Ground-borne environmental vibrations induced by railways, subway, roads traffic, machine foundations, constructions and so on give annoyance to the nearby residents and cause malfunction of the nearby sensitive equipments, although the vibration amplitude is very low (i.e. at micrometer level). It is essential to establish appropriate methods to assess such environmental vibrations and investigate the effectiveness of proposed vibration isolation techniques such as open and in-filled trenches; piles in row and wave impedance block (WIB), etc.
Objective:
1．To establish effective vibration isolation techniques and understand the fundamental mechanism of vibration isolation by ground barriers.
2. To propose appropriate theoretical and numerical methods to calculate the ground vibration with vibration isolation techniques and evaluate their effectiveness.
Approach:
Laboratory and field tests are performed to evaluate the effectiveness of various ground vibration isolation barriers, such as open and in-filled trenches, piles in row and wave impedance block (WIB), as well as the influencing factors. Meanwhile, 2.5 D finite element method and semi-empirical boundary element method are developed to evaluate the effectiveness of vibration isolation.
Significant Results and Potential Impact:
Theoretical analyses and field tests have been carried out successfully to investigate the effectiveness of WIB, piles in row and open and in-filled trenches in ground vibration isolation and the key parameters affecting their effectiveness are found. The proposed calculation methods provide effective ways to analyze their effectiveness. These results significantly improve the current state of the ground environmental vibration research.
Principal Investigator:
G.Y. Gao, S.J. Feng, F. Liu, X.Q. Gu
Funding:
◆National Natural Science Foundation of China: Investigating Environmental Vibration and Mitigation due to High-speed Railway in Saturated Soft Ground (51178342)
◆National Natural Science Foundation of China: Active Vibration Isolation by Wave Impedance Block (WIB) in Saturated Ground for Low-frequency Wave (50878155)
◆National Natural Science Foundation of China: Rayleigh Wave Scattering and Vibration Isolation by Wave Barriers in Saturated Layered Ground (50678128)
◆National Natural Science Foundation of China: Research and Controlling for Environmental Pollution due to Traffic Vibration (50178056)
◆Specialized Research Fund for the Doctoral Program of Higher Education of China: Dynamic Response and Environmental Vibration of Saturated Layered Ground Induced by Subway (20130072110016)
Key Publications:
1) Gao* G.Y., Chen Q.S., He J.F., Liu F. Investigation of ground vibration due to trains moving on saturated multi-layered ground by 2.5D finite element method. Soil Dynamics and Earthquake Engineering, 2012, 40: 87-98.
2) Gao M., Wang Y., Gao G.Y*, Yang J. An analytical solution for the transient response of a cylindrical lined cavity in a poroelastic medium, Soil Dynamics and Earthquake Engineering, 2013, 46: 30-40
3) Gao GY*, Song J, Yang J. Identifying the boundary between near field and far field in ground vibration caused by surface loading, Journal of Central South University of Technology, 2014, 21(8): 3284−3294
4) Gao M., Wang Y., Gao G.Y*. Dynamic response of cylindrical lined cavity in elastic medium, Journal of Central South University of Technology, 2013, 20(10): 2849-2855
5) Gao G.Y., Tutumluer E., Chen Y.M. Recent Advances in Environmental Vibration[C], Proc. of 6th International Symposium on Environmental Vibration, November 8-10, 2013, Shanghai, China, Shanghai: Tongji University Express, 2013.
6) Gao G.Y., Chen G.Q., Qiu C. Chapter 9: Vibration Isolation by Ground Barriers, Traffic Induced Environmental Vibrations and Controls: Theory and Application [M] (Editors: Xia H. & Calçada R.), Nova Science Publishers, Inc. 2013 (Web: www.novapublishers.com)
7) Gao G.Y.*, Shi G., Feng S.J., Qiu C. 3D analysis of in-filled trench as passive barriers for ground vibration isolation, Science in China Series G: Physics, Mechanics & Astronomy, 2008, 51(10): 1573-1585
8) Gao G.Y.*, Li Z.Y., Qiu C., Yue Z.Q. Three-dimensional analysis of rows of piles as passive barriers for ground vibration isolation. Soil Dynamics and Earthquake Engineering, 2006, 26(11): 1015-1027.
