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Analysis Of The Residual Red Soil Shear Test With The Slurry Method In The Regency Of Semarang

Analisis Uji Geser Tanah Merah Residual dengan Metode Slurry di Kabupaten Semarang

*Bambang Pardoyo scopus  -  Departemen Teknik Sipil, Fakultas Teknik, Universitas Diponegoro, Indonesia
Briota Akhbar Wirawan  -  Departemen Teknik Sipil, Fakultas Teknik, Universitas Diponegoro, Indonesia
Khoirul Huda  -  Departemen Teknik Sipil, Fakultas Teknik, Universitas Diponegoro, Indonesia
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Abstract
Residual soil is found in most areas with mountainous, hilly, and undulating topography. This soil is marked by red or brown color. This study aims to determine the physical and mechanical properties of soil in the original soil and residual soil conditions using the slurry method. Research objects were taken from residual red soil of The East Ungaran District, Bergas District, and Bawen District. Analysis of the physical and mechanical properties test shows that the soil sample is a type of clay with kaolinite constituent minerals and moderate swelling ability, and direct shear testing from locations L1, L2, and L3 obtained residual peak shear angles using the slurry method of 29,249 °; 31,341 °; 31,964 ° and constant residual shear angle value of 8,082 °; 8,138 °; 7,294 °, the value of the original soil shear angle has a value of 32.82 °; 31.44 °; 31.98. The higher the value of the plasticity index, the higher the value of the free swell. The relationship between the plasticity index and the value of the residual peak shear angle shows that the results of the peak shear angle and the plasticity index are still within the scope of standard deviation. The value of the constant residual shear angle with the slurry method is much smaller than the test result graph.
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Keywords: red soil; residual; slurry; direct shear; free swell

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