Effects of Shear Box Size on Shear Strength between Modified Sand-Column (PFA-Sand Mixture) and Soft Soil

2017 ◽  
pp. 13-18
Author(s):  
Shakri M. S ◽  
Md. Noor M. J. ◽  
Nazaruddin A. T. ◽  
Hafez M. A.
Keyword(s):  
Shear Strength ◽  
Soft Soil ◽  
Sand Column ◽  
Sand Mixture ◽  
Shear Box

Incorporating Waste Material in Road Construction for Sustainable Development

2018 ◽  
Vol 382 ◽  
pp. 235-240
Author(s):  
Mohamad Shakri Shariff bin Mohmad Shariff ◽  
Muhammad Siddiq Farouq bin Md Noor
Keyword(s):  
Soft Soil ◽  
Road Construction ◽  
Load Test ◽  
Unconfined Compression Test ◽  
Sand Column ◽  
Plate Load Test ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash ◽  
The Right ◽  
Shear Box

Waste materials such as Pulverized Fuel Ash (PFA) is a possible alternative to reduce disposal activities and this study is to investigate suitability of PFA by conducting three laboratory tests namely unconfined compression test (UCT), shear box test (SBT) and plate load test. Both UCT and SBT to determine the optimum configuration of PFA that able to achieve the highest percentage of strength of PFA-cement-sand column, meanwhile plate load test is to study the effectiveness of using PFA-cement-sand column in the aspect of the bearing capacity for soft soil. In this study, it was investigated that by using the right configuration of PFA, cement and sand, it can produce a good product of sand column for the purpose of road construction. The highest shear strength was recorded is 93.51 kPa and the proportion of materials is 12%: 60: 28% (ratio of cement: PFA: sand).

Prediction of shear strength of soft soil using machine learning methods

CATENA ◽  
2018 ◽  
Vol 166 ◽  
pp. 181-191 ◽  
Author(s):  
Binh Thai Pham ◽  
Le Hoang Son ◽  
Tuan-Anh Hoang ◽  
Duc-Manh Nguyen ◽  
Dieu Tien Bui
Keyword(s):  
Machine Learning ◽  
Shear Strength ◽  
Soft Soil ◽  
Learning Methods ◽  
Machine Learning Methods

scholarly journals Effect of Sand Percentage on the Compaction Properties and Undrained Shear Strength of Low Plasticity Clay

2021 ◽  
Vol 9 (1) ◽  
pp. 16-20
Author(s):  
Iyad Alkroosh ◽  
Ali Al-Robay ◽  
Prabir Sarker ◽  
Saif Alzabeebee
Keyword(s):  
Shear Strength ◽  
Moisture Content ◽  
Undrained Shear Strength ◽  
Optimum Moisture Content ◽  
Dry Density ◽  
Sand Content ◽  
Compression Tests ◽  
Maximum Dry Density ◽  
Sand Mixture ◽  
Undrained Shear

This paper investigates the influence of sand content on the mechanical behavior of a low plasticity clay that collected from south of Iraq (Sumer town). Samples have been prepared with sand contents of 0%, 10%, 20%, 30%, and 40% of the clay weight. Standard Proctor and unconfined compression tests have been carried out and the optimum moisture content, maximum dry density, and undrained shear strength have been determined. The results show a gradual increasing trend of the maximum dry density with the increase of the sand content up to 30%. The highest dry density reaches 1.90 g/cm3 corresponding to an optimum moisture content of 12%. In addition, this paper shows that the undrained shear strength is inversely proportional to the increase of the percentage of sand. The results of this work provide a useful addition to the literature regarding the behaviour or low plasticity clay-sand mixture.

scholarly journals Experimental Research on Creep Characteristics of Nansha Soft Soil

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Qingzi Luo ◽  
Xiaoping Chen
Keyword(s):  
Pearl River Delta ◽  
Soft Soil ◽  
Creep Damage ◽  
Pearl River ◽  
Test Results ◽  
Creep Failure ◽  
Consolidation Pressure ◽  
Creep Characteristics ◽  
Triaxial Creep ◽  
Shear Box

A series of tests were performed to investigate the creep characteristics of soil in interactive marine and terrestrial deposit of Pearl River Delta. The secondary consolidation test results show that the influence of consolidation pressure on coefficient of secondary consolidation is conditional, which is decided by the consolidation state. The ratio of coefficient of secondary consolidation and coefficient of compressibilityCa/Ccis almost a constant, and the value is 0.03. In the shear-box test, the direct sheer creep failure of soil is mainly controlled by shear stress rather than the accumulation of shear strain. The triaxial creep features are closely associated with the drainage conditions, and consolidation can weaken the effect of creep. When the soft soil has triaxial creep damage, the strain rate will increase sharply.

Experimental Study on the Effects of Internal Erosion on the Physical and Mechanical Properties of Tailings Under Unsteady Seepage

2021 ◽  
Author(s):  
Rong Gui ◽  
Guicheng He
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Shear Strength ◽  
Average Particle Size ◽  
Physical And Mechanical Properties ◽  
Internal Erosion ◽  
Average Particle ◽  
Sand Column ◽  
Sedimentary Characteristics ◽  
Seepage Erosion

Abstract In this paper, the hydraulic sedimentary model was established to investigate the effects of dry beach slope on the sedimentary characteristics of tailings, and the sand column model was built to investigate the effects of seepage erosion on the physical and mechanical properties of sedimentary tailings under unsteady seepage.The results show that the slope of dry beach have a great effect on the sedimentary characteristics of tailings, the average particle size of tailings decreases along the slope of dry beach, and the larger the slope, the more obvious the stratification of the tailings. The migration of fine-grained tailings caused by seepage erosion increases the permeability of the tailings and reduces the shear strength of the tailings. After seepage erosion,the average particle size of 1#tailings sample, 2#tailings sample and 3#tailings sample increased by 6.4%, 12.0% and 2.4% respectively, the hydraulic conductivity of 1# tailings sample, 2# tailings sample and 3# tailings increased by 27.2%,17.9%, and 15.3% respectively after internal erosion, and the shear strength of 1#tailings sample, 2#tailings sample and 3#tailings sample tailings sample decreased by 20.9 %, 15.1% and 12.4% respectively.

Characterisation of Residual Shear Strength at the Sheringham Shoal Offshore Wind Farm

2014 ◽  
Author(s):  
Thi Minh Hue Le ◽  
Gudmund Reidar Eiksund ◽  
Pål Johannes Strøm
Keyword(s):  
Shear Strength ◽  
Wind Farm ◽  
Offshore Wind ◽  
Interface Shear ◽  
Residual Shear Strength ◽  
Axial Capacity ◽  
Ring Shear ◽  
Stiff Clay ◽  
Soil Units ◽  
Shear Box

For offshore foundations, the residual shear strength is an important soil parameter for the evaluation of installation resistance and axial pile capacity (for jacket foundation). Estimation of residual shear strength can be conducted in a shear box test in the conventional way, or with the introduction of an interface to evaluate the change in residual shear strength under influence of friction between soil and the interface. In addition, the residual effective friction angle can be measured in the ring shear test using the Bromhead apparatus. In this study, the three above-mentioned methods are employed to estimate the values of residual shear strength of two soil units: the Swarte Bank Formation and the Chalk Unit sampled from the Sheringham Shoal offshore wind farms. The Swarte Bank Formation is dominated by heavily over-consolidated stiff clay, while the Chalk Unit is characterized by putty white chalk which behaves in a similar manner to stiff clay if weathered, or to soft rock if unweathered. These soil units are located at the bottom of the soil profile at the Sheringham Shoal wind farm and hence are important in providing axial capacity to the foundation. Samples from the two soil units are tested and compared at different rates of shearing to evaluate the change in axial capacity and installation resistance of the offshore wind turbine foundations under various possible loading and drainage conditions. Comparison is also made between residual shear strength with and without a reconsolidation period to assess the potential for soil set-up and its influence on the soil capacity. The results show that, for both the clay and the chalk, the estimated residual shear strengths are quite similar between the conventional and interface shear tests and tend to increase with increasing shearing rate. This can be attributed to the increasing dominance of the turbulent shearing mode. Relative to the peak shear strength, the values of residual shear strength are approximately 5 to 35% lower in most cases. Reconsolidation for a period of 24 hours appears to have, if any, marginal positive effect on residual shear strength of the two soils in both shear box and interface shear box tests. The residual friction angles derived from the shear box and ring shear tests are comparable and fall in the immediate range of shear strength. The various test results imply that the pile foundations at the Sheringham Shoal would have considerably large axial capacity, assuming that the horizontal stress is similar to the normal stress used in testing. The test data however should be used with caution and combined with piling experience in comparable soils where possible. The study aims to provide a source of reference for design of pile foundations for sites with similar soil conditions.

The Effect of Heat Induction on Shear Strength of Soft Soil in Radial Zone

2020 ◽  
Vol 998 ◽  
pp. 329-334
Author(s):  
Maraden Panjaitan ◽  
Lawalenna Samang ◽  
Achmad Bakri Muhiddin ◽  
Tri Harianto
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Soft Soil ◽  
Soft Clay ◽  
Experimental Result ◽  
Small Scale ◽  
Infrastructure Development ◽  
Heat Induction ◽  
Vane Shear Test ◽  
Radial Zone

The main problem in infrastructure development at the soft clay was its bearing capacity therefore it needs to be improved. In this research, the improvement method was carried out by modeling in small scale of preloading and heat induction combination. Location of soft clay sampling was in Takalar, Indonesia. The purpose of this study was to investigate the change of the shear strength of soft soil corresponding with heat induction at the radial zone. The shear strength was obtained by vane shear test and compressive strength from unconfined compressive test (UCT). The heat applied ranging from 100o C, 200o C, 300o C, and 400o C with static preloading load 0.20 kg/cm2. The strengths of the soil in radial zones have been tested at R0, R1, and R2. At lowest temperature 100° at R0 the compressive strength was 0.203 kg/cm2, at highest temperature 400° at R0 the compressive strength 0.467 kg/cm2, there was a significant increasing of compressive strength value with the change of temperature. At the highest temperature 4000 the shear strength from vane shear tests resulting at R0 0.240 kg/cm2, R1 of 0.128 kg/cm2, R2 of 0.077 kg/cm2. At the lowest temperature of 100o C shows R0 at 0.116 kg/cm2, R1 at 0.070 kg/cm2, R3 of 0.046 kg/cm2. The results show a tendency of declining strength value as the soil farther away from center of heat induction. The experimental result from this model produces strength that can be used as a parameter of the foundation model on soft soil.

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