Science Technology and Engineering
1671-1815
2024
24
20
8673
8680
10.12404/j.issn.1671-1815.2304500
article
水下凿岩冲击对邻近堤岸影响的现场试验
Impacts of Underwater Drilling on Adjacent Embankment by Field Test
水下凿岩棒法是一种简便高效的破岩清礁技术，然而凿岩冲击强大能量的瞬间释放引起的岩土层振动将波及邻近建（构）筑物，进而削弱其正常服役能力。依托广州LNG应急调峰气源站配套码头工程取水口凿岩清礁项目，通过现场实测，探索水下凿岩冲击作用下堤岸振动响应规律。试验结果表明：水下凿岩冲击作用下堤岸振速响应很快达到峰值后逐渐衰减，单次凿岩堤岸振动持续时间约0.2s~0.5s，距离凿岩点越近，振动响应越及时，响应衰减得也越快；堤岸振速峰值随凿岩点距增大而衰减，其中竖向衰减最显著，垂直堤岸方向衰减较弱，此外堤岸呈现出整体向垂直堤岸方向运动趋势；堤岸峰值振速随落锤高度增大而增大，但当落锤高度增大至一定时，继续增大落锤高度，堤岸振动响应增大并不明显。参考水下爆破安全距离计算方法，通过求解凿岩锤水下运动方程，给出了水下凿岩临近结构振动速度峰值实用计算方法。
Underwater rock drilling rod method is a simple and efficient technique for rock breaking and reef clearing. However, the vibration of rock and soil layer caused by the instantaneous release of powerful energy of drilling impact will spread to adjacent structures, thus weakening their normal service ability. Based on the reef clearing project of Guangzhou LNG emergency peak shaving gas station supporting wharf engineering, the vibration response of embankment induced by underwater drilling is explored through field test. The test results show that during the underwater drilling progress, the vibration velocity response of the embankment quickly reaches the peak and then gradually decays. The embankment vibrates continuously about 0.2 ~ 0.5s during the implementation of one single underwater drilling. The closer to the drilling point, the more timely the vibration response is, and the faster the response decays. The peak e vibration velocity of the embankment decreases with the increase of the distance between the embankment and drilling point. The vertical vibration attenuation is the most significant, and the vibration attenuation in the perpendicular direction of the embankment is weak. As a result, the embankment tends to move towards its perpendicular direction. The peak vibration velocity of the embankment increases with the increase of the drop hammer height, however, the vibration response of the embankment increases inconspicuously until the drop hammer distance increases to a certain height. Referring to the calculation formula of underwater blasting safety distance of adjacent structures, one practical calculation method of vibration velocity peak value due to the underwater drilling operation is presented by solving the underwater motion equation of the drilling hammer.
水下凿岩; 堤岸动力响应; 现场试验; 振动传播规律；实用计算方法
underwater drilling; embankment dynamic response; field test; vibration propagation law
欧振锋,魏立新,杨春山,刘东东
Ou Zhenfeng, Wei Lixin, Yang Chunsan, Liu Dongdong
jsygc/article/abstract/2304500