Abstract
The soil plays an important role in a construction site. One type is the soft clay soil that has a value compressibility and high water levels so low soil shear strength that reduce the bearing capacity of the soil. In this study conducted by the method of soil improvement, soil stabilization using a mixture of urea fertilizer with percentage of 5 %, 10 %, and 15 % with a treatment period of 3 , 7, and 14 days with Triaxial test. Soft clay soil samples taken in the area around UNSRI, Inderalaya, OI, South Sumatra. The test results of soil properties, w 35.20 %; 2.53 Gs; PL 21.14 %; LL 42 % and IP 20.86 %. According to the USCS, the soil categorized CL, while according to AASHTO, the soil is categorized class A-7-6. Results of Triaxial testing , the value of cohesion (c) 5 % maximum on the addition of urea fertilizer (14 days) is 1.138 kg /cm 2 . While the value of shear angle (f) and shear strength (τ) maximum on the addition of 15 % urea fertilizer (3 days) of 26,42 o and 3.93 kg /cm 2 . Key Words : Urea Fertilizer, Shear Strength, Triaxial, Soft Clay
Highlights
Seperti yang diketahui, tanah berperan penting pada suatu lokasi pekerjaan konstruksi sipil
In this study conducted by the method of soil improvement, soil stabilization using a mixture of urea fertilizer with percentage of 5 %, 10 %, and 15 % with a treatment period of 3, 7, and 14 days with Triaxial test
Soft clay soil samples taken in the area around UNSRI, Inderalaya, OI, South Sumatra
Summary
Tanah berperan penting pada suatu lokasi pekerjaan konstruksi sipil. Tanah lempung lunak merupakan suatu tanah yang mempunyai kandungan mineral-mineral lempung dan nilai kadar air yang tinggi sehingga kuat geser tanahnya rendah. Tanah lempung lunak juga mempunyai nilai kompressibilitas tanah yang tinggi menyebabkan daya dukung tanahnya menjadi rendah. Adapun tujuan dari perbaikan tanah adalah sebagai berikut : Menaikkan daya dukung dan kuat geser; Mengurangi kompressibilitas; Mengontrol stabilitas volume (shringking dan swelling); Memperbaiki kualitas material untuk bahan konstruksi; dan Memperkecil pengaruh lingkungan. Dalam penelitian ini akan dilakukan perbaikan tanah dengan pengujian terhadap pengaruh campuran pupuk urea pada tanah lempung lunak dalam skala laboratorium. Penggunaan pupuk urea sebagai bahan campuran diharapkan dapat meningkatkan daya dukung tanah lempung lunak dengan parameter kuat geser tanah (pengujian Triaxial)
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