Strain-based design for buried pipelines subjected to landslides

Landslides are one of the key problems for stability analysis of pipelines in the western region of China where the geological conditions are extremely complicated. In order to offer a theoretical basis for the pipe-soil interaction, the general finite element program ABAQUS is used to analyze the distribution of pipe strain caused by landslide through which the pipeline passes. In this paper the Ramberg-Osgood constitutive equation is used to study the strain-based mechanical characteristics of pipelines. Different calculation schemas are designed by considering the change of spatial relationship between pipeline and landslide, and the change of D/t, diameter-thickness ratio of pipeline. The results indicate that the pipeline is primarily subjected to tension stress when the landslide crosses the pipeline perpendicularly, the pipe strain is a maximum along the central axis of the landslide, and reverse bending occurs on pipeline at both edges of the landslide. The pipeline is primarily subjected to friction force caused by the downward movement of the landslide, and the friction force is relatively small when the landslide is parallel to the pipeline. The pipe strain is in proportional to D/t, and this means decreasing D/t can help to improve security of pipelines subjected to the landslide.

[1]  Thomas H. Hyde,et al.  Analysis of stresses in pipes indented by long external indentations and subsequent stress variations due to pressure fluctuations , 2009 .

[2]  Chen Hong-d,et al.  Strain-based Design for Pipeline and Development of Pipe Steels with High Deformation Resistance , 2007 .

[3]  Y Zhang Discussion of the Influencing Factor on the Critical Buckling Strain for Pipelines Based on Gray Correlation Analysis , 2008 .

[4]  Zhao Zhong-gang Types of Geologie Disasters for Long Distance Transmission Pipelines as well as Prevention-control Measures and Prediction Techniques , 2006 .

[5]  Tao Hong-wei Pipeline Landslides Hazard Prevention and Control , 2010 .

[6]  S. Iimura Simplified mechanical model for evaluating stress in pipeline subject to settlement , 2004 .

[7]  C. Hellmich,et al.  Loading of soil-covered oil and gas pipelines due to adverse soil settlements - Protection against thermal dilatation-induced wear, involving geosynthetics , 2006 .

[8]  Zhang Hong,et al.  PIPELINE DESIGN CRITERIA BASED ON STRAIN AND THE CONTROL FACTORS , 2008 .

[9]  Amit Prashant,et al.  Analysis of buried pipelines subjected to reverse fault motion , 2011 .

[10]  P. de Buhan,et al.  Mixed modelling applied to soil–pipe interaction , 2003 .

[11]  Christophe Gaudin,et al.  Advancing pipe–soil interaction models in calcareous sand , 2010 .

[12]  Michael S. Weir,et al.  Strain-based Design Methodology For Seismic And Arctic Regions , 2007 .

[13]  Zuo Shang-zh Breakage Action and Defend Measures to Pipeline under Geological Disaster , 2008 .

[14]  Xxyyzz,et al.  Guidelines for the Seismic Design of Oil and Gas Pipeline Systems , 1984 .

[15]  H. E. Stewart,et al.  Factors influencing the behavior of buried pipelines subjected to earthquake faulting , 2009 .

[16]  Radu Popescu,et al.  Influence of Geotechnical Loads on Local Buckling Behavior of Buried Pipelines , 2008 .

[17]  Yun Wook Choo,et al.  Remediation for buried pipeline systems under permanent ground deformation , 2007 .

[18]  Bipul Hawlader,et al.  Modelling of pipeline under differential frost heave considering post-peak reduction of uplift resistance in frozen soil , 2006 .