Deformation Characteristics Research on Gravel Bed for Deep Buried Immerse Tunnel

2013 ◽  
Vol 353-356 ◽  
pp. 1480-1483 ◽  
Author(s):  
Yong Wang ◽  
Cai Hong Sun
Keyword(s):  
Particle Size ◽  
Bearing Capacity ◽  
Pile Foundation ◽  
Compression Modulus ◽  
Ultimate Bearing Capacity ◽  
Physical Model Test ◽  
Deformation Characteristics ◽  
Small Particle Size ◽  
Gravel Bed ◽  
Particle Size Gradation

Taking some deep buried immerse tunnel as background, deformation characteristics of foundation gravel bed is discussed by physical model test. The results show that small particle size gradation is not suitable for the foundation gravel bed, and compared with the non-groove gravel, compression modulus is greatly reduced in case of gravel with groove, and in case of pile foundation, gravel crushing phenomenon is obvious at the end of loading, and the ultimate bearing capacity of gravel bed is about 480kPa. If pile and gravel bed are used as the immerse tunnel foundation plan, it needs to take measure to control the stress level under the ultimate bearing capacity of gravel bed.

scholarly journals Calculation of Ultimate Bearing Capacity of Pile Foundations of Highway Bridges under the Coupling of Steep Slope and Karst

2020 ◽  
Vol 198 ◽  
pp. 02017
Author(s):  
Zhongju Feng ◽  
Shaofen Bai ◽  
Wu Min ◽  
Jingbin He ◽  
Zhouyi Huang ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Highway Bridges ◽  
Ultimate Bearing Capacity ◽  
Steep Slope ◽  
Karst Area ◽  
Correction Coefficient ◽  
Finite Element Software ◽  
Calculation Results ◽  
Vertical Bearing

In order to study the influence of steep slope-karst coupling on the vertical bearing characteristics of pile foundation, the orthogonal simulation tests of pile foundation under 4 different roof thickness and 5 different slope are carried out by using Marc finite element software, and the correction coefficient of vertical partial bearing capacity of pile foundation according to roof thickness and slope is put forward. The test results show that when the thickness of the roof is more than 3 times the pile diameter, the ultimate bearing capacity of the pile foundation tends to be stable, and the value is about 19% when the slope is 45°; the ultimate bearing capacity of the pile foundation decreases gradually with the increase of the slope, and the reduction reaches 29.83% when the slope is greater than 45°. According to the calculation results, the variation law of vertical partial bearing capacity of pile foundation is analyzed, and the calculation formula of standard value of vertical ultimate bearing capacity of pile foundation in steep slope karst area considering both roof thickness and slope is put forward, and the correction coefficients αi and β are put forward.

scholarly journals Damage Analysis and Experimental Study of Composite Structures with Initial Delamination

2019 ◽  
Vol 37 (4) ◽  
pp. 730-736
Author(s):  
Zhikai Wang ◽  
Zhipeng Chen ◽  
Nana Yang ◽  
Tao Yang
Keyword(s):  
Composite Materials ◽  
Bearing Capacity ◽  
Composite Laminates ◽  
Composite Structures ◽  
Load Capacity ◽  
Compression Modulus ◽  
Ultimate Bearing Capacity ◽  
Effective Length ◽  
Linear Segment ◽  
Two Parameters

Composite laminates are prone to delamination during hot pressing and cooling, this delamination is one of the most important defects that affect the properties of composite structures, the formation and propagation of delamination in composite materials can significantly reduce the structural strength of composite materials and even lead to catastrophic failure. In this paper, the two parameters of the initial stratified position and the initial stratified diameter are selected to research the effects of these two parameters on the mechanical properties of composite laminates through numerical simulation and experiment, and concludes that the influence of initial delamination along the thickness direction on the average compression modulus and strain of the linear segment is small; the influence of delamination on the ultimate bearing capacity increases with the decrease of the distance between the delamination and the center plane. When the diameter of the delamination is in the range of 8%~20% of the effective area(18~44 mm), the influence on the average compression modulus, ultimate bearing capacity and strain of the linear segment is not obvious. When the diameter is increased to 27% of the effective length(60 mm), the above properties have changed greatly. And then, this paper introduces the bilinear controlled cohesive elements into the progressive failure method to calculate the ultimate load capacity of composite laminates, and demonstrate the accuracy of the simulation method by experiments.

scholarly journals KOMPARASI KINERJA ALAT PILE DRIVING ANALYZER DAN SOFTWARE CAPWAP DALAM MENGHASILKAN DAYA DUKUNG ULTIMIT PONDASI TIANG

2020 ◽  
Vol 28 (3) ◽  
pp. 378
Author(s):  
Rasdinanta Tarigan
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Soft Soil ◽  
Performance Comparison ◽  
Ultimate Bearing Capacity ◽  
Pile Foundations ◽  
Pile Driving ◽  
Analysis Program ◽  
Wave Analysis ◽  
The Difference

Buildings that stand on soft soil usually use a pile foundation. Testing the ultimate bearing capacity of pile foundations in the field is a Pile Driving Analyzer (PDA) tool. Besides being inexpensive to test, the results can also be known quickly. This tool is supported by a software called CAPWAP (CAse Pile Wave Analysis Program).In this paper, a performance comparison of the Pile Driving Analyzer (PDA) and CAPWAP (CAse Pile Wave Analysis Program) software will be presented in producing the ultimate bearing capacity of pile foundations. The results of both will be analyzed in such a way that the causes of the differences in the performance of the Pile Driving Analyzer (PDA) and the CAPWAP software are known.The results obtained show that the performance of the Pile Driving Analyzer (PDA) tool will not be optimal if the energy transferred to the pile foundation is too small. The energy given by the hammer when struck must be in the range of 1% - 2%, if it is smaller then the performance of the tool in producing the ultimate bearing capacity will not be representative. The difference in the ultimate bearing capacity between the PDA device and the CAPWAP software for energy transferred to the pile foundation (EMX) under the specified energy standard is 10.71% - 33.23%. Meanwhile, energy that meets the specified standards has a value between 0.24% - 1.80%.

scholarly journals Model Test Ultimate Bearing Capacity of Bakau Piles Foundation on Soft Soil Deposit

2018 ◽  
Vol 1 (2) ◽  
pp. 94-99
Author(s):  
Muhammad O Yunus
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Soft Soil ◽  
Ultimate Bearing Capacity ◽  
Small Scale ◽  
Test Results ◽  
Loading Test ◽  
Deep Foundation ◽  
Foundation Model ◽  
Ultimate Settlement

The pile foundation is one of the deep foundation types commonly used to support building loads when hard soil layers are deeply located. To determine the ultimate bearing capacity of a pile foundation of the load test results, there are several methods commonly used to interpretation test results such as Davisson method, Mazurkiewich method, Chin method, Buttler Hoy method and De Beer method. The aim of this study was to determine the characteristics of soft soil and bakau piles used in the study and to analyze the size of the bearing capacity ultimate of pile foundation that is modeled on a small scale in the laboratory. From the test results of material characteristics of the soil used is organic clay type with medium plasticity with specific gravity 2.75, liquid limit, LL = 50.36% and plasticity index, PI = 13.2%. While the results of testing the characteristics of bakau piles obtained average water content of 21.58%, tensile strength of 18.51 MPa, compressive strength of parallel fiber 23.75 MPa and perpendicular fiber 14.10 MPa, bending strength 106, 22 MPa, and strong split 29.91 MPa. From the result of loading test of the foundation model in the laboratory, it is found that the ultimate bearing capacity of the model without foundation is 41.00 kN with the ultimate settlement of 14.00 mm, the model of the 20 cm long bakau piles foundation is 52.00 kN with the ultimate settlement of 13.00 mm, the foundation model a 30 cm long bakau piles foundation of 54.00 kN with a 10.00 mm ultimate settlement, a 40 cm long bakau piles foundation model of 56.00 kN with an ultimate settlement of 8.50 mm.

Research on Influence Factors of the Ultimate Bearing Capacity of the Soil of Push-Extend Multi-under-Reamed Pile under Compression

2013 ◽  
Vol 671-674 ◽  
pp. 538-541 ◽  
Author(s):  
Yong Mei Qian ◽  
Yan Yi ◽  
Ruo Zhu Wang
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Theoretical Basis ◽  
Influence Factors ◽  
Ultimate Bearing Capacity ◽  
Failure Behavior

In this paper, according to achievements about the failure behavior of soil around the Push-extended Multi-under-reamed Pile and the ultimate bearing capacity under compression, they are qualitative or quantitative analyzed that the variation factors affect the ultimate bearing capacity of the Push-extend Multi-under-reamed Pile, in order to further improve and revise the calculating formula for the ultimate bearing capacity of the Push-extend Multi-under-reamed Pile, and then to provide more reliable theoretical basis for the design of pile foundation.

scholarly journals Analysis of Bored Pile Foundation Bearing Capacity Based on Cone Penetration Test Data (Case Study: Cilellang Weir Location)

2021 ◽  
Vol 8 (1) ◽  
pp. 30
Author(s):  
Indra Mutiara
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Cone Penetration Test ◽  
Ultimate Bearing Capacity ◽  
Deep Foundations ◽  
Penetration Test ◽  
Cone Penetration ◽  
Bored Pile ◽  
Method Show

The use of a bored pile foundation is an alternative in planning deep foundations. The function of this bored pile foundation is more or less the same as other deep foundations such as piles but has a slight difference in the process. The bored pile foundation begins with drilling the ground to the planned depth, followed by the installation of steel reinforcement and then concrete mortar. This study aims to evaluate the Cone Penetration Test (CPT) data on the bearing capacity of the bored pile foundation. Calculation of bearing capacity from Cone Penetration Test (CPT) data using the Schmertmann & Nottingham method and the Mayerhof method. Based on CPT data, the percentage calculation of ultimate bearing capacity at location S1 with the Schmertmann & Nottingham method is more optimistic ±17.28% compared to using the Mayerhof method for bored pile diameters of 60 and 80 cm, while for bored pile diameters of 40 cm, calculations using the Mayerhof method show more optimistic by 21.89%. The percentage calculation of ultimate bearing capacity at location S2 using the Schmertmann & Nottingham method is ±11.66% more optimistic than using the Mayerhof method for bored pile diameters of 60 and 80 cm, while the diameter of the bored pile 40 cm, the calculation using the Mayerhof method shows a more optimistic result of 33.82%.

The Research of Impact in Pipe Pile Squeezing Soil to Bearing Capacity of the Pile

2011 ◽  
Vol 291-294 ◽  
pp. 3424-3428
Author(s):  
Jin Xu ◽  
Jing He
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Ultimate Bearing Capacity ◽  
Pipe Pile ◽  
Design And Construction

This paper are doing responsive and exploratory test of the pile bearing capacity for squeezing soil. In order to provide the basis for determining the ultimate bearing capacity of the pile foundation for the design and construction units.

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