Soft ground improvement by using geotextiles

Tan, Guo Xin (2010) Soft ground improvement by using geotextiles. [Final Year Project Report / IMRAD] (Unpublished)

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Abstract

Many construction projects which are built on soft ground will prone to failure. This is because the bearing capacity of soft soil foundation materials is fail to sustain the construction's load and the deformation under load is large. Hence, an effective method towards these problems should be carried out so that the settlement problem can be solved in future. Geotextiles have multifunction once it contact with water, soil or stone and it can apply in various civil engineering fields and reduce construction time and money. Besides that, the installation of Geotextiles is easy to learn. It is important to improve the soft soil strength by using Geotextiles. This research presents the improvement of soft soil by using PEC200 Geotextiles. This research has compared between two soil samples. The weaker soil is chosen because it has the higher compressive strength. The chosen weak soil is clay with high plasticity soil (CH) and this sample is further tested the compressive strength which is standard Proctor test. The result from the laboratory experiment work shows that the maximum dry density and optimum moisture content for CH soil sample are 1. 73 Mg/m" and 31.8% respectively. The unconfined compression strength for CH soil sample is 55kPa and hence the cohesion of the sample is 27.5 kPa. In Triaxial Compression Test, the shear stress for sample without Geotextile is 29.25kPa. The sample with one layer Geotextile at the middle is 58.29kPa. Meanwhile, the shear stress for sample with two layer Geotextiles is 98.45 kPa. Hence, it is proven that Geotextile can further improve the soft soil properties.

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