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Yichao Ye
School of Civil Engineering, Central South University, 22 Shaoshan Road, Changsha 410075, China

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Research article
Published: 28 October 2020 in Advances in Civil Engineering
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The electromechanical impedance (EMI) technique based on the PZT transducer, in the past twenty years of research progress, has demonstrated its potential for cost-effective and high damage-sensitive structural health monitoring. This paper presents an application of EMI technique for damage evolution investigation of initial damaged tunnel invert concrete under high traffic cyclic loading. In the tests, six different levels of initial damage inside the specimens, as the influencing factor, were firstly created by applying a certain number of impacts with a free-falling iron ball. Then, these specimens were applied typical mechanical boundaries similar to that of tunnel invert concrete by an installation specially designed. Finally, the traffic cyclic loading carefully determined was exerted by the MTS815 hydraulic zero-control testing system, to investigate the evolution characteristic of piezoelectric signature of the PZT sensor. The experimental result shows that the conductance signature follows a consistent rightward shifting with the number of cycles increasing, and the larger the initial damage of the specimen, the more obvious the rightward shifting. It indicates that, in general, the traffic cyclic loading is not large enough to make the microcracks propagate to fatigue failure in tunnel invert concrete even if there is a large initial damage. On the contrary, with special mechanical boundaries, the local nominal stiffness of tunnel invert concrete will gradually increase. This phenomenon may be interpreted as an effect of generalized damage recovery. A new damage index, with values between 0 and 1, was then defined to quantify the damage level for quantitative analysis. It was found that the damage recovery behaviors for different initial damaged specimens can be well and uniformly described by an empirical expression, which may be helpful for the damage assessment of tunnel invert concrete under high traffic cyclic loading in the future.

ACS Style

Yichao Ye; Limin Peng; Yuexiang Lin; Jianwen Liu; Mingfeng Lei; Ruizhen Fei. EMI Technique for Monitoring the Damage Evolution of Initial Damaged Tunnel Invert Concrete Subjected to High Traffic Cyclic Loading. Advances in Civil Engineering 2020, 2020, 1 -18.

AMA Style

Yichao Ye, Limin Peng, Yuexiang Lin, Jianwen Liu, Mingfeng Lei, Ruizhen Fei. EMI Technique for Monitoring the Damage Evolution of Initial Damaged Tunnel Invert Concrete Subjected to High Traffic Cyclic Loading. Advances in Civil Engineering. 2020; 2020 ():1-18.

Chicago/Turabian Style

Yichao Ye; Limin Peng; Yuexiang Lin; Jianwen Liu; Mingfeng Lei; Ruizhen Fei. 2020. "EMI Technique for Monitoring the Damage Evolution of Initial Damaged Tunnel Invert Concrete Subjected to High Traffic Cyclic Loading." Advances in Civil Engineering 2020, no. : 1-18.

Journal article
Published: 09 June 2020 in Advances in Civil Engineering
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This paper aims to provide a new approach to predict the friction resistance of slurry pipe jacking. Friction force usually constitutes the main component of jacking force. It can be calculated by multiplying an effective friction coefficient and the normal force acting on the external surface of the pipe. This effective friction coefficient is introduced to reflect the effect of contact state of pipe soil slurry, highly affected by the effect of lubrication and the interaction of pipe soil slurry. Firstly, by making some reasonable assumptions, the analytical formula of the effective friction coefficient is obtained, in which the critical quantity of contact (contact angle or width) is calculated by using the Persson contact model. Then, the analytical formula of normal force of circular pipeline is derived, which needs to determine the vertical soil pressure. To allow for a better prediction, three typical silo models are introduced and compared. Finally, a method for calculating the friction resistance of slurry pipe jacking is established. The main difference from the existing method is that this method takes into full consideration the influence of lubrication, soil properties (such as internal friction angle, cohesion, and void ratio), and design parameters (such as buried depth, overcut, and pipe diameter). By using reasonable silo models, the predicted results are in good agreement with the measured values collected from 10 in situ cases, which proves that the new approach can provide accuracy prediction of friction resistance for slurry pipe jacking with various soil conditions, and it may help for better future design and less construction costs.

ACS Style

Yichao Ye; Limin Peng; Weichao Yang; Yang Zou; Chengyong Cao. Calculation of Friction Force for Slurry Pipe Jacking considering Soil-Slurry-Pipe Interaction. Advances in Civil Engineering 2020, 2020, 1 -10.

AMA Style

Yichao Ye, Limin Peng, Weichao Yang, Yang Zou, Chengyong Cao. Calculation of Friction Force for Slurry Pipe Jacking considering Soil-Slurry-Pipe Interaction. Advances in Civil Engineering. 2020; 2020 ():1-10.

Chicago/Turabian Style

Yichao Ye; Limin Peng; Weichao Yang; Yang Zou; Chengyong Cao. 2020. "Calculation of Friction Force for Slurry Pipe Jacking considering Soil-Slurry-Pipe Interaction." Advances in Civil Engineering 2020, no. : 1-10.

Journal article
Published: 22 May 2020 in Tunnelling and Underground Space Technology
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The running safety risk of a high-speed train (HST) deteriorates remarkably under crosswind when the train drives into a bridge from a tunnel (OUT) or from a bridge into a tunnel (IN). This study aims to reveal the difference in the aerodynamic performance of HSTs in the two processes in terms of transient aerodynamic loads and flow field. A calculation approach for aerodynamic loads in which the carriage surface is divided into segments in longitudinal and circumferential directions is proposed to obtain the real-life time history of aerodynamic loads. The main results can provide a theoretical basis for traffic safety command when HSTs run in an infrastructure scenario consisting of tunnel–bridge–tunnel (ISTBT). In the presence of crosswinds, the maximum fluctuation amplitudes of five aerodynamic coefficients in the processes ‘OUT’ and ‘IN’ are increased by 2.1–83.8 and 4.0–84.3 times, respectively. The fluctuation amplitudes of five aerodynamic coefficients in the process ‘IN’ are generally 1.01–2.32 times larger than those in the process ‘OUT’ in a crosswind environment. A large resultant wind angle causes the fluctuation amplitudes in the five aerodynamic coefficients in the process ‘IN’ to be larger than those in the process ‘OUT’. The maximum fluctuation amplitude of aerodynamic coefficients in leading and tail carriages is the key to controlling traffic safety when HSTs run in ISTBT in a crosswind environment.

ACS Style

E Deng; Weichao Yang; Xuhui He; Yichao Ye; Zhihui Zhu; Ang Wang. Transient aerodynamic performance of high-speed trains when passing through an infrastructure consisting of tunnel–bridge–tunnel under crosswind. Tunnelling and Underground Space Technology 2020, 102, 103440 .

AMA Style

E Deng, Weichao Yang, Xuhui He, Yichao Ye, Zhihui Zhu, Ang Wang. Transient aerodynamic performance of high-speed trains when passing through an infrastructure consisting of tunnel–bridge–tunnel under crosswind. Tunnelling and Underground Space Technology. 2020; 102 ():103440.

Chicago/Turabian Style

E Deng; Weichao Yang; Xuhui He; Yichao Ye; Zhihui Zhu; Ang Wang. 2020. "Transient aerodynamic performance of high-speed trains when passing through an infrastructure consisting of tunnel–bridge–tunnel under crosswind." Tunnelling and Underground Space Technology 102, no. : 103440.

Journal article
Published: 26 December 2019 in Applied Sciences
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The new approach established in this paper can provide accuracy prediction of friction resistance for slurry pipe jacking with various soil conditions, which lays a good foundation for better future design and less construction costs.

ACS Style

Yichao Ye; Limin Peng; Yang Zhou; Weichao Yang; Chenghua Shi; Yuexiang Lin. Prediction of Friction Resistance for Slurry Pipe Jacking. Applied Sciences 2019, 10, 207 .

AMA Style

Yichao Ye, Limin Peng, Yang Zhou, Weichao Yang, Chenghua Shi, Yuexiang Lin. Prediction of Friction Resistance for Slurry Pipe Jacking. Applied Sciences. 2019; 10 (1):207.

Chicago/Turabian Style

Yichao Ye; Limin Peng; Yang Zhou; Weichao Yang; Chenghua Shi; Yuexiang Lin. 2019. "Prediction of Friction Resistance for Slurry Pipe Jacking." Applied Sciences 10, no. 1: 207.

Research article
Published: 30 September 2019 in Advances in Civil Engineering
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Dewatering using the dewatering systems composed of diaphragm walls and pumping wells is commonly adopted for deep excavations that are undertaken in deep aquifers. However, dewatering can sometimes induce environmental problems, especially when diaphragm walls cannot effectively cut off the aquifers. This paper mainly presents an innovative excavation technique combining dewatering excavation and underwater excavation without drainage, which is employed for a deep shaft excavation in ultrathick aquifers (up to 60–70 m thick aquifer) in Fuzhou, China. The shaft excavation with the depth of 41.6 m below the ground surface (BGS) is divided into two major phases, that is, (1) the first part of the excavation (the depth of 23.6 m BGS) is conducted by the way of conventional dewatering and braced excavation (Phase I) and (2) the second excavation with the depth of 23.6 m to 41.6 m BGS is carried out by the novel underwater excavation without drainage technique (Phase II). Field monitoring results show that the ratios of maximum ground surface settlement δvm to the excavation depth He in this case ranged from 0.03% to 0.1%. Most of the ratios of maximum lateral wall deflection δhm to excavation depth He are less than 0.1%. All these results are lesser than that predicted by empirical methods, which also confirmed the applicability of this innovative excavation. Thus, this innovative solution can be applicable to other deep excavations that are undertaken in ultrathick aquifers, especially for the excavation of coarse sediments with high permeability.

ACS Style

Chengyong Cao; Chenghua Shi; Linghui Liu; Jianwen Liu; Mingfeng Lei; Yuexiang Lin; Yichao Ye. Novel Excavation and Construction Method for a Deep Shaft Excavation in Ultrathick Aquifers. Advances in Civil Engineering 2019, 2019, 1 -15.

AMA Style

Chengyong Cao, Chenghua Shi, Linghui Liu, Jianwen Liu, Mingfeng Lei, Yuexiang Lin, Yichao Ye. Novel Excavation and Construction Method for a Deep Shaft Excavation in Ultrathick Aquifers. Advances in Civil Engineering. 2019; 2019 ():1-15.

Chicago/Turabian Style

Chengyong Cao; Chenghua Shi; Linghui Liu; Jianwen Liu; Mingfeng Lei; Yuexiang Lin; Yichao Ye. 2019. "Novel Excavation and Construction Method for a Deep Shaft Excavation in Ultrathick Aquifers." Advances in Civil Engineering 2019, no. : 1-15.