scholarly journals Analytical Solution for Estimating Bearing Capacity of a Closed Soil Plug: Verification Using An On-Site Static Pile Test

2020 ◽  
Vol 8 (7) ◽  
pp. 490 ◽  
Author(s):  
Suchun Yang ◽  
Junwei Liu ◽  
Ankit Garg ◽  
Mingyi Zhang
Keyword(s):  
Analytical Solution ◽  
Bearing Capacity ◽  
Pressure Sensor ◽  
Soil Layer ◽  
Penetration Test ◽  
Good Match ◽  
Soil Plug ◽  
Full Size ◽  
Pile Diameter ◽  
The Relationship

When the open-ended pile penetrates the soil layer, the resistance generated by the soil plug cannot be ignored. A pile with a full-size pressure sensor installed at pile tip can detect resistance more accurately than a microsensor when the pile penetrates into the soil. In this paper, the pile installed full-size pressure sensor was used for penetration test and the relationship between formation parameters and pile tip force is obtained. Using the solution of the Kelvin problem in infinite space and the plane stress distribution function, the analytical solution of the bearing capacity of the soil plug is derived under the condition that the displacements of the bottom of the pile and the soil plug are consistent. The results show that the ultimate stress of the soil plug is closely related to the pile diameter and pipe thickness. The bearing capacity of the soil plug is closely related to the properties of the soil layer. The analytical solution of the bearing capacity of the soil plug has a linear relationship with the formation parameters SPT and CPT. The analytical solution of the ultimate bearing capacity of the soil plug has been verified by field test data and has a good match with the geometric dimensions of the pile tip and the formation parameters.

Research on the Relationship between SPT and the Ultimate Vertical Bearing Capacity of Jacked Pile in Shenyang District

2011 ◽  
Vol 71-78 ◽  
pp. 3308-3311
Author(s):  
Xiang Ruan ◽  
Ren Yu Zuo
Keyword(s):  
Bearing Capacity ◽  
Empirical Formula ◽  
Standard Penetration Test ◽  
Penetration Test ◽  
Initial Stage ◽  
Engineering Requirement ◽  
Load Tests ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity ◽  
The Relationship

Though the wide applications of jacked pile in engineering in Shenyang district, the problem is also exist in engineering for the capacity of the jacked pile is hard to account. The relationship between the standard penetration test and the ultimate vertical bearing capacity of jacked pile is established in this paper; also an empirical formula is put forward for calculating the ultimate vertical bearing capacity of the jacked pile in this district with blow count of standard penetration test (SPT). The engineering examples indicated that the empirical formula is feasible because the calculating bearing capacity of the silent pipe pile is coincided with the static load tests. The calculated results satisfy the engineering requirement andt can be concluded that the method is also convenient to choose the diameter and length of the pile during the initial stage of design.

scholarly journals An Estimated Correlation between California Bearing Ratio (CBR) with some Soil Parameters of Gypseous Silty Sandy Soils

2020 ◽  
Vol 27 (1) ◽  
pp. 58-64
Author(s):  
Taha Abdulnabi ◽  
Zena Abdulrazzaq
Keyword(s):  
Soil Layer ◽  
Standard Penetration Test ◽  
California Bearing Ratio ◽  
Soil Parameters ◽  
Dry Density ◽  
Penetration Test ◽  
Maximum Dry Density ◽  
Material Content ◽  
Coarse Material ◽  
The Relationship

California Bearing Ratio (CBR) value represents the main soil characteristic factor for paving design of flexible pavements & paving of airport sites. It should be used to determine subgrade modulus of crust soil layer, by using certain correlations. It is a very important engineering parameter for soil condition for design of subgrade of flexible roads. CBR values of soil may be affected by other parameters, like maximum dry density (MDD) & optimum moisture content (OMC), soil types, (coarse material of gravel and sand content), etc. for un-soaked condition of samples. Evaluation of CBR in direct test is a time waste process. This case study was conducted to find out the relationship between CBR values with MDD, ‎OMC,‎ standard penetration test (SPT) and coarse material content of some soil samples collected from the investigated project during 2011 with approximate area about (30) Km2, with Latitude (32.319810o -32.412226o) and Longitude (44.144141o – 44.243775o). A statistical method was used for estimating the relationship between the CBR and MDD, OMC, standard penetration test (SPT) and coarse material content of the soil desiring to obtain a relationship and a formula combining the previous two variables. A reasonable relationship represented by first degree formula was obtained. On the other hand, the time and efforts will be minimized in estimation of CBR instead of the used processing to determine the soil parameter‎.

scholarly journals Kunst og naturvidenskab under samme tag

1970 ◽  
pp. 115
Author(s):  
Mette Kia Krabbe Meyer ◽  
Hanne Teglhus
Keyword(s):  
Aesthetic Experience ◽  
17Th Century ◽  
Art And Science ◽  
Work Of Art ◽  
Full Size ◽  
Disciplinary Boundaries ◽  
American Artist ◽  
Size Model ◽  
The Relationship

Kollokvium om at udstille kunst og naturvidenskab. Steno Museet, Danmarks Videnskabshistoriske Museum, Århus, 25. september 2006. In the fall of 2006, the Steno Museum (Aarhus, Denmark) exhibited the installation Room One created by the American artist Rosamond Purcell. This installation consists of a full-size model of Museum Wormianum, the Danish physician Ole Worm’s curiosity cabinet, dating from the 17th century. This is a work of art – yet it depicts a naturalist’s laboratory. When one adds that it has also been called the first museum in Denmark, it seemed an obvious step to make the artwork the occasion of a symposium on the relationship between art, science and museums. At this symposium, the artist, along with a number of science historians and museum curators, discussed the definitions of art and science then and now, and spoke about the attempts to transcend the disciplinary boundaries that take place within the museums. Different ways of exhibiting were brought into focus, and Purcell’s installation formed the basis for many interesting discussions about the museum as a place of learning and of aesthetic experience.

scholarly journals Settlement and bearingcapacity of long pile

Vestnik MGSU ◽  
2015 ◽  
pp. 52-61
Author(s):  
Armen Zavenovich Ter-Martirosyan ◽  
Zaven Grigor’evich Ter-Martirosyan ◽  
Tuan Viet Trinh ◽  
Ivan Nikolaevich Luzin
Keyword(s):  
Analytical Solution ◽  
Bearing Capacity ◽  
Quantitative Estimation ◽  
Pile Head ◽  
Dead Load ◽  
Rigid Pile ◽  
Side Face ◽  
Pile Settlement ◽  
General Force ◽  
Surrounding Soil

When a long pile is interacting with the soil, the combined force applied to the pile head is distributed among the side face and the pile toe inhomogeneously. The toe gets not more than 30 % from the general force, which doesn’t let using the reserves of the bearing capacity of relatively firm soil under the fifth pile. Account for the depth of the pile toe and the dead load of the soil allows increasing the bearing capacity of the soil under the pile toe and decrease the pile settlement in general. For the quantitative estimation of these factors it is necessary to solve the task on the interaction of the rigid long pile with the surrounding soil, which includes under the pile toe, which is absolutely rigid round stamp.The article presents the formulation and analytical solution to a quantification of the settlement of a circular foundation with the due account for its depth, basing on the development of P. Mindlin’s studies as well as the interactions between a long rigid pile and surrounding soils, including under pile toe.It is proposed to compare the estimated value of stresses under the heel of pile with the initial critical load for the round foundation to check the condition that the estinated value is less than the intial critical one.

Model Test of Bearing Capacity of WasteTire Assembly Foundation on Soft Soil Layer

2021 ◽  
Vol 69 (7) ◽  
pp. 263-269
Author(s):  
Me ti ◽  
Tri Harianto ◽  
Abdul Rachman Djamaluddin ◽  
Achmad Bakri Muhiddin
Keyword(s):  
Bearing Capacity ◽  
Model Test ◽  
Soft Soil ◽  
Soil Layer

scholarly journals A Full-Scale Experimental Study of the Vertical Dynamic and Static Behavior of the Pier-Cap-Pile System

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Jianlei Liu ◽  
Meng Ma ◽  
Flavio Stochino
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Dynamic Stiffness ◽  
Soil Layer ◽  
Low Frequency ◽  
Full Scale ◽  
Single Pile ◽  
Static Stiffness ◽  
Loading Test ◽  
Test Technique

The bearing capacity evaluation of bridge substructures is difficult as the static loading test (SLT) cannot be employed for the bridges in services. As a type of dynamic nondestructive test technique, the dynamic transient response method (TRM) could be employed to estimate the vertical bearing capacity when the relationship between static stiffness and dynamic stiffness is known. The TRM is usually employed to evaluate single piles. For the pier-cap-pile system, its applicability should be investigated. In the present study, a novel full-scale experimental study, including both TRM test and SLT, was performed on an abandoned bridge pier with grouped pile foundation. The test included three steps: firstly, testing the intact pier-cap-pile system; then, cutting off the pier and testing the cap-pile system; finally, cutting off the cap and testing the single pile. The TRM test was repeatedly performed in the above three steps, whereas the SLT was only performed on the cap-pile system. Based on the experimental results, the ratio of dynamic and static stiffness of the cap-pile system was obtained. The results show that (1) in the low-frequency range (between 10 and 30 Hz in this study), the dynamic stiffness of the whole system is approximately four times of that of a single pile; (2) the ratio of dynamic and static stiffness of the cap-pile system tested in the study is approximately 1.74, which was similar to other tested values of a single pile; (3) to evaluate the capacity of similar cap-pile system and with similar soil layer conditions by TRM, the value of Kd/Ks tested in the study can be used as a reference.

Effect of a Strong Middle Layer on Spudcan Penetration

2014 ◽  
Author(s):  
Wen Gao ◽  
Tom Harrup ◽  
Yuxia Hu ◽  
David White
Keyword(s):  
Bearing Capacity ◽  
Layer Thickness ◽  
Soft Clay ◽  
Soil Layer ◽  
Strength Ratio ◽  
Top Soil ◽  
Flow Mechanisms ◽  
Soil Flow ◽  
Jack Up ◽  
Peak Resistance

The rapid penetration of one or more of the foundations of a mobile jack-up rig into the seabed is an ongoing major problem in the offshore industry, with the potential to cause major damage to the structure and endangering any personnel on board. A recent example is the jack-up drilling rig Perro Negro 6 incident happened near the mouth of the Congo river in July 2013 with one of the rig’s crew of 103 reported missing and six others injured. This uncontrollable displacement is due to a form of failure known as punch through failure and commonly occurs on stratified seabed profiles. It has been reported that unexpected punch-through accidents have resulted in both rig damage and lost drilling time at a rate of 1 incident per annum with consequential costs estimated at between US$1 and US$10 million [1]. This paper presents the bearing capacity profiles and associated soil flow mechanisms of a common spudcan foundation penetrating into a three layer soft-stiff-soft clay soil through the use of large deformation finite element (LDFE) analysis. The Remeshing and Interpolation with Small Strain (RITSS) [2, 3] technique was implemented in the software package AFENA [4] to conduct the LDFE analysis. Both soil layer thickness and soil layer strength ratios were varied to study their effect on the spudcan penetration responses. The LDFE results of spudcan penetration into the soft-stiff-soft clay soils were calibrated by existing centrifuge test data. A parametric study was then conducted to study the bearing capacity responses and soil flow mechanisms during spudcan large penetrations by varying the soil layer strength ratio and relative layer thickness to the diameter of spudcan. It was found that there were three types of bearing responses during continuous penetration of spudcan: (a) when the top soft layer is relatively thin, the spudcan bearing response was similar to that of two layer soils with stiff over soft clays; (b) when the top soil layer thickness is medium, a peak resistance is observed when spudcan penetrates into the middle stiff layer followed by reduction; (c) when the soil layer is thick, the peak resistance occurs when spudcan gets into the bottom soft soil layer. The critical thickness of top soil layer is a function of soil strength ratio and middle stiff soil layer thickness. The bearing response types were also corresponding to the soil cavity formations during spudcan initial penetration.

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