The Experts below are selected from a list of 117 Experts worldwide ranked by ideXlab platform

Chuanjun Han - One of the best experts on this subject based on the ideXlab platform.

  • mechanical behavior analysis of the buried steel Pipeline Crossing landslide area
    Journal of Pressure Vessel Technology-transactions of The Asme, 2016
    Co-Authors: Jie Zhang, Zheng Liang, Chuanjun Han
    Abstract:

    Landslide movement is one of the threats for the structural integrity of buried Pipelines that are the main ways to transport oil and gas. In order to offer a theoretical basis for the design, safety evaluation and maintenance of Pipelines, mechanical behavior of the buried steel Pipeline Crossing landslide area was investigated by finite element method, considering Pipeline-soil interaction. Effects of landslide soil parameters, Pipeline parameters and landslide scale on the mechanical behavior of the buried Pipeline were discussed. The results show that there are three high stress areas on the buried Pipeline sections where the bending deformation are bigger. High stress area of the compression side is bigger than it on the tensile side, and the tensile strain is bigger than the compression strain in the deformation process. Buried Pipeline in the landslide bed with hard soil is prone to fracture. Bigger deformations appear on the Pipeline sections that the inside and outside lengths of the interface are 30m and 10m respectively. The maximum displacement of the Pipeline is smaller than the landslide displacement for the surrounding soil's deformation. Bending deformations and tensile strain of the Pipeline increase with the landslide displacement increases. Bending deformation and the maximum tensile strain of the Pipeline increase with increasing of the soil's elasticity modulus, cohesion and Pipeline's diameter-thickness ratio. Soil's Poisson's ratio has a great effect on the displacement of the middle part, but it has a little effect on other sections' displacement.

  • numerical modeling of mechanical behavior for buried steel Pipelines Crossing subsidence strata
    PLOS ONE, 2015
    Co-Authors: Jie Zhang, Zheng Liang, Chuanjun Han
    Abstract:

    This paper addresses the mechanical behavior of buried steel Pipeline Crossing subsidence strata. The investigation is based on numerical simulation of the nonlinear response of the Pipeline-soil system through finite element method, considering large strain and displacement, inelastic material behavior of buried Pipeline and the surrounding soil, as well as contact and friction on the Pipeline-soil interface. Effects of key parameters on the mechanical behavior of buried Pipeline were investigated, such as strata subsidence, diameter-thickness ratio, buried depth, internal pressure, friction coefficient and soil properties. The results show that the maximum strain appears on the outer transition subsidence section of the Pipeline, and its cross section is concave shaped. With the increasing of strata subsidence and diameter-thickness ratio, the out of roundness, longitudinal strain and equivalent plastic strain increase gradually. With the buried depth increasing, the deflection, out of roundness and strain of the Pipeline decrease. Internal pressure and friction coefficient have little effect on the deflection of buried Pipeline. Out of roundness is reduced and the strain is increased gradually with the increasing of internal pressure. The physical properties of soil have a great influence on the mechanical properties of buried Pipeline. The results from the present study can be used for the development of optimization design and preventive maintenance for buried steel Pipelines.

Xiaoben Liu - One of the best experts on this subject based on the ideXlab platform.

  • corrigendum to a semi empirical model for peak strain prediction of buried x80 steel Pipelines under compression and bending at strike slip fault Crossings j nat gas sci eng 32 2016 465 475
    Journal of Natural Gas Science and Engineering, 2017
    Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Yinshan Han, Wei Zheng
    Abstract:

    Abstract We have noticed some errors in regression coefficients of proposed semi-empirical formula in [J. Nat. Gas Sci. Eng. 32(2016) 465–475] in calculating the peak compressive strain for buried X80 steel Pipeline Crossing strike-slip faults.

  • Buckling failure mode analysis of buried X80 steel gas Pipeline under reverse fault displacement
    Engineering Failure Analysis, 2017
    Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Yanfei Chen
    Abstract:

    Abstract High strength steel Pipeline is widely used in long distance transportation of natural gas. These Pipelines are vulnerable under active faults in strong seismic areas. The buckling failure modes of high strength X80 gas Pipeline Crossing reverse fault were analyzed systematically in this paper. Based on the nonlinear finite element method, a pipe-elbow hybrid model was developed for buckling failure analysis of X80 steel Pipeline under reverse fault displacement. The pipe soil interaction relationship was simulated by a series of elastic-plastic soil springs. The nonlinearity of pipe material and large deformation were also considered. The non-linear stabilization algorithm was selected due to the convergence of the numerical model. Engineering parameters used in the Second West to East Gas Pipeline in China were selected in this study. Typical features for beam buckling and local buckling failure in the proposed numerical model were derived. Based on a series of parametric studies, the influences of the fault displacement, fault dip angle, pipe wall thickness, buried depth of pipe and soil conditions on the buckling failure modes were discussed in detail. The proposed methodology can be referenced for failure analysis and strength evaluation of Pipelines subjected to reverse fault displacement.

Jie Zhang - One of the best experts on this subject based on the ideXlab platform.

  • mechanical behavior analysis of the buried steel Pipeline Crossing landslide area
    Journal of Pressure Vessel Technology-transactions of The Asme, 2016
    Co-Authors: Jie Zhang, Zheng Liang, Chuanjun Han
    Abstract:

    Landslide movement is one of the threats for the structural integrity of buried Pipelines that are the main ways to transport oil and gas. In order to offer a theoretical basis for the design, safety evaluation and maintenance of Pipelines, mechanical behavior of the buried steel Pipeline Crossing landslide area was investigated by finite element method, considering Pipeline-soil interaction. Effects of landslide soil parameters, Pipeline parameters and landslide scale on the mechanical behavior of the buried Pipeline were discussed. The results show that there are three high stress areas on the buried Pipeline sections where the bending deformation are bigger. High stress area of the compression side is bigger than it on the tensile side, and the tensile strain is bigger than the compression strain in the deformation process. Buried Pipeline in the landslide bed with hard soil is prone to fracture. Bigger deformations appear on the Pipeline sections that the inside and outside lengths of the interface are 30m and 10m respectively. The maximum displacement of the Pipeline is smaller than the landslide displacement for the surrounding soil's deformation. Bending deformations and tensile strain of the Pipeline increase with the landslide displacement increases. Bending deformation and the maximum tensile strain of the Pipeline increase with increasing of the soil's elasticity modulus, cohesion and Pipeline's diameter-thickness ratio. Soil's Poisson's ratio has a great effect on the displacement of the middle part, but it has a little effect on other sections' displacement.

  • numerical modeling of mechanical behavior for buried steel Pipelines Crossing subsidence strata
    PLOS ONE, 2015
    Co-Authors: Jie Zhang, Zheng Liang, Chuanjun Han
    Abstract:

    This paper addresses the mechanical behavior of buried steel Pipeline Crossing subsidence strata. The investigation is based on numerical simulation of the nonlinear response of the Pipeline-soil system through finite element method, considering large strain and displacement, inelastic material behavior of buried Pipeline and the surrounding soil, as well as contact and friction on the Pipeline-soil interface. Effects of key parameters on the mechanical behavior of buried Pipeline were investigated, such as strata subsidence, diameter-thickness ratio, buried depth, internal pressure, friction coefficient and soil properties. The results show that the maximum strain appears on the outer transition subsidence section of the Pipeline, and its cross section is concave shaped. With the increasing of strata subsidence and diameter-thickness ratio, the out of roundness, longitudinal strain and equivalent plastic strain increase gradually. With the buried depth increasing, the deflection, out of roundness and strain of the Pipeline decrease. Internal pressure and friction coefficient have little effect on the deflection of buried Pipeline. Out of roundness is reduced and the strain is increased gradually with the increasing of internal pressure. The physical properties of soil have a great influence on the mechanical properties of buried Pipeline. The results from the present study can be used for the development of optimization design and preventive maintenance for buried steel Pipelines.

Hong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • corrigendum to a semi empirical model for peak strain prediction of buried x80 steel Pipelines under compression and bending at strike slip fault Crossings j nat gas sci eng 32 2016 465 475
    Journal of Natural Gas Science and Engineering, 2017
    Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Yinshan Han, Wei Zheng
    Abstract:

    Abstract We have noticed some errors in regression coefficients of proposed semi-empirical formula in [J. Nat. Gas Sci. Eng. 32(2016) 465–475] in calculating the peak compressive strain for buried X80 steel Pipeline Crossing strike-slip faults.

  • Buckling failure mode analysis of buried X80 steel gas Pipeline under reverse fault displacement
    Engineering Failure Analysis, 2017
    Co-Authors: Xiaoben Liu, Hong Zhang, Mengying Xia, Yanfei Chen
    Abstract:

    Abstract High strength steel Pipeline is widely used in long distance transportation of natural gas. These Pipelines are vulnerable under active faults in strong seismic areas. The buckling failure modes of high strength X80 gas Pipeline Crossing reverse fault were analyzed systematically in this paper. Based on the nonlinear finite element method, a pipe-elbow hybrid model was developed for buckling failure analysis of X80 steel Pipeline under reverse fault displacement. The pipe soil interaction relationship was simulated by a series of elastic-plastic soil springs. The nonlinearity of pipe material and large deformation were also considered. The non-linear stabilization algorithm was selected due to the convergence of the numerical model. Engineering parameters used in the Second West to East Gas Pipeline in China were selected in this study. Typical features for beam buckling and local buckling failure in the proposed numerical model were derived. Based on a series of parametric studies, the influences of the fault displacement, fault dip angle, pipe wall thickness, buried depth of pipe and soil conditions on the buckling failure modes were discussed in detail. The proposed methodology can be referenced for failure analysis and strength evaluation of Pipelines subjected to reverse fault displacement.

  • research on aseismatic measures of gas Pipeline Crossing a fault for strain based design
    Volume 5: High Pressure Technology; Nondestructive Evaluation Division; Student Paper Competition, 2009
    Co-Authors: Hong Zhang
    Abstract:

    There are a lot of researches on qualitative aseismatic measures for buried gas Pipeline Crossing movable faults. But a few of them are quantitative, especially in the size and shape of the trench. In this paper, based on strain-based Pipeline design method and finite element method, a new strain analysis model for buried large diameter gas Pipeline is presented that deals quantitatively with the Pipeline strain influencing factors, such as the size and shape of the trench, buried pipe depth, Crossing angle between Pipeline and fault, pipe diameter and wall thickness, mechanical properties of original soil and back fill soil, inner Pipeline pressure. In this model, the Pipeline is simulated by pipe element and elbow element, soil-pipe interaction is reduced to 3 dimensional soil spring. By means of FEM software ABAQUS, detail analysis is performed for a real design case of Pipeline Crossing a movable fault in the second west-east gas Pipeline project of China, and optimized Pipeline Crossing fault scheme is proposed which can minimize the Pipeline strain and limit it in allowable value.Copyright © 2009 by ASME

Wei Zheng - One of the best experts on this subject based on the ideXlab platform.