Dian Eksana Wibowo, Endaryanta Endaryanta, Novia Suryadwanti, Yuli Fajarwati, Muhammad Iwan Najib, Anita Widianti
Soft soil materials have effect that can interfere the strength and stability of a building. The effect properties of soft soil or clay are large shrinkage swelling, high plasticity, and low value of shear strength as well as bearing capacity. Several attempts to overcome these problems require soil improvement or soil reinforcement. The purpose of this study was to determine the type of soil, the effect of soil improvement using several variations of mixtures on the ultimate bearing capacity of the soil (qult), and the value of soil water content. This study uses an experimental method with soil loading. From the result, it is concluded that the classification of Imogiri soil, according USCS, was categorized as inorganic silt or diatomaceous fine sand with the code MH (elastic silt). On the other hand, Wates soil can be categorized as organic clay with moderate to high plasticity with OH code. According to AASHTO, Imogiri soil is classified as group A-7-5(11) and Wates soil is classified as group A-7-5(22). The effect of soil reinforcement can increase the ultimate bearing capacity, in Imogiri soil the highest ultimate bearing capacity is the chalk layer with mixed rice husk ash (TI KAC) with a value of 0.33 kg/cm2. In Wates soil, the highest ultimate bearing capacity is chalk layer with mixed rice husk ash (TW KAC) of 1.13 kg/cm2. The results of soil reinforcement with several variations that have been tested are able to reduce soil water content compared to unreinforced soil. © 2023 Author(s).
Department of Civil Engineering and Planning Education, Universitas Negeri Yogyakarta, Indonesia; Department of Civil Engineering, Universitas Muhammadiyah Yogyakarta, Indonesia
