Vibrating table test of human comfort under blasting vibration and its evaluation system construction
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摘要: 針對現有爆破振動影響下人體舒適度評價體系中人體主觀感受的不確定性,通過振動臺模擬爆破振動開展人體振動反應試驗,結合人體心電指標,分析爆破振動參數、心電指標以及人體主觀感受的量化關系,構建爆破振動影響下人體舒適度評價體系。研究結果表明:豎直方向是影響人體舒適度的主要振動方向,且振動對人體的影響與人體主要震感部位有關,主要震感部位從腳部到頭部上移時,影響也逐漸增大;隨著振動頻率和速度的增加,人體心電指標相鄰RR間期之差的均方根(RMSSD)在豎直方向振動下呈現出先減小后增大的趨勢,在水平方向振動下則一直減小,但減小的幅度有限;RMSSD的下降比例與爆破振動參數以及人體主觀感受之間存在定量關系,利用三者之間的定量對應關系可實現爆破振動影響下的人體舒適度定量評價;爆破施工時,可將0.7 cm·s?1的地表豎直方向振動速度和80 Hz的振動頻率作為鄰近人群密集區域爆破工程的控制閾值。Abstract: Blasting is widely used in national infrastructure construction as a paramount means of excavating hard rock and soil bodies. Blasting operations frequently occur in densely populated areas, endangering human physical and mental health. To reasonably evaluate the impact of blasting disturbance on personnel in adjacent areas and ensure the safety of the physical and mental health of personnel, constructing a human comfort evaluation system under the influence of blasting vibration is essential. Because of the uncertainty of human subjective feelings in the existing human comfort evaluation system under the influence of blasting vibration, the human vibration response test was performed by simulating blasting vibration using a vibrating table. Subjective sensations and electrocardiogram (ECG) changes were collected from 16 volunteers under the influence of blast vibration in different directions and at different levels. Subjective human sensations were quantified using the root mean square of successive differences (RMSSD) of adjacent RR interval values, a time-domain indicator of heart rate variability. The quantitative relationships among blasting vibration parameters, ECG index, and human subjective feelings were analyzed. A human comfort evaluation system under the influence of blasting vibration was constructed. The results show that the vertical direction is the main vibration direction affecting human comfort, and the influence of vibration on the human body is related to the main vibration-sensitive parts of the human body. When the main vibration-sensitive parts move up from the foot to the head, the influence is gradually increased. There is a link between the ST segment in the human ECG and human comfort. When the human body is subjected to vertical vibration, there is a drop in the ST segment in human ECG and human comfort is reduced, whereas there is no significant change under horizontal vibration. With an increase in vibration frequency and velocity, the human ECG index RMSSD shows a trend of first decreasing and then increasing under the vertical vibration; meanwhile, it decreased under the horizontal vibration, but the decreasing amplitude is limited. There is a quantitative relationship between the decline ratio of RMSSD and blasting vibration parameters and human subjective feelings. The quantitative relationships among blasting vibration parameters, ECG index, and human subjective feelings can realize the quantitative evaluation of human comfort under the influence of blasting vibration. In the blasting construction, a vibration velocity of 0.7 cm·s?1 and a vibration frequency of 80 Hz in the vertical direction of the surface can be used as the control threshold of blasting engineering in the adjacent densely populated area.
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Key words:
- blasting vibration /
- vibrating table test /
- ECG indicators /
- human comfort /
- quantitative evaluation.
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表 1 人群密集區域地表爆破振動水平的調查結果
Table 1. Survey results of surface blasting vibration level in densely populated areas
Vibration parameters Surface vibration levels in
densely populated areasVibration velocity /(cm·s?1) >0.08 Vibration frequency /Hz 1–120 表 2 試驗工況
Table 2. Test conditions
Vibration direction Test conditions Vibration velocity/(cm·s?1) Vibration frequency/Hz Vertical direction (z) 1 0.05 2 2 0.10 4 3 0.50 8 4 0.70 20 5 1.00 60 6 2.50 80 7 3.50 100 8 4.50 120 Horizontal
direction (y)9 0.05 2 10 0.10 4 11 0.50 8 12 0.70 20 13 1.00 60 14 2.50 80 15 3.50 100 16 4.50 120 表 3 試驗人員身體參數
Table 3. Body parameters of test personnel
Number Gender Height/cm Weight/kg BMI/(g·cm?2) 1 Male 170 80 2.77 2 Male 171 62 2.12 3 Male 172 92 3.11 4 Male 175 65 2.12 5 Male 166 65 2.36 6 Male 178 62 1.96 7 Male 178 70 2.21 8 Male 165 53 1.95 9 Female 162 58 2.21 10 Male 169 71 2.49 11 Male 165 70 2.57 12 Female 163 46 1.73 13 Male 178 72 2.27 14 Male 175 78 2.55 15 Male 170 55 1.90 16 Male 170 65 2.25 表 4 試驗人員主觀感受
Table 4. Subjective feelings of test personnel
N The main vibration sensation parts and subjective feelings Test conditions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 BF F L W; CD C; DC H; DY L; NS F; NS F F F L L L L L 2 BF L W; NT W; NT C; CD H; DY; NT L; NS F; NS F F F L L L L L 3 BF F F L C; DC H; DY L; DY F; CD F F F L L L L L 4 F L W C; DC S; DY H; NT; BV S; DY F; NS F F F L L L L; PC L; PC 5 F L W; CD W; DC S; NS H; NT; BV S; NS L; NS F F F L L L L L; NS 6 F L; NS W; NS C; CD C; DC H; DY F; DC F; NS F F F L L L L L 7 BF L L W C; CD H; DY L; CD F; NS F F F L L L L L 8 F L; CD W; NS W; PC S; DY H; DY; BV C; DY L; CD F F F L L L L L 9 F L; CD W; NS W; PC H; DY H; DY; BV S; DY L; CD F F F L L L L; NS L; NS 10 F L C; DC S; NS H; DY H; NT; BV H; DY F; PC F F F L L L L L 11 F W S H; BV H; DY H; NT; NS S; DY C; NS F F F L L L L; NS L; PC 12 F L W; CD S; NS C; DC H; DY L; NS F; NS F F F L L L L L 13 BF L W S H; NS H; NS L; CD F; NS F F F L L L L L 14 F L S H; NS H; DY H; DY; BV L; NS F; NS F F F L L L L L; NS 15 F F L W C; DC H; DY; TS L; TS F; NS F F F L L L L L 16 BF F L C S H; NS L; CD F; NS F F F L L L L L 表 5 試驗人員各工況下相比靜息狀態RMSSD的平均下降比例
Table 5. Average decreased ratio of RMSSD under different testing conditions compared with that under resting state
Test conditions Vibration velocity/(cm·s?1) Vibration frequency/Hz Average drop ratio of RMSSD/% 1 0.05 2 6 2 0.10 4 15 3 0.50 8 17 4 0.70 20 28 5 1.00 60 34 6 2.50 80 43 7 3.50 100 38 8 4.50 120 30 9 0.05 2 2 10 0.10 4 5 11 0.50 8 7 12 0.70 20 10 13 1.00 60 12 14 2.50 80 15 15 3.50 100 17 16 4.50 120 21 表 6 RMSSD下降比例與人體舒適度的關系
Table 6. Relationship between RMSSD decline ratio and human comfort
Degree of annoyance Average drop ratio of RMSSD Not annoyed <0.17 Slightly annoyed 0.17–0.28 General annoyed 0.28–0.34 Highly annoyed >0.34 表 7 地表振動水平與人體舒適度的關系
Table 7. Relationship between the surface vibration level and human comfort
Vibration directions Vibration frequency/Hz Vibration velocity/(cm·s?1) Degree of annoyance Vertical direction ≤80 <0.50 Not annoyed 0.50–0.70 Slightly annoyed 0.70–1.00 General annoyed 1.00–2.50 Highly annoyed 100 2.50–3.50 Highly annoyed 120 3.50–4.50 Slightly annoyed Horizontal direction ≤80 <2.50 Not annoyed 100 2.50–3.50 Not annoyed 120 3.50–4.50 Slightly annoyed www.77susu.com -
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