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Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 147-168 doi: 10.1007/s11709-019-0587-6

Abstract: applicability of polyethylene fittings in joining polyethylene gas pipes which are electrofused onto the pipepolyethylene pipelines in the natural gas industry, can be imposed by sever loadings including the soil-structureinteraction, traffic load, soil’s column weight, internal pressure, and thermal loads resulting fromAdditionally, due to the application of pipe joints, and repair patches local stresses superimposed onThe maximum stress values in fitting and pipe are below the allowable stresses which shows the proper

Keywords： software     polyethylene     buried pipelines     polyethylene joints     polyethylene patches     peak von Mises stress     soil-pipeinteraction     temperature variation    

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Assessment of glass fiber-reinforced polyester pipe powder in soil improvement

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 742-753 doi: 10.1007/s11709-021-0732-x

Abstract: This study investigates the use of glass fiber-reinforced polyester (GRP) pipe powder (PP) for improvingThen, using the optimum PP addition, the bearing capacity of the soil was estimated through a seriesThe bearing capacity of sandy soil was improved by up to 30.7%.The ratio of the depth of the PP-reinforced soil to the diameter of the foundation model (H/D) of 1.25 could sufficiently strengthen sandy soil when the optimum PP ratio was used.

Keywords： shallow foundation     sandy soil     bearing capacity     soil improvement     pipe powder    

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Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions

Frontiers of Structural and Civil Engineering   Pages 915-934 doi: 10.1007/s11709-023-0907-8

Abstract: A fictitious soil pile (FSP) model is developed to simulate the behavior of pipe piles with soil plugsThe developed model simulates the base soil with a fictitious hollow pile fully filled with a soil plugand soil plug is considered.the predictions of the proposed model and conventional numerical models, as well as measurements for pipepipe pile toe, and some guidance is provided for the selection of the model parameters.

Keywords： fictitious soil pile     soil plug     pipe piles     high-strain dynamic analysis     one-dimensional wave theory    

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Soil-water interaction in unsaturated expansive soil slopes

ZHAN Liangtong

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2,   Pages 198-204 doi: 10.1007/s11709-007-0023-1

Abstract: The intensive soil-water interaction in unsaturated expansive soil is one of the major reasons for slopeIn this paper, the soil-water interaction is investigated with the full-scale field inspection of rainwaterIt is demonstrated that the soil-water interaction induced by seasonal wetting-drying cycles is veryIn addition, the abundant cracks in the expansive soil play an important role in the soil-water interactionThe seasonal wetting-drying cycles tend to result in a down-slope creeping of the shallow soil layer,

Keywords： strength     intensive soil-water     comprehensive     Infiltration     wetting-induced softening    

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Design and analyses of open-ended pipe piles in cohesionless soils

Yuan GUO,Xiong (Bill) YU

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1,   Pages 22-29 doi: 10.1007/s11709-016-0314-5

Abstract: Large open-ended pipe pile has been found to be advantageous for use in transportation projects.To close this practice gap, this paper first summarized different design methods for open-ended pipeA major factor for all the design codes is to properly account for the formation and effects of soilresults show that the arching effect significantly increases the internal unit shear resistance along pipeBesides, nearly 90% of the plug resistance is provided by the bottom half portion of the soil column.

Keywords： open-ended pipe pile     soil plug     DEM     base capacity    

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Image analysis of soil failure on defective underground pipe due to cyclic water supply and drainage

Toshifumi MUKUNOKI, Naoko KUMANO, Jun OTANI

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2,   Pages 85-100 doi: 10.1007/s11709-012-0159-5

Abstract: and the loss of suction in the base course and then, soil drainage into the pipe.observed that the loosening area was generated from the defected part with water-inflow and some of the soilBased on this observation, it might be said that the bulk density of soil around the defected pipe playedIn this paper, it was concluded that the low relative density of soil would become the critical factorground with high relative density more than 80% would be avoided in a few cycles of water inflow and soil

Keywords： relative density     grain property     model test     road subsidence     underground pipe     image processing     X-ray CT    

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Machine learning-based seismic assessment of framed structures with soil-structure interaction

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 2,   Pages 205-223 doi: 10.1007/s11709-022-0909-y

Abstract: technique (MLT) to predict the seismic performance of low- to mid-rise frame structures considering soil-structureinteraction (SSI).

Keywords： seismic hazard     artificial neural network     soil-structure interaction     seismic analysis    

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Diaphragm wall-soil-cap interaction in rectangular-closed- diaphragm-wall bridge foundations

Hua WEN, Qiangong CHENG, Fanchao MENG, Xiaodong CHEN

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 1,   Pages 93-100 doi: 10.1007/s11709-009-0015-4

Abstract: Diaphragm wall-soil-cap interaction was studied using a model test.It was observed that the distribution of soil resistance under the cap is not homogeneous.The soil resistance in the corner under the cap is larger than that in the border; and that in the centerThe distribution of soil resistance under the cap will be more uniform, if the sectional area of soilThe load shearing percentage of soil resistance under the cap is 10%-20%.

Keywords： diaphragm wall     bridge foundation     low cap     interaction    

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Demonstration of the Principle of Interaction between Plastic Volume Strain and Shear for Rock and Soil

Wang Jingtao

Strategic Study of CAE 2006, Volume 8, Issue 9,   Pages 24-29

Abstract:

The paper proposed a principle of interaction between plastic volume strains of and shear for rockand soil.Especially, the manners of the interaction between plastic volume strain and shear strain, the directexpansion of volume, the fact that the dependence of stress path is a comprehensive performance form of the interaction

Keywords： principle of interaction between plastic volume strain and shear strain for rock and soil     constitutiverelation of rock and soil     pressure-sensitivity     dilatancy    

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Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 346-352 doi: 10.1007/s11709-007-0046-7

Abstract: Shaking table tests on a dynamic interaction system of hard layered soil, pile foundation and frame structureBased on these tests, several key issues about the seismic response of the dynamic soil-structure interactionMagnification or reduction of vibration transferred by soil was related to soil characteristic, excitationGenerally, sand magnifies vibration, while viscous powder soil dampens vibration.

Keywords： super-structure     Generally     Magnification     frequency     different    

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Nonlinear elastic model for compacted clay concrete interface

R. R. SHAKIR, Jungao ZHU

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 187-194 doi: 10.1007/s11709-009-0033-2

Abstract: The clay soil used in the test was collected from the “Shuang Jang Kou” earth rockfill dam project.

Keywords： interface modeling     friction     soil structure interface     soil structure interaction     simple shear test    

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A simplified method for the determination of vertically loaded pile-soil interface parameters in layeredsoil based on FLAC

Jiu-jiang WU,Yan LI,Qian-gong CHENG,Hua WEN,Xin LIANG

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1,   Pages 103-111 doi: 10.1007/s11709-015-0328-4

Abstract: The numerical analysis of pile-soil interaction commonly requires a lot of trial works to determine theThen, a simplified method for the determination of pile-soil interface parameters in layered soil is

Keywords： determination of interface parameters     pile-soil interaction     FLAC3D     sensitivity analysis     layeredsoil    

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Major applications of heat pipe and its advances coupled with sorption system: a review

Yang YU, Guoliang AN, Liwei WANG

Frontiers in Energy 2019, Volume 13, Issue 1,   Pages 172-184 doi: 10.1007/s11708-019-0610-6

Abstract: Heat pipe utilizes continuous phase change process within a small temperature drop to achieve high thermalIn addition to some typical applications of thermal control and heat recovery, the heat pipe technologyThis paper presents an overview of the emerging working fluids, the major applications of heat pipe,and the advances in heat pipe type sorption system.Besides, the ongoing and perspectives of the solid sorption heat pipe are presented, expecting to serve

Keywords： heat pipe     sorption system     heat transfer     solid sorption heat pipe    

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Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations

Nishant SHARMA, Kaustubh DASGUPTA, Arindam DEY

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 62-81 doi: 10.1007/s11709-019-0570-2

Abstract: This article describes a novel approach for deciding optimal horizontal extent of soil domain to be usedfor finite element based numerical dynamic soil structure interaction (SSI) studies.SSI model for a 12 storied building frame, supported on pile foundation-soil system, is developed inLateral extent of soil domain, along with the soil properties, were varied exhaustively for a particulardomain is prescribed for various structural widths, soil types and peak ground acceleration levels of

Keywords： soil structure interaction     optimum lateral extent of soil domain length     multi-storyed framed building    

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Discontinuous mechanical behaviors of existing shield tunnel with stiffness reduction at longitudinal joints

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 37-52 doi: 10.1007/s11709-022-0920-3

Abstract: An analytical model is proposed to estimate the discontinuous mechanical behavior of an existing shield tunnel above a new tunnel. The existing shield tunnel is regarded as a Timoshenko beam with longitudinal joints. The opening and relative dislocation of the longitudinal joints can be calculated using Dirac delta functions. Compared with other approaches, our method yields results that are consistent with centrifugation test data. The effects of the stiffness reduction at the longitudinal joints (α and β), the shearing stiffness of the Timoshenko beam GA, and different additional pressure profiles on the responses of the shield tunnel are investigated. The results indicate that our proposed method is suitable for simulating the discontinuous mechanical behaviors of existing shield tunnels with longitudinal joints. The deformation and internal forces decrease as α, β, and GA increase. The bending moment and shear force are discontinuous despite slight discontinuities in the deflection, opening, and dislocation. The deflection curve is consistent with the additional pressure profile. Extensive opening, dislocation, and internal forces are induced at the location of mutation pressures. In addition, the joints allow rigid structures to behave flexibly in general, as well as allow flexible structures to exhibit locally rigid characteristics. Owing to the discontinuous characteristics, the internal forces and their abrupt changes at vulnerable sections must be monitored to ensure the structural safety of existing shield tunnels.

Keywords： tunnel–soil interaction     discontinuous analysis     longitudinal joints     existing shield tunnel     Timoshenko    

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Title Author Date Type Operation

Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Journal Article

Assessment of glass fiber-reinforced polyester pipe powder in soil improvement

Journal Article

Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions

Journal Article

Soil-water interaction in unsaturated expansive soil slopes

ZHAN Liangtong

Journal Article

Design and analyses of open-ended pipe piles in cohesionless soils

Yuan GUO,Xiong (Bill) YU

Journal Article

Image analysis of soil failure on defective underground pipe due to cyclic water supply and drainage

Toshifumi MUKUNOKI, Naoko KUMANO, Jun OTANI

Journal Article

Machine learning-based seismic assessment of framed structures with soil-structure interaction

Journal Article

Diaphragm wall-soil-cap interaction in rectangular-closed- diaphragm-wall bridge foundations

Hua WEN, Qiangong CHENG, Fanchao MENG, Xiaodong CHEN

Journal Article

Demonstration of the Principle of Interaction between Plastic Volume Strain and Shear for Rock and Soil

Wang Jingtao

Journal Article

Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

Journal Article

Nonlinear elastic model for compacted clay concrete interface

R. R. SHAKIR, Jungao ZHU

Journal Article

A simplified method for the determination of vertically loaded pile-soil interface parameters in layeredsoil based on FLAC

Jiu-jiang WU,Yan LI,Qian-gong CHENG,Hua WEN,Xin LIANG

Journal Article

Major applications of heat pipe and its advances coupled with sorption system: a review

Yang YU, Guoliang AN, Liwei WANG

Journal Article

Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations

Nishant SHARMA, Kaustubh DASGUPTA, Arindam DEY

Journal Article

Discontinuous mechanical behaviors of existing shield tunnel with stiffness reduction at longitudinal joints

Journal Article