PENGARUH TEKANAN MEKANIK UNIAXIAL DAN FAKTOR KEAMANAN TERHADAP PERUBAHAN STRUKTUR PORI PADA BATUAN PENUDUNG DAERAH POTENSI PANAS BUMI DI DAERAH KADIDIA-SIGI, SULAWESI TENGAH

• Main Author: Annisa Nadhira, - (Author)
• Format: Book
• Published: 2019-08-30.
• Subjects: Thesis; NonPeerReviewed
• Online Access: Link Metadata

Summary

Untuk meneliti perubahan struktur pori dan rekahan, dilakukan uji tekan uniaxial pada batu breksi terubah yang diperoleh dari lapisan penudung daerah panas bumi Kadidia-Sigi, Sulawesi Tengah. Perlakuan tekanan diawali dari tekanan alamiah 69,7 kg kemudian, 100 kg, 300 kg, 500 kg, 700 kg, dan 800 kg. Metode analisis citra digital digunakan pada penelitian ini untuk merekam dan menganalisis perubahan struktur pori dan rekahan. Hasil yang diperoleh berupa data kualitatif citra 2D dan 3D sementara, data kuantitatif berupa parameter fisis rekahan [orientasi {"θ" ("P" )} pada kuadran I, aperture {e(P)} bersifat polinomial berkorelasi positif, densitas "{Φ" ("P" )"}" bersifat polinomial berkorelasi negatif, dan intensitas {I(P)} yang mengalami kenaikan] dan parameter fisis pori [porositas "{ϕ" ("P" )"}" bersifat linear berkorelasi negatif, luas permukaan spesifik {SsA(P)} bersifat polinomial berkorelasi positif, tortuositas "{τ" ("P" )"}" dan permeabilitas "{k" ("P" )"}" ]. Perubahan sifat fraktal rekahan merupakan dampak dari berubahnya elemen mikrostruktur batuan yang menghasilkan persamaan yang menunjukan dimensi fraktal fungsi tekanan. Selain itu, dari hasil uji tekan uniaxial dapat diketahui kekuatan batuan ini sehingga memberikan gambaran karakteristik dan keamanan lapisan penudung daerah panas bumi Kadidia. To investigate the pore and fracture evolution, a series of uniaxial compression test was conducted on an altered breccia rock, was taken from potential geothermal area at Kadidia-Sigi, Sulawesi Tengah. The treatments of uniaxial compression strarted from natural pressure 69,7 kg then, 100 kg, 300 kg, 500 kg, 700 kg, and 800 kg. Digital image processing method was applied to record and analyze the deformation of pore and crack structure. The results are qualitative data in the form of 2D and 3D images while quantitative data in the form of physical fracture parameters [orientation {"θ" ("P" )} in quadrant I, aperture {e(P)} is polynomial positively correlated, density "{Φ" ("P" )"}" is polynomial negatively correlated, and intensity {I(P)} is increasing] and physical pore parameters [porosity "{ϕ" ("P" )"}" is linear negatively correlated, specific surface area {SsA(P)} is polynomial positively correlated, tortuosity "{τ" ("P" )"}" , and permeability "{κ" ("P" )"}" ]. The change at fractal fracture properties is an effect of changing microstructure elements which yields an equation fractal dimension as a function of pressure. Furthermore, the other side of the result of uniaxial compression test represented a strength of the rock which represented an overview of characteristic and clay cap stability on geothermal area Kadidia.

Item Description

http://repository.upi.edu/42055/1/S_FIS_1505659_Title.pdf
http://repository.upi.edu/42055/2/S_FIS_1505659_Chapter1.pdf
http://repository.upi.edu/42055/3/S_FIS_1505659_Chapter2.pdf
http://repository.upi.edu/42055/4/S_FIS_1505659_Chapter3.pdf
http://repository.upi.edu/42055/5/S_FIS_1505659_Chapter4.pdf
http://repository.upi.edu/42055/6/S_FIS_1505659_Chapter5.pdf
http://repository.upi.edu/42055/7/S_FIS_1505659_Appendix.pdf