Axial force–displacement behaviour of a buried pipeline in saturated and unsaturated sand

Géotechnique ◽  
2019 ◽  
Vol 69 (11) ◽  
pp. 986-1003 ◽  
Author(s):  
Mohammed Al-Khazaali ◽  
Sai K. Vanapalli
Keyword(s):  
Axial Force ◽  
Buried Pipeline ◽  
Unsaturated Sand ◽  
Force Displacement

Numerical Analysis of Floatation Response of Buried Pipeline in Liquefied Soil

2014 ◽  
Vol 580-583 ◽  
pp. 791-796
Author(s):  
Su Nan Deng ◽  
Wen Tao Peng ◽  
Jun Qi Lin
Keyword(s):  
Numerical Analysis ◽  
Elastic Foundation ◽  
Axial Force ◽  
Soil Property ◽  
Soil Liquefaction ◽  
Influential Factors ◽  
Beam Model ◽  
Buried Pipeline ◽  
Calculation Results ◽  
Homogeneous Soil

In this paper, the formulae are deduced for the floatation response of pipeline buried in liquefied soil. The beam model based on the theory of beam on elastic foundation is used for the pipeline buried in non-liquefied and liquefied soil. The soil property is nonlinear, the floating force induced by the soil liquefaction is related to the position of pipeline, is nonlinear also. For the convenience and simplification of analysis, the nonlinear increment element method was used and lots of numerical analysis was conducted, including: the floatation response of pipeline buried in homogeneous soil, the floatation response of pipeline buried in non-homogeneous soil, and the floatation response of pipeline buried in discontinuous liquefied area. The influential factors on the floatation response of buried pipeline buried in liquefied soil including spring stiff of liquefied soil, the initial deformation, the length of liquefied area, the axial force acting on the pipeline, the material of pipeline, and the diameter of pipeline. The calculation results of discontinuous liquefied area draw a significant conclusion that for a long liquefied area, to make the soil non-liquefied in the middle of liquefied area may decrease the length of liquefied area and reduce the flotation displacement of pipeline greatly.

Study on Buried Pipeline Floatation Response Induced by Soil Liquefaction

2014 ◽  
Vol 608-609 ◽  
pp. 820-824
Author(s):  
Su Nan Deng ◽  
Wen Tao Peng ◽  
Jun Qi Lin
Keyword(s):  
Elastic Foundation ◽  
Axial Force ◽  
Virtual Work ◽  
Soil Liquefaction ◽  
Initial Deformation ◽  
Beam Model ◽  
Buried Pipeline ◽  
Beam On Elastic Foundation ◽  
Model Based ◽  
Element Method

On the basis of Virtual Work, in this paper, the formulae are deduced for the floatation response of buried pipeline duo to the soil liquefaction. A beam model based on the theory of beam on elastic foundation is used for the pipeline buried in non-liquefied and liquefied area, considering the effects of nonlinear soil constraint and the initial deformation, the length of liquefied area, and the axial force acting on the pipeline. The study of floatation response of buried pipeline are conducted using the nonlinear increment element method, some results are given.

Instrumentation for Measurement of Lingual Strength

1968 ◽  
Vol 11 (1) ◽  
pp. 189-193 ◽  
Author(s):  
Lois Joan Sanders
Keyword(s):  
Single Channel ◽  
Displacement Transducer ◽  
Tongue Pressure ◽  
Maximum Pressure ◽  
Research Use ◽  
Direct Writing ◽  
Significant Difference ◽  
Pressure Unit ◽  
Force Displacement ◽  
Consistent Response

A tongue pressure unit for measurement of lingual strength and patterns of tongue pressure is described. It consists of a force displacement transducer, a single channel, direct writing recording system, and a specially designed tongue pressure disk, head stabilizer, and pressure unit holder. Calibration with known weights indicated an essentially linear and consistent response. An evaluation of subject reliability in which 17 young adults were tested on two occasions revealed no significant difference in maximum pressure exerted during the two test trials. Suggestions for clinical and research use of the instrumentation are noted.

Development of the mathematical model for assessing the optimal measurement step when surveying the depth of the underground pipeline from the ground

2020 ◽  
Vol 10 (4) ◽  
pp. 364-371
Author(s):  
Ruslan V. Aginey ◽  
◽  
Rustem R. Islamov ◽  
Alexey A. Firstov ◽  
Elmira A. Mamedova ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Survey Data ◽  
Ground Surface ◽  
Maximum Error ◽  
Large Error ◽  
Bending Stress ◽  
Buried Pipeline ◽  
Optimal Measurement ◽  
Pipeline Section ◽  
Bending Stresses

Existing methods for estimating the bending stresses of buried pipeline section based on the survey data for the depth of the axis of the pipeline from the ground surface are characterized by a large error between the real values of the bending stress and the values of the bending stress obtained from the calculation results based on the survey data. The purpose of this study is to improve the methodology for calculating the bending stresses of buried pipeline section based on the results of determining the depth of the axis of the pipeline from the ground surface, taking into account the design features of the pipeline and the used search equipment. Mathematical models are proposed that allow for the set value of the maximum error in determining bending stresses for a particular pipeline to choose the optimal measurement step before the survey, which will allow to reduce the error. Explanations are given on the choice of the maximum step of the study based on the strength characteristics of the pipeline. A calculation is provided that confirms the adequacy of the developed mathematical models and the possibility of their application in practice.

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