Pengaruh Pengeringan, Pembasahan, Dan Infiltrasi Air Terhadap Parameter-Parameter Subgrade Jalan (Studi Kasus Ruas Jalan Bojonegoro KM 133)

Rinjani, Ridzky Wahyu and Suseno, Andy (2008) Pengaruh Pengeringan, Pembasahan, Dan Infiltrasi Air Terhadap Parameter-Parameter Subgrade Jalan (Studi Kasus Ruas Jalan Bojonegoro KM 133). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proses pembasahan dan pengeringan yang berlangsung terus-menerus pada subgrade jalan Bojonegoro KM 133 menyebabkan perubahan pada sifat fisik dan mekanik tanah. Tujuan penelitian ini adalah untuk mengetahui pengaruh pembasahan dan pengeringan serta infiltrasi air hujan terhadap parameter tanah subgrade jalan. Kekuatan geser tanah (kohesi) diketahui dari uji tekan bebas, sedangkan tegangan air pori negatif diukur dengan kertas filter Whatman No. 42, serta dilakukan pula uji infiltrasi.
Hasil percobaan menunjukkan bahwa pada proses pembasahan terjadi peningkatan derajat kejenuhan sebesar 13,15% dari kondisi inisial sebesar 42,04% menjadi 48,04% pada kondisi jenuh, dan penurunan sebesar 35,98% menjadi 6,06% pada kondisi kering udara. Pada pembasahan, tegangan air pori negatif berkurang 79,69% dari kondisi inisial sebesar 142,352 kPa menjadi 28,904 kPa, serta kohesi berkurang 16,24% dari kondisi inisial sebesar 0,4895 Kg/cm² menjadi 0,410 Kg/cm². Selama proses pengeringan dari kondisi inisial ke kondisi kering udara, tegangan air pori negatif meningkat menjadi 134.280,6 kPa dan kohesi meningkat menjadi 2,757 Kg/cm².
Dari percobaan juga ditunjukkan bahwa akibat infiltrasi air hujan, koefisien permeabilitas tanah mengalami kenaikan dari kondisi inisial 1,44 × 10⁻⁶ meter/detik menjadi 6,67 × 10⁻⁵ meter/detik pada pembasahan hingga jenuh, dan turun menjadi 9,73 × 10⁻¹⁴ meter/detik pada pengeringan hingga kering udara. Dari hasil pengukuran parameter tanah tersebut, dibuat simulasi numerik dengan menggunakan bantuan program PLAXIS untuk mengetahui deformasi pada tanah akibat beban gandar kendaraan. Hasil dari simulasi menunjukkan perkerasan dengan subbase CBC paling baik dalam menerima beban dalam kondisi tanah basah, sedangkan subbase Agregat A paling baik dalam kondisi tanah kering.
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Continuous wetting and drying processes occurring on the subgrade of the Bojonegoro road section KM 133 cause changes in the physical and mechanical properties of the soil. The objective of this research was to investigate the effect of wetting-drying cycles and rainwater infiltration on subgrade soil parameters. Soil shear strength (cohesion) was determined through unconfined compression tests, while negative pore water pressure (matric suction) was measured using Whatman No. 42 filter paper, alongside infiltration tests.
The experimental results indicated that during the wetting process, the degree of saturation increased by 13.15% from an initial condition of 42.04% to 48.04% at the saturated state, and decreased by 35.98% to 6.06% under air-dried conditions. During wetting, the negative pore water pressure decreased by 79.69% from an initial value of 142.352 kPa to 28.904 kPa, while cohesion decreased by 16.24% from an initial value of 0.4895 kg/cm² to 0.410 kg/cm². Throughout the drying process from the initial state to the air-dried condition, the negative pore water pressure increased to 134,280.6 kPa, and cohesion increased to 2.756 kg/cm².
The experiment also demonstrated that rainwater infiltration caused the soil's permeability coefficient to increase from an initial value of 1.44 × 10⁻⁶ m/s to 6.67 × 10⁻⁵ m/s during wetting up to saturation, and dropped to 9.73 × 10⁻¹⁴ m/s upon drying to an air-dried state. Based on the measured soil parameters, a numerical simulation was conducted using the PLAXIS program to determine soil deformation caused by vehicle axle loads. The simulation results showed that pavement utilizing a Cement Base Course (CBC) subbase performed best in accepting loads under wet subgrade conditions, whereas an Aggregate A subbase was optimal under dry subgrade conditions.

Item Type:	Thesis (Other)
Additional Information:	RSS 625.7 Rin p 2008
Uncontrolled Keywords:	Roads
Subjects:	T Technology > TE Highway engineering. Roads and pavements > TE175 Road and highway design T Technology > TE Highway engineering. Roads and pavements > TE215 Drainage
Divisions:	Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	magang .
Date Deposited:	28 Oct 2026 04:16
Last Modified:	28 Oct 2026 04:16
URI:	http://repository.its.ac.id/id/eprint/145961

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