【摘要】 研究目的:在我国大陆地区第一座海底隧道——厦门翔安隧道的工程地质勘探中,通过研究地震反射波法的资料采集、处理和解释中的关键技术和难点,利用物探手段有效地解决海底隧道的工程地质问题,减少水上钻探的昂贵费用并缩短勘探工期。研究结论:在资料采集中,施测时间选择在海域平潮期间;在资料处理中,需把非规则多次覆盖观测系统转换成规则观测系统,通过加密速度分析点,提高资料处理质量;在资料解释中,归纳出时间剖面图中不同地质情况所对应的特征:淤泥较厚地段,海底界面反映为连续性好、频率高、能量低的反射波组;存在覆盖层时,显示为3个连续性较好的反射波组,无覆盖层时,显示为2个连续性较好的反射波组;存在裂隙或岩脉时,反射波组发生断开或上下位移。更多还原

【Abstract】 Research purposes:For the geological prospecting for Xiang’an Submarine Tunnel in Xiamen(the first submarine tunnel in mainland of china),the research is done on how to effectively solve the engineering geological problems with geophysical prospecting method,such as how to collect,process and interpret the data when using the seismic reflection prospecting for submarine tunnel,for the purpose of reducing the expense of prospecting and shortening the prospecting period.Research conclusions:The data collection must be conducted during sea slack tide.The non-regulation observation system of reflection seismic exploration must be transferred to regulation observation system,and quality of data processing can be improved by density of the velocity analysis points.In the data interpretation,the characteristics corresponding to the different geological conditions in the time reflection profiles are summed up.Namely,the reflection line-ups of nicer continuity,higher frequency and lower amplitude correspond to the seabed with thicker silt,the indication of three continuous reflection line-ups correspond to the stratum covered by soil,indication of two continuous reflection line-ups correspond to the stratum with no cover of soil,and when the reflection line-ups occurrs twist or disconnection,it corresponds to the cranny or the rock-vein.更多还原