Recommendations for determining nonlinear Winkler spring parameters for buried steel pipe stress analysis applications

Kouretzis, George; Wu, Jinbiao

doi:10.1016/j.compgeo.2021.104196

Cited by 10 publications

(3 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, it was stipulated that Δ qd was taken as 0.1D for pipe in medium sand, and taken as 0.2D in dense sand. However, Wu et al 31 and Kouretzis and Wu 32 raised that the sand will densify during downwards movement of the pipe, and Δ qd is the function of underlying soil density. Indeed, the diameter of the shield tunnel is considerably lager than that of the pipe.…”

Section: Coefficient Of Subgrade Modulusmentioning

confidence: 99%

Analytical prediction for longitudinal deformation of shield tunnel subjected to ground surface surcharge considering the stiffness reduction

Cao,

Liang,

Kang

et al. 2023

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

This paper presents an improved longitudinal beam‐spring model on the Vlasov foundation for estimating the longitudinal deformation of the shield tunnel when subjected to the ground surface surcharge. This model incorporates an improved subgrade modulus and treats each segmental ring as a Timoshenko short beam, with each circumferential joint modeled by two mechanical springs. It can accurately reflect the discontinuous deformation, and capture the dislocation and opening deformation of shield tunnels. Two‐stage analysis methodology is adopted to consider soil and tunnel interaction. The feasibility of this model is verified by comparing it with two well‐documented field monitoring cases. The computed results are also compared with those based on other analytical models. The results show that the Timoshenko continuous beam overestimates the dislocation deformation, while underestimates the opening deformation. In addition, the settlement curve exhibits neither smooth nor differentiable features. Finally, this paper also conducted some parameter analysis to examine the impact on tunnel deformation, encompassing dimensions of ground surface surcharge, the dual‐area loading, and the joint reinforcement. This approach provides valuable insights into how the deformation characteristics of shield tunnels are influenced by ground surface surcharge.

show abstract

Section: Coefficient Of Subgrade Modulusmentioning

confidence: 99%

Analytical prediction for longitudinal deformation of shield tunnel subjected to ground surface surcharge considering the stiffness reduction

Cao,

Liang,

Kang

et al. 2023

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…The industry-standard ALA Guidelines are typically used to estimate the soil spring properties. The basic inherent assumptions are that (1) the pipe is buried in uniform, dry, or fully saturated backfill, (2) the soil mechanical properties are independent of the stress level, and (3) the soil failure can freely develop, while the burial depth until the results are reliable is unknown (Kouretzis and Wu 2021).…”

Section: Beam-type Modelmentioning

confidence: 99%

“…Finally, the recent study of Kouretzis and Wu (2021) presents a comprehensive and complete set of recommendations for the estimation of the lateral and vertical soil spring properties based on a set of new experimental results by Ansari et al (2018). The updated expressions take into account the dependency of sand properties on the confining stress levels.…”

mentioning

confidence: 99%

Onshore Buried Steel Fuel Pipelines at Fault Crossings: A Review of Critical Analysis and Design Aspects

Melissianos

2022

J. Pipeline Syst. Eng. Pract.

View full text Add to dashboard Cite

Onshore buried steel pipeline infrastructure is a critical component of the fuel supply system. Pipeline failure due to seismic actions is socially, environmentally, and economically unacceptable and thus the design of pipelines at geohazard areas, such as fault crossings, remains a hot topic for the pipeline community. There is an intense research effort on the evaluation of the pipeline mechanical behavior and the strength verification at fault crossings. Still, some aspects need in-depth consideration concerning practical applications. A state-of-the-art review is presented on three critical analysis and design aspects, namely the calculation of the design fault displacement via deterministic and probabilistic methods, the effect of numerical modeling parameters such as soil spring properties, and the alternative pipe protection measures in terms of availability, efficiency, and selection process. The critical review offers a thorough insight on what is available and how to employ it in design, assisting engineers and pipe operators in improving pipe safety.

show abstract

A Labor-Saving Method of Pipe Uplifting Countermeasure with Geocell-Geotextile Combination

Nagatani,

Sawada,

Ikebata

et al. 2024

Transp. Infrastruct. Geotech.

View full text Add to dashboard Cite

In this study, we proposed a new method which mitigates pipe uplifting by utilizing geocells and geotextiles. The method resulted in labor saving in construction. To verify the effectiveness of the proposed method, we reproduced pipe uplift by conducting push-up tests using a 150-mm-diameter pipe. The test results showed that the proposed method increased the peak resistance and the resistance at large displacement by 1.47 and 3.35 times, respectively, compared to the unreinforced method. The proposed method also increased the peak resistance by 1.13 times compared to the conventional method widely used in Japan. It demonstrated consistently high resistance even after the peak. This indicated that the proposed method is very effective as a countermeasure against pipe uplift. Furthermore, increasing the overall width of the geocell improved the resistance. In this study, two different approaches were used to evaluate the uplift resistance of the pipe. The approaches showed that, with geocell reinforcement, most of the dead weight at the pipe sides and above them contributed to the peak resistance. It was also found that the peak resistance of the proposed method can be predicted to some extent by modifying the previously proposed equation.

show abstract

Recommendations for determining nonlinear Winkler spring parameters for buried steel pipe stress analysis applications

Cited by 10 publications

References 19 publications

Analytical prediction for longitudinal deformation of shield tunnel subjected to ground surface surcharge considering the stiffness reduction

Analytical prediction for longitudinal deformation of shield tunnel subjected to ground surface surcharge considering the stiffness reduction

Onshore Buried Steel Fuel Pipelines at Fault Crossings: A Review of Critical Analysis and Design Aspects

A Labor-Saving Method of Pipe Uplifting Countermeasure with Geocell-Geotextile Combination

Contact Info

Product

Resources

About