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- 저자 : Pengyuan Zhang (검색결과 3 건)
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A New Calculation Method for Tunneling-Caused Stratum Settlement
Junbao Wang,Pengyuan Zhou,Zhanping Song,Shihao Li,Qiang Zhang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.6
To improve the prediction accuracy for the stratum settlement induced by tunnels and obtain a theoretical method for determining the influence radius of settlement, a new empirical formula for the surface settlement curve is proposed in this study, and the slice method is introduced into the calculation of the influence radius of settlement. It is assumed that the disturbance boundary of the tunnel is a circular arc surface, the disturbed soil is divided into multiple slices, and the sliding force and resistance on the circular arc are obtained through a stress analysis of the slices. An arc with the same values of the sliding force and resistance can be determined as the actual disturbance boundary of the overlying strata as formed by the subsurface tunneling. On this basis, the influence radius of settlement and maximum settlement at different depths can be determined, and the settlement curve can be depicted by substituting the influence radius and maximum settlement into the expression of the settlement curve. The rationality of the proposed method is verified based on four sets of measured data. The surface settlement curves and the settlements at different depths on the center line of the tunnel obtained by the new method are generally consistent with the measured data.
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Stress-related energy dissipation and damping model of concrete considering moisture content
Liu, Baodong,Zhang, Pengyuan,Lyu, Wenjuan Techno-Press 2022 Advances in concrete construction Vol.13 No.6
Although the influence of moisture content on the mechanical properties of concrete has been studied for a long time, research related to its influence on the damping and energy dissipation property of concrete structure is still very limited. In this paper, the relationship between damping property and moisture content of concrete using cyclic uniaxial compression is firstly presented, and the mechanism of the influence of moisture content on concrete damping and energy dissipation capacity is analyzed. Based on the experimental research, moisture-related damping and energy dissipation model is proposed. Results show that the dissipated energy of concrete and loss factor increase as the moisture content increasing. The energy dissipation coefficient reflecting the influence of stress level of concrete under cyclic load, decreases first and then increases as the moisture content increasing. The mechanism of moisture-related energy dissipation behavior can be divided into the reactive force of water, the development of the internal micro cracks and the pore water pressure. Finally, the proposed moisture-related damping and energy dissipation model are verified.
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Zhengyi Xu,Pengyuan Zhang,Bo Zhang,Bing Lei,Zhiyuan Feng,Junyi Wang,Yawei Shao,Guozhe Meng,Yanqiu Wang,Fuhui Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
In this work, electrochemical hydrogen permeation tests were carried out to obtain the steady-statehydrogen permeation current of X70 pipeline steel in acid environment and alkaline electrolyte withapplied cathodic overpotentials simulating the service conditions of pipelines. It is shown that Lamicroalloyingcan efficiently reduce the steady-state hydrogen permeation current density while maintainingthe same mechanical performance. The experimental permeation data were fitted with Iyer-Pickering-Zamanzadeh (IPZ) and surface effect model to analyze the inhibitive mechanism on hydrogenpermeation, and the results depicted that La element on the material surface greatly facilitates the desorptionprocess of hydrogen atoms. In addition, the calculated hydrogen diffusion coefficient was foundsmaller after La microalloyed, which can be ascribed to the larger hydrogen trap density. It is suggestedthat La-microalloying can mitigate hydrogen damage of X70 pipeline steel in both acidic environment orunder cathodic protection.
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