Pengaruh Konsentrasi NaCl terhadap Parameter Elastik Pasir Tersaturasi

Muammar Qadafi, Usman Malik

Sari


Abstrak

Telah dilakukan penelitian mengenai pengaruh konsentrasi larutan natrium klorinda (NaCl) yang disaturasikan pada sampel (core) pasir terhadap parameter elastik. Core dibuat dengan diameter 7,5 cm dan panjang 10 cm. Core dicetak dengan tekanan sebesar 5,8×104 N/m2. Core yang telah dicetak disaturasi dengan larutan NaCl yang divariasikan kosentrasinya dari 0 ppm hingga 360000 ppm (titik jenuh NaCl) selanjutnya dirambatkan gelombang seismik/elastik menggunakan Sonic Wave Analyzer (SOWAN), dari pengukuran ini akan diperoleh waktu tempuh gelombang (delay) pada sampel. Berdasarkan waktu tempuh, kecepatan gelombang primer dan sekunder pada Core diketahui. Hasil yang diperoleh berupa parameter elastisik dari Core seperti modulus Young, Modulus Bulk, Modulus Geser dan Konstanta Lame. Modulus Young Core berkisar antara 7,8×107Pa-1,8×109Pa, modulus Bulk sebesar 1,8×107Pa-8,9×108Pa, modulus geser antara 5,1×107Pa-7,6×108Pa dan Konstanta Lame berkisar antara 1,8×108Pa-3,4×109Pa.

 

Abstract

Research has been carried out on the effect of saturated sodium chloride (NaCl) solution concentration in sand samples (cores) on elastic parameters. This research was conducted to determine the differences in the elastic core parameters according to the concentration of NaCl that saturates them. The cores are made with a diameter of 7.5 cm and a length of 10 cm. The cores are molded at a pressure of 5,8×104 N/m2. The cores that have been printed are saturated with NaCl solution with varying concentrations from 0 ppm to 360000 ppm (saturation point of NaCl) then propagated seismic/elastic waves using a Sonic Wave Analyzer (SOWAN), from this measurement the wave travel time (delay) will be obtained in the sample. Based on the travel time, the primary and secondary wave velocities at the Core are known. The core elastic parameters was obtained such as Young's modulus, Bulk modulus, Shear modulus and Lame's constant. Young Core modulus ranges from 7,8×107Pa-1,8×109Pa, Bulk modulus of 1,8×107Pa-8,9×108Pa, shear modulus between 5,1×107Pa-7,6×108Pa and Lame Constant ranges between 1,8×108Pa-3,4×109Pa.


Kata Kunci


Core Pasir Tersaturasi; Konsentrasi NaCl; Parameter Elastik

Teks Lengkap:

PDF

Referensi


Ahied, M. (2010). Konversi Konstanta ELastik DInamik ke Statik pada Porositas Hidrokarbon Berpasir (Sandstone), Rekayasa, 3(2), 137-141.

al Hagre, S. A., & Müller, C. (2000). GPR study of pore water content and salinity in sand, Geophysical Prospecting, 48, 63–85.

Biot, M. (1998). Theory of Propagation of Elastic Waves in a Fluid Saturated Porous Solid. I Low Frequency. Geophysics Reprint Series, 10, 393-397.

Davis, R., Selvadurai, A. (1996). Elasticity and Geomechanics. Cambridge University Press: Newyork.

Kang, M., & Lee, J. S. (2015). Evaluation of the freezing – thawing effect in sand – silt mixtures using elastic waves and electrical resistivity. Cold Regions Science and Technology, 113, 1–11.

Li, M., Chai, S., Du, H., & Wang, C. (2016). Effect of chlorine salt on the physical and mechanical properties of inshore saline soil treated with lime. Soils and Foundations, 56(3), 327–335.

Qadafi, M., Amin, B., Edisar, M. (2015). Analisis kelayakgunaan air tanah dalam ditinjau dari aspek kualitas dan geologi lingkungan di Kota Tembilahan, Indragiri Hilir. Jurnal Ilmu Lingkungan, 9(2), 131-142.

Richardson, M., Brigs, K. (1993). Empirical Predictions of Seafloor Properties Based on Remotely Measured Sediment Impedance. Marine Geosciences Division, Naval Research Laboratory, Stennis Space Center MS 39529-5004.

Sudjianto, A. (2003). “Stabilisasi Tanah Lempung Ekspansif dengan Garam Dapur (NaCl)â€. Jurusan Teknik Sipil Universitas Widyagama: Malang.

Sun, Q., Li, D., & Wang, S. (2015). Test on triaxial shear of artificial frozen saline sand. Coal Technol, 34(4), 105–107.

Wang, Z., Nur, A. (1998). Elastic Wave Velocities in Pourous Media. Geophysic Reprint Series, 10, 233-239.

Xu, X., Wang, Y., Bai, R., Zhang, H., & Hu, K. (2016). Effects of sodium sulfate content on mechanical behavior of frozen silty sand considering concentration of saline solution. Results in Physics, 6, 1000–1007.

Zemansky. S. (1994). Fisika untuk Universitas 1. Binacipta: Jakarta.




DOI: https://doi.org/10.26760/rekalingkungan.v10i1.1-10

Refbacks

  • Saat ini tidak ada refbacks.



Terindeks:

 

Statistik Pengunjung