高频破碎锤水下破礁特性的现场试验研究

Field test of underwater reef breaking characteristics of high frequency hydraulic breaking hammer

为研究长江航道环境敏感区生态清礁技术,通过开展高频破碎锤水下清礁现场试验,研究高频破碎锤水下清礁特性,优化破礁参数。试验结果表明:高频破碎锤锤击过程中钎杆嵌入礁石的速度随钎杆和礁石接触面的增大而逐渐降低。钎杆嵌入深度随锤击时间的增大依次经历陡增、缓增及恒定3个阶段,依次对应高频破碎锤的高效破岩、低效破岩和无效破岩阶段。高频破碎锤水下清礁的单次最优锤击时间为20 s,最优锤击间距为0.3 m。研究成果对丰富环境敏感区水下生态清礁技术具有重要的参考价值。

To study the ecological reef clearing technology in the environmentally sensitive area of the Yangtze River channel,the field test of underwater reef clearing with high frequency hydraulic breaking hammer is carried out to study the underwater reef clearing characteristics of high frequency hydraulic breaking hammer and optimize the reef breaking parameters.The test results show that the speed of the drilling rod embedded in the reef gradually decreases with the increase of the contact surface between the drilling rod and the reef.With the increase of strike time,the embedment depth of the drilling rod experiences three stages in turn:steep increase,slow increase and constant,corresponding to the high efficiency rock breaking,low efficiency rock breaking and ineffective rock breaking stages of the high frequency hydraulic breaking hammer in turn.The single optimal strike time of high frequency hydraulic breaking hammer is 20 seconds and the optimal strike distance is 0.3 meters.The research results have important reference value for enriching underwater ecological reef clearing technology in environmentally sensitive areas.