Effect of Dynamic Compaction on Red Sand Soil Filling Embankment

2012 ◽  
Vol 268-270 ◽  
pp. 788-791
Author(s):  
Chong Chen
Keyword(s):  
Bearing Capacity ◽  
Water Content ◽  
Dynamic Compaction ◽  
Sand Soil ◽  
Work Done

Abstract: The scheme and implement of dynamic compaction on red sand soil embankment, Ying(tan)-Rui(jin) expressway, is introduced in this study. The settlement of the subgrade in the field was observed. The density and the water content of it were tested. Then bearing capacity of the subgrade was detected by PFWD. All the work done is to analyze the effect of dynamic compaction on the red sand soil roadbed. It shows that the water content decreases while the strength increases with compaction. That is, the embankment is compacted effectively by dynamic compaction.

scholarly journals Bearing Capacity Analysis of Bridge Foundation Based on Cone Penetration Test Data and Soil Parameters Data

2019 ◽  
Vol 19 (3) ◽  
pp. 145
Author(s):  
Muhammad Yunus ◽  
Zahrin F. Syahdinar
Keyword(s):  
Specific Gravity ◽  
Bearing Capacity ◽  
Water Content ◽  
Liquid Limit ◽  
Soil Parameters ◽  
Bridge Structure ◽  
Cone Penetration ◽  
Sand Soil ◽  
Cone Penetration Testing ◽  
Allowable Bearing Capacity

One that deserves the attention of planners in designing a bridge structure is the design of the substructure. This is due to the fact that the structure below determines the quality and service life of a bridge and at present many cases of bridge structure failures are caused by failures of the substructure in holding the load acting on the bridge The aim of this research to test the characteristics of the soil and calculate bearing capacity of the foundation based cone penetration testing data and soil parameters at the Aifa bridge construction field in Fafurwar District, Teluk Bintuni Regency, West Papua Province. From the results of testing the soil characteristics in the laboratory, the type of soil at point 1 is the type of good to bad graded sand soil (SW-SP) with a water content of 17.72%, specific gravity 2.98, liquid limit (LL) = 16,746% included in the non-plastic category. While the location of point 2 is obtained from good to bad graded sand soil type (SW-SP) with a water content of 28.52%, specific gravity 2.73, liquid limit (LL) = 16.746% including the non-plastic category. To analysis of the calculation of the bearing capacity of the foundation Aifa bridge using data from the sondir test results for point 1 was obtained allowable bearing capacity (Qall) is 4.610,44 kN and for point 2 was obtained allowable bearing capacity (Qall) is 3.598,43 kN. For calculating bearing capacity of the foundation using soil parameter data for point 1 was obtained bearing capacity allowable (Qall) is 2.209,93 kN and for point 2 was obtained allowable bearing capacity (Qall) is 655,41 kN

scholarly journals A method of calculating the bearing capacity of sand pile composite foundations in a mucky soil layer considering consolidation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yongtao Zhang ◽  
Yuqing Liu ◽  
Huiwu Luo ◽  
Peishuai Chen ◽  
Dejie Li ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Water Content ◽  
Effective Stress ◽  
Void Ratio ◽  
Soil Layer ◽  
Composite Foundation ◽  
Engineering Practice ◽  
Application Process ◽  
Sand Pile ◽  
Cavity Expansion Theory

AbstractIn engineering practice, the measured bearing capacity of a sand pile composite foundation in a mucky soil layer is much larger than the design value. Based on the sand pile construction and the load application process, a method of calculating the bearing capacity of the foundation based on the effective stress was proposed. Cavity diameter expansion in sand pile construction was simplified into a planar problem, and the cavity expansion theory was used to establish the expression of the rate of displacement and the horizontal stress increase. Based on the e–p curve and the calculation of the degree of consolidation, the relationships between the horizontal and vertical effective stress and the void ratio were obtained. According to the close relationship between the bearing capacity of the foundation in a mucky soil layer and the water content, an expression describing the relationships between the bearing capacity of the foundation, effective stress, void ratio, and water content was established. For the temporary engineering foundation treatment project, which needs a high bearing capacity but allows large foundation deformation, the design of sand pile composite foundations uses these relationships to take the consolidation effect of mucky soil into consideration, thereby reducing the replacement rate and lowering the construction cost.

Test Study on Effective Reinforcement Depth of Dynamic Compaction and Filling Replacement

2011 ◽  
Vol 368-373 ◽  
pp. 2550-2553 ◽  
Author(s):  
Wei Li ◽  
Chun Xiao Zhang ◽  
Peng Xiang Sun
Keyword(s):  
Bearing Capacity ◽  
Low Cost ◽  
Soft Soil ◽  
Dynamic Compaction ◽  
Reinforcement Effect ◽  
Large Area ◽  
Remarkable Effect ◽  
Ground Treatment ◽  
Test Study ◽  
Effective Reinforcement

Filling replacement combined with dynamic compaction is a very effective method to preprocess the soft soil to obtain larger bearing capacity. That not only has remarkable effect to improve soil bearing capacity, but also has some advantages, such as quick construction, simple equipment, low cost and so on. And that is appropriate for large area ground treatment engineering. The purpose of ensuring the reinforcement effect and saving the project cost, and providing references for the similar projects can be achieved through the test study on effective reinforcement depth of dynamic compaction and filling replacement.

scholarly journals Effect of soil moisture content on the bearing capacity of small bored piles in the unsaturated soil of Maringá, Paraná, Brazil

2021 ◽  
Vol 337 ◽  
pp. 03006
Author(s):  
Verônica Ricken Marques ◽  
Antonio Belincanta ◽  
Mary-Antonette Beroya-Eitner ◽  
Jorge Luis Almada Augusto ◽  
Ewerton Guelssi ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Bearing Capacity ◽  
Water Content ◽  
Unsaturated Soil ◽  
Soil Layer ◽  
Matric Suction ◽  
Load Test ◽  
Degree Of Saturation ◽  
Static Load Test

In this study, the influence of soil moisture on the bearing capacity of piles founded in an unsaturated clay soil was investigated. The soil studied, composing the upper soil layer in Maringá, Brazil, is lateritic, has degree of saturation between 37% and 70% and has collapsible behaviour when wet. The bearing capacity was determined by full-scale load tests following the Brazilian Standard for Static Load Test. Two pile lengths, 4 m and 8 m, were considered. To analyse the influence of soil moisture, two tests were performed for each pile length: one in soil in its natural moisture content and another in pre-moistened soil. Results show that for both pile lengths, an increase in water content caused a significant reduction in bearing capacity, which is attributed to the decrease in the matric suction of the soil. This is confirmed by the results of the initial evaluation made on the variation of matric suction and its contribution to the bearing capacity with changes in water content. In summary, this study confirms that the pile bearing capacity in unsaturated soil is dependent on soil water content, highlighting the fact that the approach of assuming full saturation condition in the evaluation of the pile bearing capacity in such soil may give erroneous results. Moreover, this study demonstrate that the empirical methods most commonly used in Brazil for pile bearing capacity determination, the Décourt & Quaresma and Aoki & Velloso methods, are overly conservative when applied to the Maringá soil.

scholarly journals PENGARUH KEMIRINGAN FONDASI TIANG PANCANG BATTERED PILE PADA TANAH LEMPUNG DAN TANAH PASIR

2020 ◽  
Vol 3 (2) ◽  
pp. 467
Author(s):  
Swendrinata Suwardi ◽  
Andryan Suhendra
Keyword(s):  
Ground Water ◽  
Bearing Capacity ◽  
Carrying Capacity ◽  
Clay Soil ◽  
Soil Conditions ◽  
Sand Soil ◽  
Lateral Capacity ◽  
Pile Up ◽  
Calculation Results ◽  
Curve Method

The Battered Pile  is one of the foundation designs that aims to increase the lateral bearing capacity of the foundation. Battered Pile are designed with a certain slope that aims to increase the lateral capacity of the soil. The type of soil used will affect the lateral capacity of the pole. Calculation of bearing capacity of the pile is carried out on the condition of clay and sand soils at slope 00 to +200. The calculation results will then be analyzed to understand the effects that occur. The calculation results will be presented in the p-y curve method. The use of this method is expected to make it easier to understand the characteristics of Battered Pile for soil conditions. Based on the analysis it was found that an increase in the  capacity of the pile up to 23% in the slope of 100 to 150. Sand soil in conditions below the surface of the ground water will have a linear carrying capacity and have a lower deflection value when compared to clay soil at a depth of 2 meters. But at a depth of 16 meters, clay has a point where it has a lower deflection value compared to sandy soil.AbstrakTiang pancang Battered Pile merupakan salah satu rekasaya fondasi yang bertujuan untuk meningkatkan daya dukung lateral fondasi. Tiang Battered Pile dipancang dengan kemiringan tertentu yang bertujuan untuk meningkatkan daya dukung lateral tanah. Jenis tanah yang digunakan akan mempengaruhi daya dukung lateral tiang. Perhitungan daya dukung tiang dilakukan pada kondisi tanah lempung dan tanah pasir pada kemiringan 00 hingga +200. Hasil perhitungan kemudian akan dianalisis untuk memahami pengaruh yang terjadi. Hasil perhitungan akan disajikan dalam metode p-y curve. Penggunaan metode ini diharapkan dapat memudahkan dalam memahami karakteristik tiang Battered Pile terhadap kondisi tanah. Berdasarkan analisis didapatkan bahwa terjadi peningkatan daya dukung tiang hingga 23% pada kemiringan 100 hingga 150. Tanah pasir pada kondisi di bawah permukaan air tanah akan mengalami kenaikan daya dukung secara linier  dan memiliki  nilai lendutan yang lebih kecil jika dibandingkan dengan tanah lempung pada kedalaman 2 meter. Tetapi pada kedalaman 16 meter, tanah lempung memiliki titik dimana memiliki nilai lendutan yang lebih kecil jika dibandingkan dengan tanah pasir.

Influence of Fouling and Water Content of Ballast on Railway Substructure Bearing Capacity

2017 ◽  
Author(s):  
A. K. Rohrman ◽  
H. F. Kashani ◽  
C. L. Ho
Keyword(s):  
Slope Stability ◽  
Bearing Capacity ◽  
Water Content ◽  
Strength Properties ◽  
Triaxial Tests ◽  
Repeated Loading ◽  
Layered System ◽  
Modes Of Failure ◽  
Track System ◽  
Track Substructure

The performance of ballasted railway systems is commonly compromised by the infiltration of fine material into the voids of the ballast. This sand and finer grained materials in the ballast is known as fouling. Increased fouling can cause decreases in hydraulic conductivity and shear strength of the ballast, as well as reduce stiffness and resilient modulus of the overall track system. These problems can cause gradual deterioration of the track, which could eventually require maintenance. One of the largest source of fouling comes from ballast breakdown resulting from abrasion caused under repeated loading. This study aims to investigate the effects of fouling from ballast breakdown on the bearing capacity of the substructure that supports the rail superstructure. Previous investigations at the University of Massachusetts Amherst utilized large scale 10-inch (25.4 cm) diameter triaxial tests on granitic ballast with fouling from ballast breakdown. The tests were run with fouling contents of 0% (clean ballast), 15%, and 30% and at water contents varying from dry ballast to field capacity. Confining pressures of 5 psi (34.5 kPa), 10 psi (68.9 kPa) and 15 psi (103.4 kPa) were used in this series of tests. Using the results from these tests, the Mohr-Coulomb strength properties can be determined for each case. This study will make use of the strength properties obtained from the results of these tests and apply them using two commonly used bearing capacity analyses. The first model is the Meyerhof and Hanna Method which considers the track as a continuous footing over a layered system. This model considers two modes of failure; punching of an individual sleeper, and track system bearing. The second model applied is the slope stability method, which uses a two-dimensional limit equilibrium approach and the method of slices to determine a factor of safety against slope stability. This analysis is commonly performed using various software programs. In this study, SLOPE/W from the GeoStudio software package is utilized for analysis. The factors of safety resulting from the bearing capacity analysis using these two methods will be compared for each of the test configurations performed, which will help to confirm the results of the analyses. Since the Mohr-Coulomb strength properties change with the degree of fouling and the water content of the ballast, it is expected that this will have some effect on the bearing capacity of the track substructure. The results of these analyses showing the effects of water content and fouling of ballast on overall track substructure bearing capacity are presented in this paper.

scholarly journals PENGARUH PENAMBAHAN SIRTU TERHADAP NILAI CBR SUBGRADE RUAS JALAN KOYA TENGAH DISTRIK MUARA TAMI KOTA JAYAPURA (QUARRY SIRTU HARAPAN KABUPATEN JAYAPURA)

2021 ◽  
Vol 2 (2) ◽  
pp. 10-22
Author(s):  
Alfian Adie Chandra
Keyword(s):  
Bearing Capacity ◽  
Water Content ◽  
Liquid Limit ◽  
Building Construction ◽  
Soil Functions ◽  
Plastic Limit ◽  
Cement Soil

The problem of the bearing capacity of the subgrade is one of the most important thingsconsidered in a planning and work of a civil building construction. This matterbecause the soil functions as a medium that withstands the load or action of the constructionbuilt on it. Changes in weather and temperature in the field are factors that makeunstable ground. Many stabilizations have been carried out using cement soil, howeverrequires no small cost and also the results of the implementation of the soil stabilizationrelatively short-lived. Therefore, this research was conducted using a mixture ofsirtu with mixed variations of 15%, 20% and 30%. More variety of mixThe added sirtu causes the water content to decrease which will make the power value decreasethe bearing capacity of the soil increases, the value of the plastic limit increases, while the value of the liquid limit and indexthe plasticity of the soil decreases.

scholarly journals THE INFLUENCE OF THE TAMPED OUT FOUNDATION ON THE CALCULABLE STRENGTH OF THE FOOTING BASE/PLŪKTINIO PAMATO FORMOS ĮTAKA PADO PAGRINDO SKAIČIUOJAMAJAM STIPRUMUI

2001 ◽  
Vol 7 (3) ◽  
pp. 197-200
Author(s):  
Antanas Alikonis
Keyword(s):  
Bearing Capacity ◽  
Experimental Research ◽  
Static Loading ◽  
Natural Soil ◽  
Sand Soil ◽  
Natural Sand ◽  
Cylindrical Form ◽  
Building Practice ◽  
Percentage Ratio ◽  
Truncated Pyramid

Foundations, erected in the tamped out trenches, are distinguished for a greater bearing capacity of the base in comparison with the foundations which are erected in the dug out trenches. They are also economic in respect of energy and material. The building practice shows that tamped out, that is erected in tamped out trenches, foundations can be successfully used in many types of soil. The tamped out foundation of the truncated pyramid form can bear the bigger part of the loading by its sides because of the leaning sides of the foundation and the foundation of the cylindrical form can bear for smaller part of the loading because its sides are perpendicular. The bearing capacity of the sides of the tamped out foundation is calculated using theoretical formulas which are rather complicated and it requires figure meaning of Geotechnical features of soil. The author investigated theoretically the distribution of the effecting strength between the bottom and the tamped out foundation. The strength whitch falls on the bottom of the foundation was used to define the calculable strength of the bottom of the foundation. According to the strength that falls on the bottom of the foundation the tension calculated when n=1,2,3% which in considered the calculable strength of the bottom of the foundation. The calculable strength of the bottom of the base of the foundation is connected with the conic strength of natural soil qc, which is got by statical serenading. The experiments were carried out in sand soils the conic strength of which was 4–6MPa. According to the results of the experimental research the formula was deduced to define the calculable strength of the bottom of the tamped out foundation of the truncated pyramid shape. The experiments were carried out trying static loading on 6 experimental foundations in sand soils the conic strength of which was 4–8MPa. During the experiment the calculable strength of the bottom of the tamped out foundation of the cylindrical form was investigated. Analyzing the results of these experiments the strength which falls on the bottom of the foundation was distinguished. The tension on the plane of the bottom of the foundation was defined according to the settlings of the foundation form loading. The settlings of the foundation in this situation was 1,2,3% of the foundation diameter. These tensions are considered the calculable strength of the base of the bottom of the foundation. According to the results of the experimental research the formula was deduced to define the calculable strength of the bottom of the tamped out foundation of the cylindrical form. This calculable strength was defined according to the natural sand soil conic strength and accepted ratio of settling and the diameter of the foundation. The results of the reseach show that the calculable strength of the bottom of the tamped out foundation of the cylindrical form which is erected in sand soils is much bigger that the calculable strength of the tamped out foundation of the truncated pyramid shape. The figure meaning of the calculable strength of the bottom of the base of the tamped out foundation depends on the form of the foundation, on the conic strength of the soil, which is got by statical sounding of natural soil and it depends on the accepted percentage ratio of the settling and the diameter of the foundation.

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