT and SPT tests, proved that it was possible to achieve these requirements over most areas using dynamic compaction, however it was not suitable in a few other areas where ground response to DC was poor. Those areas contained silty layers and showed signs of rapid pore pressure build up under dynamic compaction, while dissipation was slow and penetration resistance remained poor. Therefore, it was decided to use pre-loading in those areas. Further testing and instrumentation showed that pre-loading was achieving the required ground improvement.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Experience in Ground Improvement by Dynamic Compaction and Preloading at Half Moon Bay – Saudi Arabia

Ground improvement techniques were used to meet the design requirements for a beach resort complex at Half Moon Bay on the Arabian Gulf. Extensive site exploration revealed upper layers consisting of loose to medium fine sand, having variable silt content. The original specification called for filling and ground improvement using Dynamic Compaction to achieve 100kN/m2 surface bearing capacity and 50% relative density at a depth of 10m. Dynamic Compaction (DC) and subsequent field testing, using full scale loading tests as well as CPT and SPT tests, proved that it was possible to achieve these requirements over most areas using dynamic compaction, however it was not suitable in a few other areas where ground response to DC was poor. Those areas contained silty layers and showed signs of rapid pore pressure build up under dynamic compaction, while dissipation was slow and penetration resistance remained poor. Therefore, it was decided to use pre-loading in those areas. Further testing and instrumentation showed that pre-loading was achieving the required ground improvement.