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ITS » Master Theses » Geoteknik S2
Posted by yeni at 22/05/2009 10:11:58  •  5949 Views


KORELASI ANTARA GRADASI MATERIAL TIMBUNAN REKLAMASI DENGAN KEPADATAN DAN KUAT GESER TANAH

CORRELATION BETWEEN MATERIAL GRADATION OF RECLAMATION EMBANKMENT WITH DENSITY AND SHEAR STRENGTH OF SOIL

Author :
Prihatin, Kukuh 




ABSTRAK

Pengembangan lahan dengan cara penimbunan reklamasi memerlukan material yang harus memenuhi persyaratan gradasi butiran berupa kerikil maksimum 30 pasir minimum 50 dan lanau-lempung maksimum 20 disamping persyaratan kepadatan timbunan. Pihak pelaksana lapangan umumnya ingin mengetahui secara cepat dan mudah dari material yang tiba di lapangan hanya dengan pengujian ayakan langsung dapat ditentukan derajat kepadatannya tanpa harus melakukan uji kepadatan. Selain itu adanya kesulitan dalam menentukan tingkat kepadatan tanah timbunan reklamasi sebagai akibat adanya perubahan gradasi tanah timbunan yang tiba di lapangan didominasi lanau-lempung. Perubahan kadar air juga sangat berpengaruh terhadap kualitas kepadatan akibat adanya musim penghujan dan pasang surut air. Posisi muka air juga mempengaruhi kondisi tanah timbunan menjadi jenuh dan tidak jenuh. Semua permasalahan ini akan mempengaruhi daya dukung tanah timbunan reklamasi yang terlihat dari kuat geser tanah yaitu sudut geser dalam efektif dan kohesi efektif C tanah. Penelitian melalui uji laboratorium untuk mempelajari korelasi antara gradasi material timbunan reklamasi dengan kepadatan dan kuat geser tanah ini menggunakan material timbunan yang diambil dari quarry sungai pantai dan bukit dengan persyaratan lanau-lempung maksimum 20 dan pasir minimal 80 dengan material kerikil terwakili oleh pasir. Material timbunan tersebut dilakukan analisa ayakan dan hidrometer. Dari hasil ayakan tersebut dibuat grafik gradasi berdasarkan metode USCS untuk menentukan Cu koefisien keseragaman dan Cc koefisien curvature. Langkah selanjutnya pemadatan Modified Proctor dengan jumlah sampel sebanyak 50 sampel 10 lokasi x 5 sampellokasi. Tahap akhir adalah pengujian kuat geser tanah dengan uji Direct Shear sebanyak 60 sampel 10 lokasi x 3 sampellokasi x 2 sampel kondisi jenuh-tidak jenuh dengan kadar air kondisi jenuh pada garis Zero Air Void dan tidak jenuh pada kadar air optimum wopt yang ditentukan dari grafik pemadatan untuk memperoleh kohesi dan sudut geser dalamnya. Hasil penelitian menunjukkan bahwa semakin besar CcCu tanah semakin homogen maka semakin kecil berat volume kering maksimum dmax dmax -0808.CcCu 2061 dan semakin besar wopt wopt 7512.CcCu 9492 dan sebaliknya. Sedangkan semakin besar nilai CcCu maka semakin kecil nilai kohesi efektif C dan sudut geser dalam efektif . Kondisi tidak jenuh menunjukkan nilai yang lebih besar C -0088.CcCu 0087 dan -29886.CcCu 53309 dibandingkan pada kondisi jenuh C -0057.CcCu 0072 dan -33052.CcCu 48761 pada nilai CcCu yang sama. Persamaan antar parameter ini hanya valid digunakan untuk material timbunan reklamasi dengan komposisi pasir minimal 80 dan lanau-lempung maksimal 20 serta batas Cu adalah 1 Cu 50.


ABSTRACT

Land development with reclamation embankment requires material that has to fulfill prerequisite of granule gradation in the form of 30 maximum gravel 50 minimum sand and 20 maximum silt-clay and another prerequisite is embankment compaction. The reclamation implementer on site that is generally want to know the embankment material fast and easily is only by testing the sieve directly. It can be determined the density level of reclamation embankment soil as a result of the embankment soil gradation change in site which is dominated with silt-clay. The change of water content is also influential toward density quality it is a result of rainy season and neap-tide.. The position of water surface also influences embankment soil condition to become saturated and unsaturated soil. All of this problems will influence carrying capacity of reclamation embankment soil indicated from soil shear strength that is effective internal friction angle and effective cohesion C of soil. This research is carried out by means of laboratory test for studying correlation between material gradation of reclamation embankment with density and shear strength of soil. The test is conducted with the following steps This test uses embankment material picked up from river coastal and hill quarry with prerequisites such as 20 maximum silt-clay and 80 minimum sand with gravel material represented by sand. In the embankment material it is conducted the sieve and hydrometer analysis. From the sieve result it is made gradation graph based on USCS method for determining Cu uniform coefficient and Cc curvature coefficient . The next step is compaction of Modified Proctor with 50 total samples 10 locations x 5 sampleslocations . The last step is test of soil shear strength with 60 samples of Direct Shear Test 10 locations x 3 sampleslocations x 2 samples of saturated-unsaturated initial condition with water content of initial saturated condition at Zero Air Void Line and unsaturated initial condition at optimum water content wopt that are determined from compaction graph for obtaining effective cohesion and the angle of effective internal friction. The result of this research indicates that the greater CcCu the more homogenous soil the less maximum dry density dmax dmax -0808.CcCu 2061 and the greater wopt wopt 7512.CcCu 9492 and on the reverse. Whereas the larger the value of CcCu the less value of effective cohesion C and the angle of effective internal friction . Unsaturated condition shows the more value C -0.088.Cc0.087 and - 29.886.CcCu 48.761 compared with saturated condition C -0057.CcCu 0072 dan -33052.CcCu 48761 at the same CcCu value. The equation between parameters is valid whenever it is used for reclamation embankment material with 80 minimum sand and 20 maximum silt-clay compositions and 1 Cu 50.



Keywordsgradasi; timbunan; reklamasi; kepadatan; kuat geser tanah
 
Subject:  Tanah(Teknologi)
Contributor
  1. Prof. Dr. Ir. Herman Wahyudi
Date Create: 22/05/2009
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Master-3100009034311
Collection ID: 3100009034311
Call Number: RTS 624.151 363 Pri k


Source
Master Theses, CIVIL ENGINEERING ,RTS 624.151 363 Pri k, 2008

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