Evaluation of the NATM tunnel load on concrete lining using the ground lining interaction model

Jeong, Sang Seom; Han, Young Chul; Kim, Yong Min; Kim, Do Hyun

doi:10.1007/s12205-014-0597-9

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…According to the numerical results, the order of load‐sharing ratio by pile location is interior → center → side → corner. On the basis of the results and numerous studies, it was found that the load‐sharing ratio of PRD piles due to different locations in the footing follows a similar tendency of footing settlement due to axial loading …”

Section: Parametric Studymentioning

confidence: 92%

“…was used for numerical analysis. The PLAXIS 3D Foundation is widely used in geotechnical engineering, and the accuracy of this program was confirmed through various geotechnical engineering issues . In addition, the PLAXIS 3D Foundation can be easily adapted in modeling multistory structures with piled‐raft foundation and can observe the acting load on top of each individual pile.…”

Section: D Fe Modeling and Analysismentioning

confidence: 97%

“…Therefore, three types of soils were adopted to analyze the changes of the load‐sharing ratio under various soil conditions. The material properties were adopted from some typical values based on the results of a soil investigation in field cases as reported by Seol et al, Cho et al, and Jeong et al The soft rock in this analysis is assumed as equivalent to a rock mass rating of fourth‐grade rock, and the hard rock is equivalent to a second‐grade rock. An isotropic elastic model was used for the mat foundation, beam, and column, and the material behavior of the soil and rock was modeled with a Mohr–Coulomb model.…”

Section: D Fe Modeling and Analysismentioning

confidence: 99%

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Load‐sharing ratio of prebored and precast pile in top‐down method construction process

Kim

Jeong

Jung

et al. 2018

Structural Design Tall Build

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Summary The load‐sharing ratio of the prebored and precast pile in top‐down method foundation was investigated by using a numerical analysis and field case study. The emphasis was on quantifying the apparent load‐sharing ratio of the prebored and precast pile during the top‐down method construction process. A series of three‐dimensional finite element analysis were conducted, with special attention given to the pile load‐sharing ratio under various conditions, such as soil condition, pile geometry, pile length, and structure load. In addition, the load‐sharing ratio of a single pile was also investigated based on the location of the pile in the raft (footing). The analysis model was validated by comparing the analysis model with the field data of an actual construction site using the prebored and precast pile and the top‐down method. On the basis of the series of analysis results and the field measurements, when the soil condition is better than weathered rock and for moderate pile length, at least 15% of the total structure load was supported by the pile throughout the construction process. Furthermore, it was shown that the pile near the center of the raft carried more structure load compared with the piles in the side and the corner of the raft.

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Section: Parametric Studymentioning

confidence: 92%

Section: D Fe Modeling and Analysismentioning

confidence: 97%

Section: D Fe Modeling and Analysismentioning

confidence: 99%

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Load‐sharing ratio of prebored and precast pile in top‐down method construction process

Kim

Jeong

Jung

et al. 2018

Structural Design Tall Build

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“…e primary problem is that the model itself is only an assumed distribution form, which cannot reflect the actual conditions experienced by the tunnel lining under the action of many influencing factors. Research regarding water-soil pressure under an external load acting on the lining is divided into water-soil separation algorithms and water-soil combination algorithms [6][7][8][9]. Among them, the study of earth pressure is mainly based on a simplified calculation method.…”

Section: Introductionmentioning

confidence: 99%

Model Test and Back Analysis of Shield Tunnel Load Distribution in Soft Clay

Niu

Weng

Tian

et al. 2021

Advances in Materials Science and Engineering

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Combined with the soft clay layer of Foshan metro, a back-analysis method combining model test and numerical simulation is developed. First, the similitude criterion for the model used in this study was derived from similarity theory and elasticity mechanics equations. Artificial clay is prepared by mixing kaolin, bentonite, loess, and river sand in proportions of 4 : 2: 3 : 1. Gypsum, water, and borax are mixed in proportions of 1 : 0.7 : 0.015 to simulate the tunnel lining. The model tests were carried out based on four load modes: the combination of mode 1, vertical load distribution and horizontal load linear distribution, mode 2, vertical load distribution and horizontal load parabolic distribution, mode 3, vertical load parabolic distribution and horizontal load linear distribution, and mode 4, vertical and horizontal load parabolic distribution. Then, the calculation model corresponding to the four load modes is established using ABAQUS, and the measured data is back-analyzed as the known quantity. The specific load values obtained were 359 kPa, 380 kPa, 361 kPa, and 368 kPa by the load-internal force curve. The bending moment and axial force are calculated by substituting the back-analysis load values back into the model and comparing the results with the measured values; it was found that the internal forces under the back-calculation load still deviated by varying degrees. By using the comprehensive error function E to evaluate the advantages and disadvantages of the four distribution modes, the comprehensive errors are 4.3%, 1.7%, 6.5%, and 5.9%, respectively. That is, the error of load distribution of mode 2 (the combination of vertical load distribution and horizontal load parabolic distribution) is the lowest and is highly consistent with the measured value, which is the closest to the characteristics of the load pattern of the stratum.

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“…Reznik [11] and Lai et al [12,13] analyzed the stress and deformation characteristics of tunnel structures caused by different water immersion scopes and discussed the mechanism of lining cracking. Jeong et al [14] analyzed the changes in the shear strength and compressive modulus of loess with water content variations and summarized the influence of law of loess water content on tunnel deformation. Shao et al [15] divided collapsible loess into environmental grades, which contributes to tunnel design.…”

Section: Introductionmentioning

confidence: 99%

Load Characteristics of Tunnel Lining in Flooded Loess Strata considering Loess Structure

Liu

Lai

2019

Advances in Civil Engineering

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Loess has a unique structure and water sensitivity, and the immersion of loess leads to many tunnel lining problems in shallowly buried tunnels. Based on a tunnel in Gansu Province in China, two failure glide planes of a shallowly buried loess tunnel and their immersion modes are summarized. Finite element calculation of the structural Duncan-Chang constitutive model is realized via the secondary development of finite element software, by which the loads on the secondary lining are calculated and verified in comparison with measured results. The load characteristics of the secondary lining are studied. The load evolution is closely related to the immersion position and scope of the load. After the loess near the failure glide plane of the arch foot is flooded, the load on the arch foot sharply increases. As the immersion expands, the maximum load moves from the arch end up to the hance. After the loess near the failure glide plane of the hance is flooded, the load on the hance decreases slightly. The stability of the overlying loess decreases gradually, which causes the loads on the vault and arch shoulder to rapidly increase. Additionally, the load distribution characteristics on the secondary lining are summarized.

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Evaluation of the NATM tunnel load on concrete lining using the ground lining interaction model

Cited by 16 publications

References 11 publications

Load‐sharing ratio of prebored and precast pile in top‐down method construction process

Load‐sharing ratio of prebored and precast pile in top‐down method construction process

Model Test and Back Analysis of Shield Tunnel Load Distribution in Soft Clay

Load Characteristics of Tunnel Lining in Flooded Loess Strata considering Loess Structure

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