Karakteristik Mekanik Dan Dinamik Clay Shale Kabupaten Tuban Terhadap Perubahan Kadar Air

Ariesnawan, Rizka Adi (2015) Karakteristik Mekanik Dan Dinamik Clay Shale Kabupaten Tuban Terhadap Perubahan Kadar Air. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Beberapa masalah terjadi pada konstruksi di atas lapisan clay shale yang diakibatkan oleh investigasi awal yang kurang tepat. Parameter yang dipakai dalam perencanaan tidak memperhitungkan perubahan karakteristik akibat penggalian dan pelapukan yang terjadi pada clay shale. Penelitian ini bertujuan untuk mempelajari pengaruh perubahan kadar air terhadap karakteristik fisik, mekanik dan dinamik clay shale dengan proses pembasahan dan pengeringan. Clay shale diambil dari area penambangan PT. Semen Indonesia di Desa Meliwang, Kecamatan Kerek, Kabupaten Tuban. Penelitian yang dilakukan meliputi uji karakteristik fisik, mekanik, dan dinamik clay shale (pengujian volumetri gravimetri, batas-batas atterberg, analisa ayakan, tes suction, tes elemen bender, tes point load, dan uji keausan) terhadap perubahan kadar air. Persentase penambahan air ditentukan sebesar 20% dari selisih antara kadar air kondisi jenuh (wsat) dengan kadar air kering lapangan. Analisa kandungan kimia juga dilakukan pada clay shale di lokasi studi dengan diffraksi sinar X dan SEM. Hasil analisis mineralogi digunakan sebagai gambaran awal karakteristik clay shale. Hasil penelitian menunjukkan bahwa kandungan lempung dalam clay shale sangat mempengaruhi karakteristik fisik, mekanik, dan dinamik. Jenis mineral lempung pada clay shale menyebabkan perbedaan karakteristik penyerapan air dan berat spesifik. Mineral lempung illite dan montmorillonite pada clay shale mempunyai sifat penyerapan air yang tinggi. Pada saat pembasahan dari kondisi kering ke kondisi jenuh, terjadi peningkatan angka pori sebesar 116,73%. Setelah mengalami pembasahan dan pengeringan berulang, angka pori mengalami kenaikan sebesar 15,47% dari kondisi inisial. Pada akhir suklus ke-2, tegangan air pori negatif (-Uw) clay shale Tuban turun sebesar 73,95 %. Penurunan tegangan air pori diikuti dengan turunnya parameter dinamik dan mekanik clay shale. Modulus geser (Gmax) clay shale Tuban mengalami penurunan sebesar 82,93%. Kuat tekan (qu) clay shale Tuban juga mengalami penurunan sebesar 70,41% dari kondisi inisial setelah mengalami pengeringan pembasahan. Besar nilai Kuat tekan (qu) tertinggi diperoleh pada kondisi kering yaitu sebesar 44,773 kg/cm2. Penurunan kekuatan clay shale disebabkan oleh ii rekahan yang terjadi akibat kembang susut dan peralihan parameter dari kategori batuan menjadi tanah akibat pelapukan. Rentang perubahan parameter clay shale harus diperhatikan para ahli geoteknik pada saat menentukan parameter fisik, mekanik, dan dinamik pada proses perencanaan bangunan diatas lapisan clay shale. Berdasarkan hasil penelitian, penurunan parameter terjadi signifikan pada saat clay shale mengalami pembasahan satu kali (1 siklus). =============================================================================================== There are some problems happened to the construction on clay shale affected by some misaccuracies of soil investigation. The parameter isn’t concerned the change of characteristic due to digging and weathering process on clay shale. The aim of this research is to find out the changes of water content effect to the characteristic of clay shale that included physical, mechanical and dynamic properties within drying and wetting proccess. The clay shale is taken from mining area of PT. Semen Indo located in Meliwang village, subdistrict of Kerek, regency of Tuban. This research includes the examination of water content's influences to the physic, mechanic and dynamic characteristic of clay shale (volumetri gravimetri test, atterberg limits, particel size test, suction test, bender element test, point load test and durability test). The precentage of water adding divined gradually at 20% of saturated water content differ from air dried condition. The analysis of chemical contents also done at the research area with x-ray diffraction and scanning electron microscope test. The chemical analysis result used to show an initial behaviour of the characteristic of clay shale. The result of this research shows that the clay content of clay shale has significant effect on its physical, mechanical, and dynamic characteristics. The contained of clay mineral in clay shale caused the difference characteristic of the water absortion based on its spesific surface. The characteristic of Illite and montmorillonite on clay shale have higher water absorbtion compared to kaolinite. From air dried to the saturated conditions, the pore number increased about 116,73%. On the other hand that the clay shale came to high swelling potential. After drying-wetting cycle aplied, pore number increased 15,47% from its initial condition. At the end of the second cycle, the negative pore pressure value (-Uw) of Tuban's clay shale decreased about 73,95%. The decrease of pore number followed by the reduction of dynamic and mechanic parameter on clay shale. The dynamic shear modulus of Tuban's clay shale decreased about 82,93%. The compressive strength (qu) of Tuban's clay shale also decreased about 70,41% from the initial condition after drying wetting process. The highest undrained compressive strength (qu) reached at 44,73 kg/cm2 at the dried state. iv The decreasing of the clay shale streghtness caused by surface cracking during shrinking and the shifting of its parameter from rock to soil category due to weathering. The great changes of parameter’s range in clay shale must be considered when the geotechnical experts determine the physical, mechanical, and dynamic parameters when planning a building construction on it. Based on the result of the research, the decreasing occured significantly at one drying wetting cycle of clay shale.

Item Type: Thesis (Masters)
Additional Information: RTS 553.61 Ari k
Uncontrolled Keywords: clay shale, kadar air, mineralogi, parameter mekanik dan dinamik, pembasahan - pengeringan, Kabupaen Tuban
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.9 Composite materials
T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures--Models
T Technology > TC Hydraulic engineering. Ocean engineering > TC812 Irrigation
Divisions: Faculty of Civil Engineering and Planning > Civil Engineering > (S2) Master Theses
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 13 Jun 2017 02:19
Last Modified: 13 Jun 2017 02:19
URI: http://repository.its.ac.id/id/eprint/41609

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