Investigation of Ground Displacement Induced by Hydraulic Jetting Using Smoothed Particle Hydrodynamics

Njock, Pierre Guy Atangana; Shen, Shui-Long

doi:10.1007/978-981-13-0122-3_8

Cited by 3 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This paradigm particularly suits for the jetting-induced trenching operation because it enables the modeling of saturated soils at a particulate level, as well as the interaction among particles. Besides, this realistic modeling approach has the prominent aptitude to allow the qualitative and quantitative motoring of the phenomenon variabilities [150][151][152][153][154][155][156][157][158][159][160]. fluctuation, soil particulate nature, multiphase soils, etc.).…”

Section: Smoothed Particle Hydrodynamics (Sph)mentioning

confidence: 99%

Perspective Review on Subsea Jet Trenching Technology and Modeling

Njock

Zheng

Zhang

et al. 2020

JMSE

View full text Add to dashboard Cite

This paper presents a comprehensive review on subsea jet trenching technology via a critical analysis of its principle, mechanism, devices, modeling approaches, as well as properties of subsea sediments. This review shows that the success of jet trenching operations is closely related to some key factors including the soil conditions, trencher specifications, and characteristics of pipelines or cables. Three case histories are presented to demonstrate the importance of these key factors and their interrelationships. This paper also points out a number of challenges pertaining to the implementation of the jet trenching method in carbonate sediments, as well as some limitations and gaps in the existing modeling approaches. Future perspective researches that are recommended to develop: (1) promising theories, like turbulent submerged flow, and (2) robust numerical approaches, such as the smoothed particle hydrodynamics (SPH) and material point method (MPM) to substantiate the experimental experience and reveal possible hidden mechanisms.

show abstract

Section: Smoothed Particle Hydrodynamics (Sph)mentioning

confidence: 99%

Perspective Review on Subsea Jet Trenching Technology and Modeling

Njock

Zheng

Zhang

et al. 2020

JMSE

View full text Add to dashboard Cite

show abstract

“…Because the SPH (smoothed particle hydrodynamics) theory does not have a fixed grid, it has strong adaptability to problems such as fluid dynamics and large structural deformations. The theory is used to analyze engineering problems such as ground displacement caused by hydraulic jets [16], the flow of fresh concrete [17] and pile-soil interaction [18]. Li et al [19] introduced the SPH method into the numerical simulation of synchronous grouting in a shield tunnel [20] and analyzed the diffusion mechanism and related parameters of synchronous grouting slurry during shield tunneling, as well as the large deformation characteristics and dynamic response of the soil and grouting body [21].…”

Section: Introductionmentioning

confidence: 99%

Secondary Grouting Pressure Limit of Shield Tunnels in Loess Strata Based on Bolt Shear Behavior

Feng

Wen

et al. 2022

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

A loess stratum was selected as the research object, assuming that the slurry diffuses in a hemispherical shape during secondary grouting. Based on the unified strength theory describing the failure characteristics of loess and the critical condition of bolt shear failure, the critical pressure value of the secondary grouting in loess strata was determined theoretically. The reliability of the theoretical analysis was verified by the numerical modeling realizing the large deformation of formation and the dynamic injection of slurry. The critical grouting pressure of 821.80 kPa of theoretical calculation was obtained. Comparing the results of the numerical simulation analysis, it was found that the critical grouting pressure calculated using the theoretical equation had a safety index of 1.14. Bounded by βu (the ratio of expansion radius RP of soil plastic zone to the expansion radius Ru of the slurry) equal to 2.65, the water pressure at the grouting port is the main factor affecting the upper limit of critical grouting pressure when it is less than 2.65, and the effective internal friction angle of soil layer is the main factor when it is greater than 2.65. The influence of matric suction on the upper limit of the critical grouting pressure can be ignored.

show abstract

High‐Fidelity Data Augmentation for Few‐Shot Learning in Jet Grout Injection Applications

Atangana Njock,

Yin,

Zhang

2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Contemporary geoengineering challenges grapple with the plateauing of both existing algorithms and their depth of insights, a phenomenon exacerbated by the scarcity of high‐fidelity data. Although existing solutions such as Monte‐Carlo method can generate abundant data, they are not sufficiently robust for ensuring the high fidelity of data. This study proposes a novel data augmentation framework that combines statistical and machine learning methods to generate high‐fidelity synthetic data, which closely align with field data in terms of the statistical and empirical attributes. The innovations of the proposed approach lie in the integration of Copulas theory for data generation, a developed geo‐regression anomaly detection (GRAD) for adjusting data attributes, and an evolutionary polynomial regression for data consistency enforcement. The multilayer perceptron (MLP) and a wide‐and‐deep (WaD) networks are applied to assess the effectiveness of high‐fidelity data augmentation using jet grouting data. The outcomes reveal the robustness of the synthetic data generation framework, achieving satisfactory fidelity in both empirical and statistical attributes. The proposed data augmentation improved the R2 and MAE achieved by MLP and WaD up to 28.37% under data fractions ranging from 0.2 to 1. MLP and WaD yielded comparable results in terms of accuracy and generalization ability across various augmented fractions. This indicates that the accuracy of synthetic data plays a pivotal role, suggesting improving data quality can be highly effective in boosting performance, regardless of the model complexity. This study contributes valuable insights to addressing the challenges of scare high‐fidelity data in geoengineering.

show abstract

Investigation of Ground Displacement Induced by Hydraulic Jetting Using Smoothed Particle Hydrodynamics

Cited by 3 publications

References 13 publications

Perspective Review on Subsea Jet Trenching Technology and Modeling

Perspective Review on Subsea Jet Trenching Technology and Modeling

Secondary Grouting Pressure Limit of Shield Tunnels in Loess Strata Based on Bolt Shear Behavior

High‐Fidelity Data Augmentation for Few‐Shot Learning in Jet Grout Injection Applications

Contact Info

Product

Resources

About