Protection Control Scheme and Evaluation of Effectson Pipeline Crossing beneath Landslide Area

Li, Changdong; Wang, Liangqing; Jing, Hongyuan; Liu, Qingtao

doi:10.1061/(asce)ps.1949-1204.0000130

Cited by 15 publications

(6 citation statements)

References 20 publications

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“…The load remains constant for 10 min in the first, second and third stages, and given it is gradually difficult to apply load with the load increasing and the applied load is instable, the interval time is approximately set to 20 min in the fourth stage [41,44]. By monitoring the strain along the length of the pile, the bending moment can be determined using Equation (1), see Figure 7. The pressure sensor monitored the values applied to the sliding body, as shown in Figure 8.…”

Section: Analysis Of the Test Model Resultsmentioning

confidence: 99%

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Effect of the Soft and Hard Interbedded Layers of Bedrock on the Mechanical Characteristics of Stabilizing Piles

et al. 2020

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In this paper, the mechanical characteristics of stabilizing piles embedded in layered bedrocks are studied both experimentally and numerically. The influence of soft and hard interbedded layers in the structure of the bedrock on the mechanical characteristics of stabilizing piles is particularly investigated. The discrete element method is used to numerically investigate the response of the stabilizing piles embedded in composite and inclined bedrocks. The simulation results and comparison with experimental data are presented to demonstrate the effectiveness and accuracy of the discrete element model. As the dip angle of the soft/hard interbedded bedrock layers increases from 0° to 45°, it is observed that the displacement of the embedded section of the stabilizing pile increases and reaches the maximum displacement at 45°. In the range of 45° to 75°, the influence of the dip angle of the layered bedrock on the displacement of the embedded section of the pile is gradually reduced.

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Section: Analysis Of the Test Model Resultsmentioning

confidence: 99%

“…Landslides widely occur in the Three Gorges Reservoir Region in China [1][2][3][4]. Stabilizing piles, acting as retaining structures subjected to lateral loading, are widely used to improve the stability of the slopes and prevent their excessive movements [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Soft and Hard Interbedded Layers of Bedrock on the Mechanical Characteristics of Stabilizing Piles

et al. 2020

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“…Upper part of the load, q π 9 = q/lρg C q = C l C ρ C g 1 : 30 4 Geofluids three layers from top to bottom: slide body, slide belt, and bedrock layer. Four groups of micropiles were embedded in the landslide body, with the center line of the box as the boundary.…”

Section: Model Test Designmentioning

confidence: 99%

“…Topal and Akin [3] studied the stability of pipeline landslide in Karacabey area by means of field investigation and measurement, laboratory test, and landslide limit equilibrium analysis and put forward the treatment methods such as removing landslide soil, leveling slope, and reducing buried depth of pipeline. Li et al [4] studied the interaction mechanism between antislide piles and landslide soil and optimized the deployment of antislide piles to improve landslide stability and reduce pipeline stress and displacement. Marinos et al [5] assessed the pipeline risk at 82 landslide sites in Albania, classifying landslides as "high risk," "medium risk," and "low risk" based on the assessment results and considering risk mitigation measures.…”

Section: Introductionmentioning

confidence: 99%

Study on Interaction Mechanism of Natural Gas Pipe-Landslide System Reinforced by Micropile Groups Based on Model Test

Guan

et al. 2022

Geofluids

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Natural gas pipeline projects in mountainous areas are inevitably affected by geological disasters such as landslides, which pose a serious threat to the safe operation of pipelines along the routes crossing landslide areas. In this paper, based on a pipe-landslide project in a mountainous area in southwest China, the interaction mechanism and failure evolution process of the landslide-pipeline system reinforced by two kinds of micropiles are studied through indoor large-scale physical model tests, and some suggestions on the support work of the pipe-landslide project are put forward according to the test results. It was found that the deformation process of the engineering system composed of landslide, micropile, and pipeline presents a high degree of synergy under the external force and mainly experiences four stages: initial deformation period, uniform deformation period, accelerated deformation period, and residual deformation period. The bending deformation of the perforated pipe micropile is large at the 1/4 position of the pile top from the pile bottom, and the deformation of the screw micropile near the sliding surface is serious. The pipeline welding port is the weak position of the pipeline; after the failure of the pile, the pipeline interface is first cracked, along the interface position along the two ends of the tear, and finally completely broken. The screw micropile cannot effectively resist the landslide thrust at a large load level, so the risk of pipeline damage is greater. The yield strength and ultimate strength of the perforated pipe micropile are greater than those of the screw micropile, and the perforated pipe micropile can still exert a certain residual resistance after reaching the ultimate bearing capacity, which has a beneficial effect on the reinforcement of the pipeline crossing the landslide system. The research results provide important reference value for landslide-pipeline treatment engineering.

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“…Many researchers have worked on the issue of soilpipeline interaction under various loading conditions (Rajani & Morgenstern, 1993;Li et al, 2013;Kaya et al, 2016;Randeniya et al, 2019;Polat et al, 2021). Using a graphical procedure, Palmer et al (1999) developed a simple method to assess longitudinal compressive stresses acting on pipelines buried in an arbitrary slope profile.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Buried Pipelines Subjected to Permanent Ground Deformations Due to Shallow Slope Failure

Bouatia¹,

Demagh²,

Derriche³

2023

JJCE

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Permanent ground deformations (PGDs) induced by slope failures cause catastrophic damage to buried pipelines. This paper presents a 2D plane-strain numerical analysis of the behavior of a 800 mm water transport pipeline buried in the Aine-Tine slope (Mila, Algeria) subjected to shallow PGD, as it could be triggered by the recent earthquake of August 07th, 2020 (M= 4.9). The analysis is carried out through the application of an incremental displacement to simulate the soil-pipeline interaction while focusing on the effect of (1) the magnitude of the PGD and (2) the rigidity of the pipeline on the structural response of the pipeline. The elasticperfectly Mohr-Coulomb model was used to simulate the soil behavior and the elastic model was used to simulate that of the steel pipe. Pipeline deformations (i.e., translation and ovalization) and radial internal forces’ (i.e., axial forces F୅, shear forces Fୗ and bending moments M୆) results highlighted that shallow PGD can exert additional loads on pipelines that are proportional to the magnitude of the PGD. It has been found that the soil deformations as well as the internal forces induced on the pipeline ring are higher for rigid pipelines. Moreover, the results indicated that rigid pipelines are more effective than flexible ones as far as ovalization-serviceability limit state is concerned. In effect, for PGD magnitudes of 0.5, 1 and 2 m, the ovalization values of the flexible pipeline are, respectively, higher by 23%, 21% and 18% than those calculated for the rigid pipeline. Through a simplified linear numerical simulation such as that presented in this study, engineers and planners could be guided to foresee the possible causes of pipeline leaks and the mechanisms of ruptures that lead very often to severe disruption of pipelines’ normal operation. KEYWORDS: Soil-structure interaction, Slope failure, Permanent ground deformation, Pipelines, Radial internal forces, Ovalization

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Protection Control Scheme and Evaluation of Effectson Pipeline Crossing beneath Landslide Area

Cited by 15 publications

References 20 publications

Effect of the Soft and Hard Interbedded Layers of Bedrock on the Mechanical Characteristics of Stabilizing Piles

Effect of the Soft and Hard Interbedded Layers of Bedrock on the Mechanical Characteristics of Stabilizing Piles

Study on Interaction Mechanism of Natural Gas Pipe-Landslide System Reinforced by Micropile Groups Based on Model Test

Numerical Investigation on Buried Pipelines Subjected to Permanent Ground Deformations Due to Shallow Slope Failure

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