Numerical analysis of soil deformation behind the reaction wall of an open caisson induced by horizontal parallel pipe-jacking construction

Sun, Yang; Su, Jingbo; Xia, Xiaohe; Zhang, Xu

doi:10.1139/cgj-2015-0024

Cited by 26 publications

(5 citation statements)

References 14 publications

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“…Figure also shows that the repeated load value can be used to control specimen slip at a stable value, that is, it will not increase with N . This state is a ratcheting shakedown state commonly observed in metallic materials and is a critical state that materials can reach after developing plasticity under repeated loading. It is apparent that this shakedown phenomenon also exists in reinforced concrete material under repeated loading.…”

Section: Test Results and Analysismentioning

confidence: 97%

Effect of structural features and loading parameters on bond in reinforced concrete under repeated load

Sun

et al. 2017

Structural Concrete

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Some reinforced concrete structures are subjected to repeated loads during their service lives, and the effect of repeated loads is stronger and more complex than static loads. This paper reports the results of the tests performed on cylindrical reinforced concrete specimens under uniaxial repeated loads. The effect of structural parameters (e.g., stirrup configuration, bond length, confinement method, and concrete cover) and loading parameters (e.g., amplitude, peak load, loading rate, and initial load cycles) on the bond properties of the reinforced concrete under repeated loads was studied in detail. In addition, the degradation mechanisms and failure modes of the specimens' bond stress were analyzed. It is found that the use of stirrups, increase of bond length, and concrete cover, as well as confinement can effectively curb the widening and expansion of cracks in concrete and significantly improve ductility and repeated load bearing capability. As the rigidity of confinement material increased, the enhancement effect of confinement on bond stress increases. Compared to the role of confinement (e.g., carbon fiber reinforced polymer), increasing the concrete cover can more effectively improve the bond stress. The rebar's subsequent residual bond stress declines as the number of early-stage load cycle increases.bond stress, load parameter, reinforced concrete, repeated load, structural feature | INTRODUCTIONReinforced concrete structures will bear various types of loads, among which constantly repeated loads during normal usage. These loads can include vehicle loads on bridges, elevated roads and underground railway tunnels, vibration loads on industrial structures, wind loads on ocean engineering constructions, and wave loads on harbor constructions. [1][2][3][4][5][6] The effect of repeated loads on the operational properties of concrete structures is more intense and complex than that of static loads. With an increasing number of load cycles, damage accumulates in the bond of the reinforced concrete, and slip occurs between the rebar and the concrete, leading to increased structural deflection, reduced strength, and even sudden failure. An effective, scientific evaluation of the accumulated level of a structure's damage in a repeated load environment and an understanding of the degradation mechanism of the bond stress between the rebar and concrete under repeated loading would enable prompt and effective strengthening and repair measures to slow the structural damage process.Because of the heterogenic nature of concrete materials and the complexity of repeated loads, performance tests are the most commonly employed means of investigating this problem. Rehm and Elingehausen 7 showed that rebar diameter and concrete strength had no effect on bond fatigue life; with an increasing number of load cycles, rebar slip was related to not only load cycles but also stress levels and loading rates, and the effect of load cycles on the ultimate bond stress was relatively small. Balazs 8 reported that the slip rate tended...

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Section: Test Results and Analysismentioning

confidence: 97%

Effect of structural features and loading parameters on bond in reinforced concrete under repeated load

Sun

et al. 2017

Structural Concrete

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“…As for the stress and deformation of the back wall under the reaction of pipe jacking, some scholars studied the relationship between the earth pressure and jacking force in the process of pipe jacking [12,13]. Sun et al [14,15] studied the influence of the thickness of the reaction wall, the elastic modulus of the soil, and the position of the reaction on the soil deformation. Gong et al [16] considered the friction resistance of the bottom and side walls of the caisson and calculated the soil reaction based on the relationship between the displacement and earth pressure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pipe-Jacking Reaction on Earth Pressure of Back Wall of Pilot Tunnel of Subway Station

et al. 2023

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The study of the distribution form and calculation method of the earth pressure on the back wall of a pilot tunnel under a jacking reaction is very important to ensure the safety and smooth construction of the pipe jacking. Based on a metro station in Shenyang, this paper firstly investigates the effects of the changes in the jacking reaction parameters, such as the loading intensity, loading position, and loading area on the earth pressure and the displacement of the back wall in a pilot tunnel through numerical simulation, and then proposes a formula for calculating the soil reaction on the back wall and verifies it by comparison with the FEA (finite element method) results. The results show that the earth pressure distribution pattern of the back wall is similar to the normal distribution curve under the action of the jacking reaction. The horizontal displacement and earth pressure of the back wall will gradually increase with the increase in the jacking reaction. The horizontal displacement of the back wall is greatest when the load is applied to the middle wall, followed by the top wall and the bottom wall. The maximum horizontal displacement is reduced by approximately 24.25% when the loading position changes from the middle to the bottom. As the loading area increases, the maximum horizontal displacement of the back wall decreases, in the order of 11.8% and 14.45% relative to the previous level. The earth pressure of the back wall also decreases, in the order of 17.92% and 22.76% relative to the previous level. The equations presented are applicable to the calculation of the soil reaction in the limit state.

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“…In municipal infrastructures, it is usually necessary to construct a small, temporary, shallow shaft, such as a working shaft, for pipe jacking and pipe maintenance [1,2]. These temporary shafts are generally supported by reinforced concrete structures, which include reinforced concrete caissons, diaphragm walls, row piles, shotcrete and steel arch frame supports [3][4][5][6][7]. The disadvantages of these methods include a long duration for concrete curing [8,9], high costs, complicated construction procedures, environmental pollution [10], and resource waste [11,12], due to unrecyclable components.…”

Section: Introductionmentioning

confidence: 99%

Test Study on the Stress and Deformation Behaviors of a Shaft Supported by a Prefabricated Prestressed Structure

et al. 2019

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Soil deformation control is the key to shaft support. To better control soil deformation, improve construction efficiency, and reduce pollution, this study proposed a prefabricated prestressed supporting structure. The structure consisted of prefabricated steel structure units and special prestressed components. The structure units were applied to retain the soil. The screws were used for prestressing. Field prototype tests were conducted to assess the support effects and analyze the stress and deformation behaviors of the shaft. The earth pressure, the stress in the structure unit, and the lateral displacement of the soil were monitored. The measured earth pressure varied between the earth pressure at rest and the passive earth pressure. The stress of the supporting structure was far less than the yield strength of steel. Changes in the earth pressure and structural stress can be divided into four stages: rapid attenuation, fluctuation, slow change, and stabilization. Both the earth pressure and the structure stress completed the major attenuation within three days of prestressing. The surrounding soil moved out from the shaft under prestress conditions and exhibited an obvious space-time effect. The study of stress and deformation provides guidance for the construction of newly prefabricated prestressed structures.

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Numerical analysis of soil deformation behind the reaction wall of an open caisson induced by horizontal parallel pipe-jacking construction

Cited by 26 publications

References 14 publications

Effect of structural features and loading parameters on bond in reinforced concrete under repeated load

Effect of structural features and loading parameters on bond in reinforced concrete under repeated load

Influence of Pipe-Jacking Reaction on Earth Pressure of Back Wall of Pilot Tunnel of Subway Station

Test Study on the Stress and Deformation Behaviors of a Shaft Supported by a Prefabricated Prestressed Structure

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