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ITS » Master Theses » Geoteknik S2
Posted by yeni at 11/05/2009 16:08:13  •  6276 Views


KORELASI ANTARA CBR DENGAN PARAMETER FISIS TANAH TIMBUNAN REKLAMASI

CORRELATION BETWEEN CBR WITH PHYSICAL PARAMETER OF RECLAMATION EMBANKMENT SOIL

Created by :
Mohamed, Bourada 



SubjectTanah(Teknologi)
Keywordtimbunan
reklamasi
parameter fisis
CBR

Description:

Pertumbuhan penduduk yang tinggi mengakibatkan lahan hunian semakin sempit dan perlu adanya pengembangan lahan. Salah satu cara untuk tujuan pengembangan kawasan dengan cara reklamasi. Reklamasi adalah suatu pekerjaan penimbunan tanah dengan skala volume dan luasan yang sangat besar pada suatu lahan atau kawasan kosong dan berair seperti di kawasan pantai, daerah rawa, sungai, danau dan suatu lokasi di laut. Pada saat pelaksanaan reklamasi pantai kebutuhan material timbunan sangat besar. Selain persyaratan umum yang harus dipenuhi sebagai material timbunan yaitu pasir minimum 80% dan lanau-lempung maksimum 20% (Wahyudi, Herman, 1997, Teknik Reklamasi, Teknik Sipil ITS, Surabaya), persyaratan kepadatan juga harus dipenuhi. Pihak Kontraktor, sebagai pelaksana lapangan, ingin mengetahui secara cepat dan mudah pada saat material timbunan tiba di lapangan, dengan hanya melakukan salah satu test kepadatan misal CBR, maka tanpa harus melakukan tipe test kepadatan yang lainnya, dapat diketahui parameter kepadatan tanah yang lain, misal dry density, angka pori dan porositas. Penelitian melalui uji laboratorium untuk mempelajari korelasi antara CBR dengan parameter fisis tanah timbunan reklamasi ini menggunakan material timbunan yang terdiri dari lempung-lanau (lolos ayakan No. 200 atau diameter 0,075 mm) dan pasir (lolos ayakan No.10 atau diameter 2 mm). Sampel dibuat 5 macam dengan komposisi pasir : lempung-lanau sebagai berikut 100% : 0% , 95% : 5% , 90% : 10% , 85% : 15% , 80% : 20% . Langkah selanjutnya pemadatan modified proctor dengan jumlah sampel 60 sampel (6 variasi x 5 sampel/variasi x 2 sampel kondisi jenuh–tidak jenuh). Tahap berikutnya adalah pengujian harga CBR sebanyak 60 sampel (6 variasi x 5 sampel/variasi x 2 sampel kondisi jenuh –tidak jenuh) dengan kondisi jenuh (direndam) dan tidak jenuh (tidak direndam). Tahap akhir adalah pengujian Volumetric-Gravimetri dan spesific gravity sebanyak 120 sampel (6 variasi x 5 sampel/variasi x 2 sampel kondisi jenuh–tidak jenuh x 2). Hasil penelitian menunjukkan bahwa semakin besar nilai CBR maka semakin besar nilai berat volume kering (γd), semakin kecil nilai angka pori (e) dan porositas (n), dan sebaliknya. Nilai γd terbesar didapatkan dari campuran 90% pasir dengan 10% lempung-lanau, dimana pada kondisi tidak jenuh dengan (CBR = 44,068%) dan pada kondisi jenuh dengan (CBR = 21,3099%) didapatkan harga γd yang sama (γd = 2 t/m3). Hasil percobaan dinyatakan pula dengan hubungan antara γd dengan CBR, dimana secara regresi linier untuk tanah tidak jenuh adalah (CBR = 31,989. γd -20,096) dan untuk tanah jenuh dinyatakan dengan (CBR = 58,014. γd - 92,613). Persamaan antar parameter ini hanya valid digunakan untuk material reklamasi dengan komposisi pasir minimal 80% dan lempung-lanau maksimal 20%.


Alt. Description

The high population growth causes residence area to become nerrower and nerrower, so it is required to develop the area. One of the several ways for developing the area is reclamation. Reclamation is soil embankment with very large scale of volume and width in an area or free and watery zone, such as coastal area, swamp, river, lake and a location in sea. In coastal reclamation, it is required a great deal of embankment material. There are prerequisites that have to be fulfilled as embankment material. The general prerequisites are 80% minimum sand and 20% maximum silt-clay. Whereas another prerequisite is compaction (Wahyudi, Herman, 1997, Teknik Reklamasi, Teknik Sipil ITS, Surabaya). Contractor as a reclamation implementer on site that wants to know embankment material fastly and easily is only by conducting CBR test a kind of density test, it is without conducting other types of density test. By using this test, it is known other parameters of soil density, such as dry density, void ratio and porosity. This research is carried out by means of laboratory test for studying correlation between CBR with physical parameter of reclamation embankment soil. This test uses embankment materials, namely : clay-silt (sieve releasing No.200 or material with diameter 0.075 mm) and sand (sieve releasing No.10 or material with diameter 2 mm). There are 5 samples with composition of sand : clay-silt, such as 100% : 0%, 95% : 5% , 90% : 10%, 85% : 15%, 80 % : 20 %. The test is conducted with the following steps. The first step is modified proctor compaction with 60 total samples (6 variations x 5 samples/variations x 2 samples saturated-unsaturated of condition). The next step is CBR value test using 60 samples (6 variations x 5 samples/variations x 2 samples of saturated-unsaturated condition) with saturated condition (soaked) and unsaturated condition (unsoaked). The last step is volumetric-gravimetry and specific gravity tests using 120 samples (6 variations x 5 samples/variations x 2 saturated condition samples – 2 unsaturated condition samples). The result of this research indicates that the larger of CBR value, the heavier the weight of dry volume (γd), the less of void ratio (e) and porosity (n), and on the contrary. The largest γd value is obtained from mixture of 90 % sand and 10 % clay-silt where in unsaturated condition with CBR value (CBR = 44.068 %) and in saturated condition with CBR value (CBR = 21.3099 %), it is obtained the same γd value (γd = 2 t/m3). The research result is also indicated with correlation between γd with CBR, that in linear regression, unsaturated soil is (CBR = 31,989. γd -20,096) and saturated soil is indicated with (CBR = 58,014. γd - 92,613). The equation between these parameters is valid whenever it is used for reclamation material with 80% minimum sand and 20% maximum clay-silt compositions.

Contributor:
  1. Prof. Dr. Ir. Herman Wahyudi
Date Create:11/05/2009
Type:Text
Format:pdf.
Language:Indonesian
Identifier:ITS-Master-3100009034026
Collection ID:3100009034026
Call Number:RTS 624.162 Moh k


Source :
Master Theses, CIVIL ENGINEERING ,RTS 624.162 Moh k, 2008

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Rights :
Copyright @2008 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library


Publication URL :
http://digilib.its.ac.id/korelasi-antara-cbr-dengan-parameter-fisis-tanah-timbunan-reklamasi-4090.html




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