In complex and sensitive environments, minimizing the disturbance of blasting vibration to surrounding residents is the primary concern during blasting construction. To explore a quantitative evaluation method for human dynamic response to blasting vibration, this study conducted single-subject in-situ blasting tests under strictly controlled safety conditions. By integrating digital image correlation (DIC) with a synchronous electrocardiogram (ECG) measurement system, the dynamic response characteristics of the human body surface under varying blasting vibration intensities were preliminarily analyzed. A height-dependent fitting relationship for peak particle velocity (PPV) was established under the present test conditions, with the body divided into two regions: below the waist and above the waist. Given the safety constraints of in-situ blasting tests, laboratory shake-table tests were also conducted. A comparative analysis using heart rate variability (HRV) evaluation indices was performed to preliminarily demonstrate the feasibility of using a shake table to simulate blasting vibration for human perception studies. The preliminary results indicate that under the present test conditions, the vertical vibration velocity of the human body is significantly higher than the horizontal velocity, with the vertical direction identified as the dominant vibration direction. The vertical vibration velocity exhibits a characteristic pattern of “attenuation below the waist and amplification above the waist”. Compared with the ground surface velocity, the attenuation rate in the lower body region ranges from 55.7% to 65.9%. The vibration velocity in the upper body region is amplified by a factor of 1.25 to 1.74. The horizontal vibration velocity decreases from the feet to the head, with an attenuation rate of 52.6% to 60%. The error in HRV indices obtained from the in-situ and shake-table tests is less than 10%, preliminarily confirming the feasibility of employing a shake table to simulate blasting vibration for human perception research. These exploratory in-situ tests provide a methodological reference for quantifying human vibration response and studying perceived ECG changes due to blasting vibrations.

Blasting excavation is a critical construction method for enhancing the canal channel expansion efficiency. However, the induced blasting vibration may adversely affect the substructure of existing waterway bridges. To clarify the dynamic response characteristics of the bridge substructure subjected to blasting-induced vibration, this study analyzed the stress and vibration velocity distributions in the adjacent bridge substructure during the Pinglu Canal channel expansion project. A finite element numerical simulation method, validated by field test, was employed to establish the safe vibration velocity threshold for the substructure based on the maximum tensile stress criterion. The results show that the maximum tensile stress occurs at the interface between the bridge pile foundation and the pile cap during canal blasting excavation. The most significant vibrations in the substructure are concentrated in the pile foundation. The allowable vibration velocity for the bridge substructure, with the pile cap as the monitoring point, is 3.2 cm/s.

In the blasting excavation project of the Pinglu Canal channel, the adjacent bridge pile foundation is in a repeated blasting vibration environment for a long time, and its structural damage accumulation effect directly affects the safety performance of the whole life cycle of the bridge. Clarifying the damage evolution mechanism of pile foundations under repeated blasting vibration is a key scientific premise for ensuring the coordinated development of efficient canal channel excavation and the safe operation of adjacent bridges. Based on the channel blasting project for the Luyang New Village Bridge in Pinglu Canal, combined with a finite element numerical model that considers the cumulative damage of the concrete structure, the influence of on-site blasting construction on the pile foundation during construction is simulated and analyzed. Based on the reliability analysis of the model, the cumulative damage variation law of pile foundation under different blasting times is simulated and analyzed. The damage variable prediction model based on the peak vibration velocity of pile foundation is established, and the cumulative blasting times of pile foundation safety under the given blasting center distance are obtained. The results show that the maximum damage variable value of the pile foundation appears on the horizontal side of the explosion source. When the explosion center distance is less than 20 m, the damage to the pile top area is significantly aggravated. The safe blasting times for pile foundations are 2~3 times longer when the blasting center distance is 20 m.