Stabilisasi Tanah Lempung Ekspansif dengan Penambahan Campuran Bongkaran Bata Ringan terhadap Nilai CBR dan Kuat Geser pada Tanah Urugan (Studi Kasus: Kecamatan Sambikerep, Kota Surabaya).

Stabilization of Expansive Clay Soil with the Addition of Lightweight Brick Debris Mixture on CBR Value and Shear Strength of Fill Soil (Case Study: Sambikerep District, Surabaya City)

Pembangunan infrastruktur di Kecamatan Sambikerep, Kota Surabaya sering menghadapi masalah kestabilan tanah akibat sifat ekspansif dari lempung. Penelitian ini bertujuan untuk mengevaluasi pengaruh penambahan bongkaran bata ringan terhadap stabilitas tanah lempung ekspansif dengan menggunakan uji California Bearing Ratio (CBR) dan Direct Shear Test. Metode penelitian ini adalah eksperimen dengan variasi penambahan serbuk bata ringan sebanyak 0%, 10%, 20%, 30%, dan 40% pada tanah lempung ekspansif, yang kemudian diuji setelah 24 jam pemeraman. Hasil penelitian menunjukkan bahwa penambahan serbuk bata ringan meningkatkan nilai CBR tanah secara signifikan; penambahan 10% dan 20% serbuk bata ringan masing-masing meningkatkan nilai CBR sebesar 10% dan 11,7%. Penambahan serbuk bata ringan juga mempengaruhi nilai Direct Shear Test, dengan variasi 20% menghasilkan nilai kohesi tertinggi sebesar 0,1857 kg/cm² dan sudut geser sebesar 17,03°. Berdasarkan hasil tersebut, campuran serbuk bata ringan yang optimal untuk stabilisasi tanah lempung ekspansif adalah pada persentase 10% dan 20%, yang efektif dalam meningkatkan stabilitas dan kekuatan mekanis tanah.

Kata kunci : Tanah lempung, stabilisasi tanah, bata ringan, california bearing ratio, direct shear test

 Infrastructure development in Sambikerep District, Surabaya City, frequently encounters soil stability issues due to the expansive nature of clay soil. This study aims to evaluate the impact of adding lightweight brick debris on the stability of expansive clay soil using the California Bearing Ratio (CBR) and Direct Shear Test. The research employs an experimental method with varying percentages of lightweight brick powder added—0%, 10%, 20%, 30%, and 40%—to the expansive clay soil, which is then tested after 24 hours of curing. The results indicate that the addition of lightweight brick powder significantly improves the soil's CBR value; adding 10% and 20% of brick powder increases the CBR value by 10% and 11.7%, respectively. The addition of brick powder also affects the Direct Shear Test results, with the 20% mix achieving the highest cohesion value of 0.1857 kg/cm² and a shear angle of 17.03°. Based on these results, the optimal brick powder mixture for stabilizing expansive clay soil is 10% and 20%, which effectively enhances the soil’s stability and mechanical strength.

Keywords: Expansive clay soil, soil stabilization, lightweight brick debris, California Bearing Ratio, Direct Shear Test