| Author: | Wang, Shiguang |
| Title: | Monitoring and assessment of construction-induced vibration impact on surroundings |
| Advisors: | Zhu, Songye (CEE) |
| Degree: | Ph.D. |
| Year: | 2022 |
| Subject: | Vibration Environmental impact analysis Buildings -- Vibration Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Civil and Environmental Engineering |
| Pages: | xxix, 269 pages : color illustrations |
| Language: | English |
| Abstract: | Ground- and structure-borne vibrations due to construction activities can induce various levels of disruption or interference to nearby underground utilities, buildings, occupants, and ultraprecision equipment. In many densely populated metropolises, small separation distances from construction sites to vibration-sensitive objects intensify such adverse impact. Vibration impact assessment on surroundings has been investigated for decades. However, the existing literature still presents several limitations or areas that need improvement: (1) Insufficient attention has been paid to ground excavation works (e.g., rock excavation using hydraulic breakers) that may also induce excessive vibrations and adversely affect surroundings. (2) The existing vibration prediction models have various limitations. Accurate numerical models or engineering models require a great amount of execution time and sophisticated technical knowledge. Empirical models are comparatively easy to apply and require fewer input data; however, their accuracy cannot always be guaranteed because of the lack of a rigorous analytical basis. (3) Compared with commonly performed short-term vibration impact monitoring, whole-process or long-term monitoring and assessment has rarely been reported. (4) Typically applied on-site vibration control based on vibration monitoring at a few selected locations cannot estimate the vibration intensity at locations other than monitoring points. Given the above research limitations, the work presented in this thesis comprises two major sections: (1) Predictions of ground-borne vibrations and building vibrations induced by two common construction activities, namely, ground excavation using hydraulic breakers and impact pile installation. (2) Whole-process monitoring and assessment of construction-induced vibrations impact on ultraprecision equipment, and vibration source localization on construction sites to extend vibration intensity estimation from discrete monitored points to a global surrounding area. The main outcomes are listed as follows: (1) A new empirical formula was proposed to estimate the ground-borne vibration intensities induced by ground excavation using percussion methods (such as hydraulic breakers and jackhammers), including the quantification of surface and underground vibrations. (2) A novel estimation approach was proposed for ground-borne vibrations induced by impact pile driving, wherein a simplified pile-driving model was developed to calculate the ground-radiated energy caused by the equivalent soil damping effect at the pile-soil interface, and wave attenuation equations were adopted to predict the attenuation of vibration intensities with distance by considering the propagation nature of various wave types. (3) A new quantitative assessment framework was proposed to predict building vibrations induced by the short-duration impact generated by hydraulic breakers during ground excavation work. In particular, impedance-based prediction formulas were proposed to estimate the vibration coupling attenuation at column bases and the floor-to-floor vibration attenuation inside a building. (4) Whole-process monitoring and assessment of construction-induced vibration impact on ultraprecision equipment were conducted based on a tailor-made vibration monitoring and assessment system in a hospital expansion project. Various vibration mitigation measures were suggested to guarantee the functionality of vibration-sensitive medical equipment so that the continued medical services were not interrupted during the whole construction period. (5) Vibration source localization method was proposed to localize unknown vibration sources on construction sites based on the measured vibration signals at multiple vibration monitoring points by extending the time of arrival (ToA) method. Vibration intensity estimation at the entire construction site can be achieved by using the estimated vibration source locations and available empirical prediction models. Through a combination of empirical, numerical, and experimental studies, this thesis presents a systematic estimation of ground and structural vibrations induced by common construction activities. The outcomes of this thesis work can provide a useful guideline to the construction industry on the monitoring and assessment of construction-induced vibration impact on vibration-sensitive surroundings. They will also shed light on future measures for construction-induced vibration impact mitigation. Some challenges are also discussed based on the outcome of this thesis. |
| Rights: | All rights reserved |
| Access: | open access |
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