Failures and integrity of pipelines subjected to soil movements

2016 ◽  
pp. 105-122
Author(s):  
Hernán G. Kunert ◽  
Anibal A. Marquez ◽  
Pablo Fazzini ◽  
José L. Otegui
Keyword(s):  
Soil Movements

Quantifying the threat to archaeological sites from the erosion of cultivated soil

Antiquity ◽  
2006 ◽  
Vol 80 (309) ◽  
pp. 658-670 ◽  
Author(s):  
Keith Wilkinson ◽  
Andrew Tyler ◽  
Donald Davidson ◽  
Ian Grieve
Keyword(s):  
World Wide ◽  
Site Formation ◽  
Archaeological Sites ◽  
Site Formation Processes ◽  
Formation Processes ◽  
Know How ◽  
The Past ◽  
Nuclear Weapons Testing ◽  
Resource Managers ◽  
Soil Movements

Ploughing is probably the greatest agent of attrition to archaeological sites world-wide. In every country, every year, a bit more is shaved off buried strata and a bit more of the past becomes unreadable. On the other hand, people must eat and crops must be planted. How can the fields be best managed to get the best of both worlds? Perhaps the most pressing need for resource managers is to know how quickly a particular field is eroding: negotiation and protection is then possible. Up to now that has been difficult to measure.The new procedure presented here, which draws on the unexpected benefits of nuclear weapons testing, shows how variation in the concentration of the radioisotope 137Cs can be used to monitor soil movements over the last 40 years. The measurements allow a site's ‘life expectancy’ to be calculated, and there are some promising dividends for tracking site formation processes.

Pipeline Visualization, Simulation and Monitoring in Unstable Areas Affected by Soil Movements at Serra do Mar – Brazil

2002 ◽  
Author(s):  
Jacqueline V. R. Musman ◽  
Alvaro M. Costa ◽  
Claudio Amaral ◽  
Robson C. Santos ◽  
Maria Tereza Carnevale ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Interaction Model ◽  
Simulation Software ◽  
Serra Do Mar ◽  
Knowing That ◽  
Extensive Program ◽  
Complete Set ◽  
The Times ◽  
Soil Movements ◽  
Visualization Simulation

In this work we discuss the importance of visualization, simulation and monitoring pipelines constructed in areas geologically unstable. In particular it is of great concern pipelines crossing Serra do Mar, in Brazil, where there are colluvium deposits subject to slow movements not traceable by a simple visual inspection most of the times. In order to guarantee the structural integrity of the pipeline it is necessary to measure the tensions transmitted by the ground to the pipeline. Knowing that the soil-pipeline interaction is extremely complex the implementation of an extensive program involving visualization, simulation and monitoring that includes not only the slope but also the pipeline becomes mandatory. This program seeks the collection of information that allows the establishment of a reliable interaction model. This model must be capable of providing operational control parameters and subsidize the decision of an intervention in the pipeline. Therefore the safety of pipeline operations can be maximized through instruction of operators and establishment of monitoring and inspection routines. Right now, in a joint effort of CENPES and TRANSPETRO, a complete set of visualization and numerical simulation software platform is available and it is being used to build a 3D model of all the geotechnical risky areas in Serra do Mar. Also the installation and operation of a pilot monitoring system, including piezometers and inclinometers on the slope and strain gauges on the pipeline, at three different pipelines crossing Serra do Mar, with data acquisition in real time is being undertaken.

Prévision par modélisation numérique de la zone de risque bordant un tronçon de rivière subissant une crue exceptionnelle

2003 ◽  
Vol 30 (3) ◽  
pp. 568-579 ◽  
Author(s):  
T Mahdi ◽  
C Marche
Keyword(s):  
Slope Stability ◽  
Transport Model ◽  
Modélisation Numérique ◽  
River Bed ◽  
Geotechnical Characteristics ◽  
Definition Of ◽  
Saguenay River ◽  
Downstream Area ◽  
Soil Movements

The direct impacts of floods are often considered as limited to the maximum downstream area exposed to the flooding. Considering the size of exceptional floods, the river bed could undergo deep changes. Pairing the GSTARS sediment transport model to a slope stability model (modified Bishop method) that we developed, this paper presents a methodology leading to the definition of a true safety zone along the shores as it takes into account the risk of floods and soil movements: each section of this river undergoes changes due to sediment-fluvial hydraulics ( erosion-deposit) and then eventual landslides modify the profiles. To analyze this, we had first to determine the hydraulic and geotechnical characteristics then use them to test the slope stability of the various legs of the watercourse before and during flooding. The application of this method to a tributary of the Saguenay River for the 1996 "downpour" shows a very good correlation of results with those collected in situ. The method can be directly applied to define the anticipated evacuation zone in case of dam failure.Key words: flooding, evacuation zone, numerical simulations, slope stability, transportation of solids.[Journal Translation]

Reliability analysis of drilled piers in expansive soils

1991 ◽  
Vol 28 (6) ◽  
pp. 834-842 ◽  
Author(s):  
Carlos Ferregut ◽  
Miguel Picornell
Keyword(s):  
Probabilistic Models ◽  
Load Transfer ◽  
Expansive Soils ◽  
Free Field ◽  
Expansive Soil ◽  
Maximum Tensile Stress ◽  
Limit States ◽  
Tensile Stresses ◽  
Head Displacement ◽  
Soil Movements

Heavy structures in areas with expansive soils are commonly founded on piers resting beneath the surface active zone. During construction, the piers remain essentially unloaded and are exposed to potentially high tensile stresses that can split the pier unless the pier has been adequately reinforced. In this context, uncertainties arise relative to (i) the parameters governing the load transfer from the soil to the pier, (ii) the potential heave to be expected in a "free field" condition, when the soil movements are not restricted by the pier, and (iii) the estimation of the pier capacity to resist the induced stresses. Probabilistic models to handle and to quantify these uncertain parameters are constructed and then used to compute the probability of exceeding two potential limit states: (i) vertical pier head displacement and (ii) maximum tensile stress in a cross section of the pier. The displacements are used to assess the serviceability performance of the pier, and the maximum tensile stresses are used to estimate the reliability of the pier. Key words: piers, expansive soil, reliability, probability, foundations.

scholarly journals Development of a magnetic tracking system for monitoring soil movements induced by geohazards

2019 ◽  
Vol 92 ◽  
pp. 17007 ◽  
Author(s):  
Xiaoyu Chen ◽  
Rolando P. Orense
Keyword(s):  
Magnetic Fields ◽  
Permanent Magnets ◽  
Tracking System ◽  
Soil Liquefaction ◽  
Small Scale ◽  
Interior Point Algorithm ◽  
Tracking Accuracy ◽  
Tracking Errors ◽  
Magnetic Tracking ◽  
Soil Movements

In the study of geotechnical hazards, such as soil liquefaction and landslides, the analysis of soil movements is always one of the major preoccupations. An efficient movement sensing technique requires the tracking of subsurface soil for the purpose of examining the mechanism involved. A magnetic tracking system is therefore proposed, with permanent magnets as trackers and magnetometers as receivers. When permanent magnets, deployed within the soil to serve as excitation sources, move with soil body during a geotechnical event, they generate static magnetic fields whose flux densities are related with the positions and orientations of the magnets. Magnetometers are used as receivers to detect the generated magnetic fields, which can be further used in calculating the magnets' locations and orientations based on appropriately developed algorithms. Comparison between situations where the trackers are exposed to air and embedded within soil was conducted to evaluate the influence of soil (wet and dry) on the tracking accuracy. Also, multi-objective tracking is realized by using the particle swarm optimization (PSO) technique combined with interior-point algorithm. The tracking errors are evaluated and applications of the proposed system in small-scale laboratory tests for geohazards are discussed.

Analysis of the field monitoring data on soil movements and adjacent building settlement due to shield tunnelling

2019 ◽  
Vol 36 (4) ◽  
pp. 1219-1237
Author(s):  
Zhi Ding ◽  
Xinjiang Wei ◽  
Xiao Zhang ◽  
Xinsheng Yin
Keyword(s):  
Design Methodology ◽  
Field Monitoring ◽  
Monitoring Data ◽  
Structural Deformation ◽  
Content Type ◽  
Grouting Pressure ◽  
Adjacent Building ◽  
Different Types ◽  
Shield Tunnelling ◽  
Soil Movements

Purpose The shield tunnels closely constructed near the foundations have an inevitable influence on the structures, even results in the large settlement or uplift of the structures. Design/methodology/approach The comparison of structural deformation of three different foundations is presented based on the field monitoring data. Findings Shield tunnelling parameters vary for the different types of foundations. For the long pile foundations, the recommended speed is 3 to 4 cm/min, the grouting pressure is about 0.3 MPa and the grouting rate ranges from 150 to 180. Originality/value The study based on the field monitoring data is rarely reported, especially the topic about the structural deformation of different types of the foundations.

Sign in / Sign up

Export Citation Format

Share Document