Effect of Granular Material on the Rate of Consolidation of Peat Soil

 

Zulkifli Abu Hassan

Department of Civil Engineering National Defence University of Malaysia zulabha@upnm.edu.my

Mohd Nazrin Mohd Daud

Department of Civil Engineering
National Defence University of Malaysia

Muhamad Azani Yahya

Department of Civil Engineering National Defence University of Malaysia

Muhamad Azani Yahya

Department of Civil Engineering National Defence University of Malaysia

Mohammad Shahir Shaharuddin

Department of Civil Engineering National Defence University of Malaysia

 

 ABSTRACT

Construction works on peat lands are always difficult; many incidences of buildings and infrastructures subsidence after construction works completed have been reported. These problems are common on areas overlain with peat soils. Efforts in solving these problems involve methods that have been widely practice such as mixing or treating the problematic soils with other materials with the intention to improve the strength and stiffness of the soil. In many cases cement or cement combination with different by-products from industrial processes are often used as chemical stabilizers to improve geotechnical properties of peat soil through mixing process. This study however, investigated the effect of different percentages of sand on peat soil with respect to their rate of consolidation and compression ratios. The attempt is to address the effectiveness in using granular material as a stabilizer such as sand that does not constitute pozzolanic reactions in stabilizing peat soil. It was found that the coefficient of consolidation (Cv) of soil specimens with addition of sand are higher compared to the untreated peat and specimen with 50% sand reduced about 70% in settlement compared to untreated specimen. The time taken for the soil to consolidate also decreased as sand content increases where the rate of consolidation increased when the sand content increases. While Compression index (Cc) value, that signifies the compressibility of a soil was also reduced to 90% in specimen with 50% sand content.

Keywords: Granular material, peat soil, oedometer, compression coefficient, rate of consolidation, compression index

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