scholarly journals Pengaruh Penambahan Serat Rami pada Tanah Terjun-Medan dengan Pengujian Standard Compaction, Triaxial Unconsolidated Undrained, dan Prediksi Balik dengan Plaxis 2D

2021 ◽  
Vol 2 (4) ◽  
pp. 626-644
Author(s):  
Handi Utama Thomas ◽  
Roesyanto Roesyanto ◽  
Rudi Iskandar
Keyword(s):  
Compaction Test ◽  
Soil Model ◽  
Standard Compaction

Tanah mempunyai peranan yang penting dalam konstruksi. Daya dukung tanah wajib mampu menahan beban struktur di atasnya. Problematika tanah lunak yang sering dijumpai seperti kerusakan jalan perkerasan lentur maupun kaku, kelongsoran timbunan, kelongsoran lereng, dan penurunan tanah yang menyebabkan kerusakan struktur. Diperlukan inovasi yang ramah lingkungan dalam penanganan tanah lunak tersebut secara in-situ disamping dengan pertimbangan dari segi ekonomis, waktu, dan ketersediaan material. Penelitian bertujuan untuk mengetahui pengaruh penambahan serat rami pada tanah terhadap kekuatan geser dan kepadatan kering maksimum tanah. Penelitian ini menggunakan serat rami yang dicampurkan secara acak dengan tanah dengan kadar rami sebesar 1%, 2%, 3%, 4% dan 5% dari berat tanah kemudian dilakukan compaction test dan Triaxial UU. Pengujian Triaxial UU dilakukan untuk tanah dengan kandungan serat maksimum. Hasil penelitian ini yaitu kepadatan kering maksimum (ℽdmax) tanah mengalami penurunan seiring dengan penambahan serat rami dimana ℽdmax tertinggi sebesar 1,595 g/cm3 sedangkan ℽdmax terendah sebesar 1,438 g/cm3. Penambahan serat rami sebesar 5% menghasilkan peningkatan pada nilai kekuatan geser (cu) hasil pengujian Triaxial UU sebesar 477,1% dari 1,05 kg/cm2 menjadi 5,01 kg/cm2. Hasil pemodelan Triaxial UU dengan pemodelan harderning soil model pada program Plaxis 2D cukup mendekati dengan hasil pengujian laboratorim dengan hasil tegangan deviatorik yang relatif sama.

Application of Vibration Test Methods in Cement-Treated Aggregate

2011 ◽  
Vol 308-310 ◽  
pp. 980-986 ◽  
Author(s):  
Jia Liu ◽  
Rong Hui Zhang ◽  
Can Qiang Mai
Keyword(s):  
Dry Weight ◽  
Test Methods ◽  
Compaction Test ◽  
Weight Density ◽  
Large Particles ◽  
Vibration Compaction ◽  
Granular Base ◽  
Dense State ◽  
Stable Material ◽  
Standard Compaction

The disease causes by the application of cement-stabilized macadam in our country first-class highway mainly performance as serious shrinkage fracture and other destructions like decreased capacity etc.This mainly related to test, design and other methods of the cement stabilized macadam. In the cement stabilization granular base construction,according to the standard job practice, uses the inorganic binding stable material compaction test to perform the standard compaction test. Doing compactness test at the scene, always present that the dry weight density is bigger than the maximum value result made by compaction test, result made by compactness test can more than 100%.The compaction principle of vibration compaction test is through pressure exciting force over the compacted materials,forced the downing of solid materials have a "resonance", In this state, the small particles aggregate can filling the gap between the large particles aggregate, to achieve the dense state. And during this process do not need too much water as lubricant. Therefore the vibration compaction test definite intensity result tallies with the scene reality. To imitation effects of roller compacted to improve the performance of cement stabilized gravel, the use of vibration method designed cement stabilized gravel is very necessary and timely.

The Improved Soil Model of Finite Compressible Layer

2012 ◽  
Vol 170-173 ◽  
pp. 64-67
Author(s):  
Li Na Yao ◽  
Guang Hua Yang ◽  
Peng Hua Wang
Keyword(s):  
Elastic Modulus ◽  
Half Space ◽  
Elastic Half Space ◽  
Foundation Settlement ◽  
Secant Modulus ◽  
Layer Model ◽  
Space Model ◽  
Soil Model ◽  
Engineering Practices

Choosing an accurate soil model is the key point in calculating the foundation settlement. The commonly used models in engineering practices are the Winkler’s model, elastic half space model and finite compressible layer model. Among these models, the finite compressible layer model is widely used in the designing of raft foundation. As the finite compressible layer model can not reflect the nature of the in situ soil and the nonlinear settlement, in this paper we try to modify the elastic modulus E by the secant modulus in order to improve the soil model of finite compressible layer.

scholarly journals A novel device for inclined compaction test on soils

2018 ◽  
Vol 192 ◽  
pp. 02054
Author(s):  
Panu Promputthangkoon ◽  
Tavorn Kuasakul
Keyword(s):  
Soil Sample ◽  
Soil Compaction ◽  
Lateritic Soil ◽  
Dry Density ◽  
Maximum Dry Density ◽  
Sloping Ground ◽  
Novel Device ◽  
Compaction Test ◽  
The Right ◽  
Standard Compaction

It can be said that the soil compaction test is currently the standard method for obtaining the right amount of water to be added in order to achieve a maximum dry density. Then, the water content obtained from laboratory work, known as optimum moisture content, is utilised in the field for compacting the soil. It should be noted that the compaction test is carried out on a soil sample prepared in a mould horizontally laid. In the field, however, quite often the compaction is done on side embankments or sloping grounds. Hence, using the laboratory result to control the field density for such cases is problematic. Therefore, this study developed a device that could be used to conduct the compaction test concerning the following conditions: (1) compaction is vertically applied to a soil sample inclined at various angles (VC), and (2) compaction is normal to an inclined soil sample (IC). Some initial tests on lateritic soil using both methods developed showed that at the same energy applied the densities are quite different. These results confirm that, in the case of sloping ground, the standard compaction test may not be appropriate.

scholarly journals Comparison of fly ash with Lapindo mud as a land stabilizer for landfill in Pasuruan–Indonesia

2021 ◽  
Vol 3 (10(111)) ◽  
pp. 19-26
Author(s):  
Agus Tugas Sudjianto ◽  
Abdul Halim ◽  
Oktiono Gembiranto ◽  
Sugeng Hadi Susilo
Keyword(s):  
Fly Ash ◽  
Shear Test ◽  
Dry Weight ◽  
Friction Angle ◽  
Shear Angle ◽  
Compaction Test ◽  
Land Condition ◽  
Mixed Soils ◽  
Better Than ◽  
Standard Compaction

The paper discusses the comparison of fly ash with Lapindo mud as a land stabilizer for a landfill in Pasuruan, Indonesia. Land for landfills has a low level of stability due to the condition of garbage that has accumulated and undergoes a process of decay. This land condition is less favorable to support the construction of the building above it if one day the location is used for construction. Therefore, it is necessary to stabilize the soil first. The purpose of this study was to determine the effect of adding a mixture of TPA soil with fly ash and Lapindo mud. The method used by sieve testing and compaction of the specimens for each treatment consisted of a mixture of TPA soil with fly ash and TPA soil with Lapindo mud, while the percentages of fly ash and Lapindo mud to the dry weight of the original soil were respectively 0 %, 10 %, 15 %, and 20 %. The results showed that stabilization of the landfill with fly ash reduced the silt content while stabilization with Lapindo mud increased the levels of silt in the landfill so that fly ash was better than Lapindo mud for stabilization of the landfill. The specific gravity values for both stabilization mixtures increased equally. Based on the results of the standard compaction test for the addition of a mixture of fly ash, the OMC value decreases and the greater the value of dmaxs indicates that fly ash is good for landfill stabilization, while the addition of a mixture of Lapindo mud increases the OMC the smaller the value of dmaxs. For the direct shear test of the two mixed soils, the value of the internal friction angle (Æ) increased. The percentage value of the optimum mixture of mixed soil+fly ash is 14 % with an internal shear angle (Æ) of 38°, while the stabilization of landfill with Lapindo mud obtained the optimum mixture percentage value of 11 % with an internal shear angle (Æ) of 31°

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