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Nonlinear Response of tunnel portal under Earthquake Waves with Different Vibration Directions

Computer Modeling in Engineering & Sciences 2022年第6期131卷 1289-1314页

作者： Hongyun Jiao Mi Zhao Jingqi Huang Xu Zhao Xiuli Du Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing100124China Beijing Key Laboratory of Urban Underground Space Engineering School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit Beijing University of TechnologyBeijing100124China

tunnel portal sections often suffer serious damage in strong earthquake *** waves may propagate in different directions,producing various dynamic responses in the tunnel *** on the Galongla tunnel,which is located in a seismic region of China,three-dimensional seismic analysis is conducted to investigate the dynamic response of a tunnel portal subjected to earthquake waves with different vibration *** order to simulate the mechanic behavior of slope rock effectively,an elastoplastic damage model is adopted and applied to ABAQUS software by a self-compiled user material(UMAT)***,the seismic wave input method for tunnel portal is established to realize the seismic input under vertically incident earthquake waves with different vibration directions,e.g.,S waves with a vibration direction perpendicular or parallel to the tunnel axis and P waves with a vibration direction perpendicular to the tunnel *** numerical results indicate that the seismic response and damage mechanisms of the tunnel portal section are related to the vibration direction of the earthquake *** vertically incident S waves running perpendicular to the tunnel axis,the hoop tensile strain at the spandrel and arch foot and the hoop shear strain at the vault and arch bottom are the main contributors to the plastic damage of the *** strain is initially concentrated around the tunnel foot and spandrel,before shifting to the tunnel vault and bottom farther away from the tunnel *** vertically incident S waves running parallel to the tunnel axis,very large hoop shear strain and plastic damage appear at the tunnel *** strain first increases and then decreases with distance from the tunnel *** vertically incident P waves running perpendicular to the tunnel axis,the maximum damage factor of the slope rock and the maximum plastic strain of the tunnel are significantly lower than for S ***,with increasing dista

关键词： tunnel portal earthquake dynamic numerical analysis vibration direction elastoplastic damage model seismic input method

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Key Technology of Reverse Excavation at tunnel portal

Key Technology of Reverse Excavation at Tunnel Portal

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作者： Yuwen Wang Zhao Hu Yongli Xie Chao Wang Kaicheng Hua Jinxing Lai Hongpeng Lai Yaqiong Wang Xiabing Yue Guangdong Huiqing Expressway Co. Ltd. School of Highway Chang’an University

tunnel portal construction is often from the outside to the inside of the *** special conditions and requirements,it is necessary to construct from the inside to the outside of the *** method is called reverse excavation in tunnel *** ensure the construction safety in reverse excavation,the stress and deformation characteristics of both forward excavation methods and reverse excavation methods were studied by numerical *** results show that reverse excavation could not significantly increase the deformation and stress of surrounding rock,and even reduced the influence range of tunnel excavation on the stress and deformation of *** excavation could also reduce the damage to the portal *** the tunnel was about to be cut through,in order to reduce the stress concentration on the slope,the final excavation length was recommended to being greater than 2.5 *** excavation was a kind of green construction.

关键词： tunnel engineering tunnel portal reverse excavation numerical experiment

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Rockfall Hazard Alarm Strategy Based on FBG Smart Passive Net Structure

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Photonic Sensors 2015年第1期5卷 19-23页

作者： Sheng LI Junjie MA Jun HU National Engineering Laboratory for Fiber Optic Sensing Technology Wuhan University of Technology Wuhan430070 China Wuhan WUTOS Limited Company Wuhan 430223 China Key Laboratory of Fiber Optic Sensing Technology and Information Processing Ministry of Education WuhanUniversity of Technology Wuhan 430070 China

In order to realize working state remote monitoring for a passive net, alarm timely and correctly for the rockfall invasion, and solve the disadvantages in the existing means, such as needing power supply in situ, vulnerability to electromagnetic interference and environmental climate impact, a smart passive net structure based on the optical fiber sensing technology was designed which equipped with intercepting and sensing functions. The wire rope net as one part of the smart passive net was weaved with two kinds of optical fiber sensing elements, namely, fiber Bragg grating （FBG） perimeter severity sensors and optical fiber monitoring net with each end of the tail fiber containing an FBG probe. Based on the proposed smart structure, a combination alarm strategy for rockfall was proposed, which can distinguish transmission bug, whether the rockfall invasion or net broken occurs. Through a designed simulation test, the effectiveness of the proposed alarm strategy was certificated.

关键词： Passive net rockfall hazard fiber Bragg grating disaster alarm strategy tunnel portal

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