scholarly journals KARAKTERISTIK KUAT GESER TANAH GAMBUT AKIBAT PEMAMPATAN

2018 ◽  
Vol 4 (2) ◽  
pp. 67-79
Author(s):  
Remon Muslim ◽  
Ferry Fatnanta ◽  
Muhardi M
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Natural Condition ◽  
Shear Test ◽  
Void Ratio ◽  
Disturbed Condition ◽  
Compression Behaviour ◽  
Vane Shear Test ◽  
Different Characteristics ◽  
Low Shear

Peat has different characteristics compared to clay. It is physically recognized as soil with organic materials content, great amount of water, high void ratio, and the existence of fibers. However, it technically has high compressibility and low shear strength. To identify how big is the influence of compression behaviour towards the increment of peat`s shear strength, some consolidation and vane shear test need to be performed in order to obtain a proper method to initiate constructions on peat. This research used amorphous peat samples which were taken from Tambang, Kampar district in disturbed condition. They consisted of two variations, i.e.: natural condition, and non-fiber condition. The used equipments were modified consolidometer with diameter of 15 cm and height of 15 cm, and also vane shear instruments. The loads were gradually applied with magnitude of 10 kPa, 20 kPa, 40 kPa, 80 kPa, 160 kPa and 320 kPa, each of them were elevated every ±14 days, and a vane shear test was performed before the load was added. The results showed that the shear strength has been increasing due to the higher compression, as well as the void ratio. In case the void ratio gets smaller, the shear strength has increased. Hence, peat`s bearing capacity will increase along with the higher shear strength.

scholarly journals Comparative Study in Method of Compaction by Consolidated Drained and Direct Shear Test

2020 ◽  
Vol 78 (2) ◽  
pp. 143-152
Author(s):  
Abdul Samad Abdul Rahman ◽  
N. Sidek ◽  
Juhaizad Ahmad ◽  
N. Hamzah ◽  
M. I. F. Rosli
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Triaxial Test ◽  
Direct Shear Test ◽  
Shear Test ◽  
Void Ratio ◽  
Direct Shear ◽  
Test Results ◽  
Stress Strain ◽  
Strain Behaviour

Soil compaction has been a common practice in the construction of highways, embankments, earth dams and other related structures where the condition of the soil is high in void ratio and therefore having a very low in bearing capacity. Therefore, the soil needs to be compacted in order to minimize the void ratio and in the same time would results in having a very high bearing capacity to sustain load. Nevertheless, only a few researches have been done to investigate the method of compaction using different energy on the behavior of shear strength by consolidated drained and direct shear test. In this research, the effect of different compaction in energy of 25 number of blows compared to 40 number of blows on the stress-strain behaviour of drained triaxial test has been done and findings of the data are to be compared with direct shear test. Results reveal that there is an increase in soil unit weight by using different energy in compaction with an increase of 5% from 1790 kg/m3 to 1880 kg/m3 for 25 and 40 number of blows respectively. However, the stress-strain behaviour of the specimens shows differently when compared between consolidated drained triaxial and direct shear test. The shear strength for direct shear-stress is at higher value compared to drained triaxial test. For drained triaxial test, results reveal that the effective friction angles are increase only about 1% from 37° to 38°. This is due to the soil particles rearranging itself with the different applied pressures thus eliminating the effects of different energy on the shear strength of the specimens. However, for direct shear test, the shear strength increases drastically from 29° to 32°. The increase of the shear strength is more likely influence by the soil particle arrangement due to the impact of the energy of the no of blows to the desired specimen.

scholarly journals Studi Eksperimen Pengaruh Penambahan Serabut Kelapa Terhadap Kohesi dan Sudut Geser Tanah Lempung

2021 ◽  
Vol 3 (2) ◽  
pp. 256-259
Author(s):  
Pebrinar Sangle
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Direct Shear Test ◽  
Shear Test ◽  
Clay Soil ◽  
Dry Weight ◽  
Strength Parameter ◽  
Direct Shear ◽  
Before And After ◽  
Coconut Fibers

This research is intended to study the shear strength of clay soil before and after adding coconut fibers. Shear strength is one of the factors that are taken into account to find the bearing capacity of the soil. Soil stability is a way to improve or change the nature of an unfavorable subgrade condition to be better in terms of the bearing capacity of the subgrade for the construction to be built on its Strength parameter testing shear using direct shear test equipment with total stress conditions. This research used coconut fiber variations of 0%, 1%, 2%, 3%, and 4% of the dry weight of the soil. The results of the direct shear test showed an increase in the value of soil cohesion (c) and shear angle (φ). This shows that the addition of coconut fibers to clay soil can increase the value of shear strength.

A revision of Blight's model of field vane testing

2000 ◽  
Vol 37 (5) ◽  
pp. 1089-1098 ◽  
Author(s):  
Peter Henri Morris ◽  
David John Williams
Keyword(s):  
Shear Strength ◽  
Shear Test ◽  
Test Methods ◽  
Excess Pore Pressure ◽  
Approximate Theory ◽  
Current Standard ◽  
Vane Shear Test ◽  
Undrained Strength ◽  
Excess Pore Pressures ◽  
Excess Pore

Vane shear test data obtained by a number of researchers show that the excess pore pressures generated within the soil surrounding the vane by vane insertion and rotation and their effects on the measured vane shear strength have been misinterpreted for many years. The accepted model developed by Blight of field vane testing and the accepted criteria for determining undrained and fully drained vane shear strengths are based on this misinterpretation. Consequently, estimates that are based on this model of the degree of drainage that has been attained at the time the vane shear strength is measured may be significantly in error, and the measured undrained shear strengths may be unconservative. A revision of Blight's approximate theory of field vane testing is presented which is consistent with the available experimental data. Revised practical criteria for determining the undrained and fully drained shear strengths are also presented, and a simple revision of current standard vane shear test methods is proposed which would eliminate, for all but those soils with very high coefficients of consolidation, the possibility that estimates of the undrained vane shear strength may be unconservative.Key words: vane shear, undrained strength, drained strength, excess pore pressure.

scholarly journals PENGARUH KADAR AIR TERHADAP BESARNYA PENURUNAN PADA UJI KONSOLIDASI

INFO-TEKNIK ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 41
Author(s):  
Ayu Purnama Sari ◽  
M. Ikhwan Yani ◽  
Suradji Gandi
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Water Content ◽  
Soil Sample ◽  
Clay Soil ◽  
Cohesive Soil ◽  
Know How ◽  
Consolidation Settlement ◽  
Original Water ◽  
Low Shear

Clay soil is a cohesive soil with low bearing capacity and low shear strength where the load on it will be limited. The addition of water content in clay soil will result in changes in soil volume that will affect the strength of the soil. The research aims to know how much water content affects the values of consolidation settlement. A consolidation test was carried out three times with variations of the original soil sample, 35% water content and 30% water content. The results obtained a settlement of 0,1864 cm for original water content, 0,1677 cm for 35% water content, and 0,1414 cm for 30% water content.

scholarly journals Tri-axial Shear Test of Different Damage Remolded Expansive Soil

2015 ◽  
Vol 9 (1) ◽  
pp. 826-829
Author(s):  
Liu Yongsheng ◽  
Wang Shiji ◽  
Dong Xinyu
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Shear Test ◽  
Expansive Soil ◽  
Strength Characteristics ◽  
Deformation Characteristics ◽  
Damage Area ◽  
Axial Shear ◽  
Shear Bearing Capacity ◽  
Deformation And Strength Characteristics

The deformation and strength characteristics of damaged remolded expansive soil are studied by the tri-axial tests of different bore diameter damaged expansive soil. The results show that the area and location of cylindrical bores have significant effect on the mechanical and deformation characteristics of the soil. Little damage can improve the shear bearing capacity of the specimen; but when the damage is large, the bearing capacity of the specimen is weakened with the increasing damage. Under the same shearing conditions, partial strain is less than 7%; the specimens with same damage area and different damage locations have the same force form; while if the partial strain exceeds by 7% in the same damage area, the bores are closer to the center of the specimen and the shear strength is smaller.

scholarly journals Mechanical Properties and Micro Mechanism of Nano-Clay-Modified Soil Cement Reinforced by Recycled Sand

2021 ◽  
Vol 13 (14) ◽  
pp. 7758
Author(s):  
Biao Qian ◽  
Wenjie Yu ◽  
Beifeng Lv ◽  
Haibo Kang ◽  
Longxin Shu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Void Ratio ◽  
Soil Mass ◽  
Direct Shear ◽  
Test Results ◽  
The Sustainable Development ◽  
Direct Shear Tests ◽  
Soil Cement ◽  
Nano Clay ◽  
New Material

To observe the effect of recycled sand and nano-clay on the improvement of the early strength of soil-cement (7d), 0%, 10%, 15% and 20% recycled sand were added. While maintaining a fixed moisture content of 30%, the ratios of each material are specified in terms of soil mass percentage. The shear strength of CSR (recycled sand blended soil-cement) was investigated by direct shear test and four groups of specimens (CSR-1, CSR-2, CSR-3 and CSR-4) were obtained. In addition, 8% nano-clay was added to four CSR groups to obtain the four groups of CSRN-1, CSRN-2, CSRN-3 and CSRN-4 (soil-cement mixed with recycled sand and nano-clay), which were also subjected to direct shear tests. A detailed analysis of the modification mechanism of soil-cement by recycled sand and nano-clay was carried out in combination with scanning electron microscopy (SEM) and IPP (ImagePro-Plus) software. The test results showed that: (1) CSR-3 has the highest shear strength due to the “concrete-like” effect of the incorporation of recycled sand. With the addition of 8% nano-clay, the overall shear strength of the cement was improved, with CSRN-2 having the best shear strength, thanks to the filling effect of the nano-clay and its high volcanic ash content. (2) When recycled sand and nano-clay were added to soil-cement, the improvement in shear strength was manifested in a more reasonable macroscopic internal structure distribution of soil-cement. (3) SEM test results showed that the shear strength was negatively correlated with the void ratio of its microstructure. The smaller the void ratio, the greater the shear strength. This shows that the use of reclaimed sand can improve the sustainable development of the environment, and at the same time, the new material of nano-clay has potential application value.

scholarly journals Effect of Urease Enzyme on Shear Strength of Clay Shale

2018 ◽  
Vol 7 (4.36) ◽  
pp. 424 ◽  
Author(s):  
Maxwel Joseph Henri Nainggolan ◽  
Wiwik Rahayu ◽  
Puspita Lisdiyanti
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Triaxial Test ◽  
Clay Soil ◽  
Soil Strength ◽  
Clay Shale ◽  
Strength Performance ◽  
Enzyme Mixture ◽  
Urease Enzyme

In recent years, utilization of biotechnology in geotechnical field has rapidly grown. One of the biotechnologies being utilized is urease enzyme, a stabilization material by bio-cementation method studied in this research.  Urease enzyme is manually mixed with additional 10% of clay soil to clay shale. The objective of mixing it is to increase the bearing capacity of the clay shale. Consolidated undrained triaxial test was performed for testing the soil strength performance for samples that had undergone curing for 2, 4, and 6 weeks. The results indicated that the sample stiffens, proved by the increase of shear strength from consolidated undrained triaxial test. The shear strength value produced by the variation of the urease enzyme mixture + 10% the clay is higher than that of without the original clay shale.  

Dynamic bending of plates with low shear strength

1972 ◽  
Vol 4 (4-6) ◽  
pp. 544-549
Author(s):  
B. L. Pelekh ◽  
G. A. Teters
Keyword(s):  
Shear Strength ◽  
Dynamic Bending ◽  
Low Shear

scholarly journals Influence of Structural Plane Microscopic Parameters on Direct Shear Strength

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Yanhui Cheng ◽  
Weijun Yang ◽  
Dongliang He
Keyword(s):  
Particle Size ◽  
Shear Strength ◽  
Internal Friction ◽  
Direct Shear Test ◽  
Shear Test ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Direct Shear ◽  
Stiffness Ratio ◽  
Structural Plane

Structural plane is a key factor in controlling the stability of rock mass engineering. To study the influence of structural plane microscopic parameters on direct shear strength, this paper established the direct shear mechanical model of the structural plane by using the discrete element code PFC2D. From the mesoscopic perspective, the research on the direct shear test for structural plane has been conducted. The bonding strength and friction coefficient of the structural plane are investigated, and the effect of mesoscopic parameters on the shear mechanical behavior of the structural plane has been analyzed. The results show that the internal friction angle φ of the structural plane decreases with the increase of particle contact stiffness ratio. However, the change range of cohesion is small. The internal friction angle decreases first and then increases with the increase of parallel bond stiffness ratio. The influence of particle contact modulus EC on cohesion c is relatively small. The internal friction angle obtained by the direct shear test is larger than that obtained by the triaxial compression test. Parallel bond elastic modulus has a stronger impact on friction angle φ than that on cohesion c. Under the same normal stress conditions, the shear strength of the specimens increases with particle size. The shear strength of the specimen gradually decreases with the increase of the particle size ratio.

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