Forensic geotechnical investigations into varied pipeline failures

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Devapriya C. Wijeyesekera
Keyword(s):  
Geotechnical Investigations ◽  
Pipeline Failures

scholarly journals A Case Study of a Large Unstable Mass Stabilization: “El Portalet” Pass at the Central Spanish Pyrenees

2021 ◽  
Vol 11 (16) ◽  
pp. 7176
Author(s):  
Guillermo Cobos ◽  
Miguel Ángel Eguibar ◽  
Francisco Javier Torrijo ◽  
Julio Garzón-Roca
Keyword(s):  
Water Table ◽  
Critical Factor ◽  
Slope Stabilization ◽  
Survey Techniques ◽  
Geotechnical Investigations ◽  
Spanish Pyrenees ◽  
Parking Lot ◽  
Unstable Slope ◽  
Total Stability

This case study presents the engineering approach conducted for stabilizing a landslide that occurred at “El Portalet” Pass in the Central Spanish Pyrenees activated due to the construction of a parking lot. Unlike common slope stabilization cases, measures projected here were aimed at slowing and controlling the landslide, and not completely stopping the movement. This decision was taken due to the slow movement of the landslide and the large unstable mass involved. The degree of success of the stabilization measures was assessed by stability analyses and data obtained from different geotechnical investigations and satellite survey techniques such as GB-SAR and DinSAR conducted by different authors in the area under study. The water table was found to be a critical factor in the landslide’s stability, and the tendency of the unstable slope for null movement (total stability) was related to the water table lowering process, which needs more than 10 years to occur due to regional and climatic issues. Results showed a good performance of the stabilization measures to control the landslide, demonstrating the effectiveness of the approach followed, and which became an example of a good response to the classical engineering duality cost–safety.

Structural and geotechnical investigations on Sivrice earthquake (Mw = 6.8), January 24, 2020

2021 ◽  
Author(s):  
Rasim Temür ◽  
Erdem Damcı ◽  
Seda Öncü-Davas ◽  
Cihan Öser ◽  
Sinan Sarğın ◽  
...  
Keyword(s):  
Geotechnical Investigations

Different Failure Modes of Non-Metallic Pipelines at Connections

2014 ◽  
Author(s):  
Alex Tatarov ◽  
Frank Gareau
Keyword(s):  
Failure Modes ◽  
Root Cause Analysis ◽  
Case Histories ◽  
Actual Case ◽  
Cause Analysis ◽  
Root Cause ◽  
Pipeline Failures

The article provides an overview of different modes of failures in composite pipeline connections. Non-metallic spoolable (SCP) and reinforced thermoplastic pipelines (RTP) of different makes will be addressed. The article is based on actual case histories of pipeline failures (root cause analysis). Numerous factors contributing to failures and recommendations are discussed.

Assessment of Free Spanning Pipeline Strength

2013 ◽  
Vol 310 ◽  
pp. 194-197
Author(s):  
Hong Jun Zhu ◽  
Xing Qi ◽  
Yong Chuang Yang ◽  
Ming Yang Wang ◽  
Xiao Xu Liu ◽  
...  
Keyword(s):  
Yield Strength ◽  
Fatigue Failure ◽  
Assessment Method ◽  
Submarine Pipeline ◽  
Strength Assessment ◽  
Buckling Strength ◽  
Safety Design ◽  
Pipeline Failures

Submarine pipeline failures usually occur at free span part, and free spanning pipeline is easily induced vibration by vortex, which accelerates the fatigue failure of pipe. Therefore, it is necessary to assess the strength of free spanning pipeline at regular intervals. In this paper, considering the effects of VIV, resonance assessment and yield strength assessment as well as buckling strength assessment are enumerated. And an illustration is calculated to verify the reliability of assessment method. This research may provide a guide for safety design, installation and maintenance of submarine pipeline.

scholarly journals Empirical Correlation between Geotechnical and Geophysical Parameters in a Landslide Zone (Case Study: Nargeschal Landslide)

2018 ◽  
Vol 22 (3) ◽  
pp. 195-204 ◽  
Author(s):  
Sadegh Rezaei ◽  
Issa Shooshpasha ◽  
Hamed Rezaei
Keyword(s):  
Electrical Resistivity ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Geophysical Methods ◽  
Field Investigation ◽  
Least Square ◽  
Geotechnical Investigations ◽  
Geophysical Techniques ◽  
Landslide Zone

Today, geotechnical and geophysical techniques are used for landslide evaluation. Geotechnical methods provide accurate data, but are time consuming and costly. Geophysical techniques, however, are fast and inexpensive, yet their accuracy is lower than that of the geotechnical methods. Therefore, simultaneous use of geotechnical and geophysical methods provides a suitable solution for landslide evaluation. Availability of geotechnical and geophysical data makes it possible to investigate correlation between different parameters. Correlating geotechnical and geophysical parameters ends up lowering field investigation costs and enhancing subsurface survey speed in a landslide zone. In the present study, in order to evaluate Nargeschal landslide in Iran, ambient noise measurement, ERT survey, and geotechnical investigations were used. Once finished with data processing, the data obtained from geotechnical and geophysical investigations were correlated. These included SPT-N – electrical resistivity, soil moisture content – electrical resistivity, and SPT-N – shear wave velocity correlations. The correlations were examined using two methods, namely Spearman’s coefficient test and least square regression analysis. The results obtained from the two methods were in good agreement with one another. The correlations obtained in this study were of moderate to very strong strength and fell in the range of the results of previous studies. Investigation of the results indicated significant influences of ground water on electrical resistivity and soil stiffness on shear wave velocity. Results of this study can be used for soil classification and determination of mechanical and seismic characteristics of soil across various areas.

Implementing a Geohazard Integrity Management Program: Statistics and Lessons Learned Over 15 Years

2014 ◽  
Author(s):  
Alex J. Baumgard ◽  
Tara L. Coultish ◽  
Gerry W. Ferris
Keyword(s):  
Management System ◽  
Management Program ◽  
Lessons Learned ◽  
Proactive Approach ◽  
Oil Pipelines ◽  
Pipeline Networks ◽  
The Usa ◽  
Integrity Management ◽  
Pipeline Failures ◽  
Program Challenges

Over the last 15 years, BGC Engineering Inc. has developed and implemented a geohazards Integrity Management Program (IMP) with 12 major pipeline operators (consisting of gas and oil pipelines and of both gathering and transmission systems). Over this time, the program has been applied to the assessment of approximately 13,500 individual hydrotechnical and geotechnical geohazard sites spanning approximately 63,000 km of operating pipelines in Canada and the USA. Hydrotechnical (watercourse) and geotechnical (slope) hazards are the primary types of geohazards that have directly contributed to pipeline failures in Canada. As with all IMPs, the core objectives of a geohazard management system are to ensure a proactive approach that is repeatable and defensible. In order to meet these objectives, the program allows for varying levels of intensity of inspection and a recommended timescale for completion of actions to manage the identified geohazards in accordance with the degree of hazard that the site poses to the pipeline. In this way, the sites are managed in a proactive manner while remaining flexible to accommodate the most current conditions at each site. This paper will provide a background to the key components of the program related specifically to existing operating pipeline systems, present pertinent statistics on the occurrence of various types of geohazards based on the large dataset of inspections, and discuss some of the lessons learned in the form of program results and program challenges from implementing a geohazard integrity management system for a dozen operators with different ages of systems, complexity of pipeline networks, and in varied geographic settings.

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