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Arresting Settlement of Peaty Soil in Built-Up Area


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DOI: https://doi.org/10.15866/irece.v5i5.3224

Abstract


In Singapore, ground settlement is one of the major problems encountered in built-up area in housing, private and industrial estates. While the structure is not affected by the settlement as they are supported by piles. Some amount of settlement may occur on the ground surrounding the structures, thus affecting the service road, car park area and other underground services. This ground settlement, mainly secondary consolidation settlement will continue for long time due to presence of thick layer of soft peaty soil. Conventional ground improvement methods may not be suitable in solving such problem especially in built-up area. Hence, in present research, a new method called Liquefied Soil-cement Mix (LSM) method is developed to treat peaty soil and thus arrest the ground settlement in built-up area. This method involves injecting cement-clay slurry into peaty soil mass to fill the voids and fissures of peaty soil. The appropriate injection pressure is carefully designed to minimize ground disturbance during and after LSM treatment. In this study, a field trial was executed to treat the peaty soil at depth of 7 to 10 m by using this method. The field trial and laboratory tests were conducted to evaluate the efficiency of LSM method. The test results indicated that settlement was significantly reduced with LSM treatment.
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Keywords


Ground Settlement; Injection Pressure; Liquefied Soil-Cement Mix (LSM); Peaty Soil

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References


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