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Angelina, Sherlin
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Civil Engineering, Building, Construction & Architecture

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STUDI PERBANDINGAN NILAI UNDRAINED SHEAR STRENGTH TERHADAP NILAI LIQUID LIMIT TANAH LEMPUNG Angelina, Sherlin; Prihatiningsih, Aniek
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 1, Februari 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i1.32590

Abstract

The correlation analysis between undrained shear strength (Su) and liquid limit (LL) was conducted on clay soils sampled from North Jakarta to evaluate the potential for predicting Su values based on LL parameters. Clay soils are known for their high plasticity, which is influenced by moisture content, making Su and LL critical parameters in geotechnical stability analysis. In this research, Su values were obtained using the Triaxial UU method, while LL values were determined using the Casagrande method and the fall cone test. Exponential regression analysis was used to measure the correlation between Su and LL. Results showed that the Casagrande method generated a coefficient of determination (R2) calculated at 0,9676, indicating a strong correlation for predicting Su. In comparison, the fall cone test method produced a lower coefficient of determination, which is 0,5827. These results imply that LL, especially from the Casagrande method, can be used as a preliminary estimate of Su values, allowing for time and cost efficiency by reducing the need for Triaxial UU testing. Further studies with varied samples and mineral analysis of clay soils are recommended to enhance the accuracy and reliability of these findings. Abstrak Analisis korelasi antara undrained shear strength (Su) dan liquid limit (LL) dilakukan pada sampel tanah lempung yang diambil dari Jakarta Utara untuk mengevaluasi potensi prediksi nilai Su berdasarkan parameter LL. Tanah lempung dikenal memiliki karakter plastisitas tinggi yang dipengaruhi oleh kadar air, sehingga parameter Su dan LL sangat penting dalam analisis stabilitas geoteknik. Pada penelitian ini, nilai Su diperoleh menggunakan metode Triaxial UU, sementara nilai LL diperoleh dengan metode Casagrande dan fall cone test. Analisis regresi eksponensial digunakan untuk mengukur korelasi antara Su dan LL. Hasil menunjukkan bahwa metode Casagrande menghasilkan koefisien determinasi (R2) sebesar 0,9676 yang mengindikasikan korelasi kuat untuk memprediksi Su. Sebaliknya, metode fall cone test menghasilkan koefisien determinasi yang lebih rendah, yaitu 0,5827. Hasil ini menyiratkan bahwa LL, terutama dari metode Casagrande, dapat digunakan sebagai estimasi awal nilai Su, sehingga memungkinkan efisiensi waktu dan biaya tanpa melakukan pengujian Triaxial UU. Studi lanjutan dengan variasi sampel dan analisis mineral tanah lempung disarankan untuk memperkuat keakuratan hasil ini.
STATISTICAL CORRECTION OF A DYNAMIC PILE BEARING CAPACITY FORMULA BASED ON PDA DATA Angelina, Sherlin; Wijaya, Hendy; Iskandar, Ali; Johan, Agus; Kawanda, Aksan; Purnomo, Daniel Tri
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 3, Agustus 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i3.34184

Abstract

The calculation of pile bearing capacity using a dynamic formula is considered a practical approach for evaluating the capacity of foundation piles. However, its results are often questioned when compared to the CAPWAP analysis outcomes derived from PDA testing. This study aims to assess the accuracy of the dynamic formula, develop a correction model using a statistical approach in the form MLR, and evaluate the effectiveness of the resulting correction model in predicting pile bearing capacity. A total of 84 pile datasets were utilized in this research, comprising various pile dimensions and PDA-derived parameters, including the maximum energy transferred to the pile (EMX), permanent pile settlement (S = DFN), and elastic settlement (C = DMX – DFN). The analysis results indicated that the dynamic formula could be corrected using the MLR approach. The correction model produced multiplier coefficients of 1.09 for parameter S and 0.67 for parameter C, with a coefficient of determination of 0.96 and a MAPE value of 19.21%, which represents the average deviation of the predicted results from the actual values and falls into the accurate category based on Lewis’ classification. The model is deemed sufficiently reliable for use as an alternative method in the preliminary evaluation of pile bearing capacity. Abstrak Perhitungan daya dukung tiang menggunakan formula dinamik merupakan pendekatan praktis dalam mengevaluasi kapasitas tiang fondasi. Namun, hasil perhitungannya kerap diragukan jika dibandingkan dengan hasil analisis CAPWAP dari uji PDA. Penelitian ini bertujuan untuk mengevaluasi akurasi formula dinamik, mengembangkan model koreksi dengan pendekatan statistik berupa MLR, serta menilai efektivitas model koreksi yang dihasilkan dalam memprediksi daya dukung tiang. Pada penelitian ini digunakan 84 data tiang dengan variasi dimensi tiang dan parameter dari uji PDA yang berupa energi maksimum yang tertransfer ke tiang (EMX), penurunan permanen tiang (S = DFN), dan penurunan elastis tiang (C = DMX – DFN). Hasil analisis menunjukkan bahwa formula dinamik dapat dikoreksi melalui pendekatan MLR. Model koreksi menghasilkan koefisien pengali untuk parameter S sebesar 1,09 dan C sebesar 0,67, serta memiliki koefisien determinasi sebesar 0,96 dan nilai MAPE yang menunjukkan rata-rata deviasi hasil prediksi terhadap aktual sebesar 19,21%, yang termasuk dalam kategori akurat menurut klasifikasi Lewis. Model ini dinilai cukup andal untuk digunakan sebagai pendekatan alternatif dalam tahap evaluasi awal daya dukung tiang.
Co-Authors Aniek Prihatiningsih Iskandar, Ali Johan, Agus Kawanda, Aksan Purnomo, Daniel Tri Wijaya, Hendy