摘要
某拟建长江大桥需要采用物探方法查明桥址区范围内各岩土层的分布厚度及断裂破碎带构造发育状况。由于物探测量是在水面并且是在横穿水流的条件下作业,因此选择合适的物探方法及合适的观测系统参数是获得高质量的原始数据、完成勘查目标的必要条件。在工程实践过程中分析了地质地球物理条件、勘探目标及水上施工环境,选用了地震映像法和瞬变电磁法两种物探方法,并根据物探理论和现场试验选择了合适的装置类型,计算了采集技术参数,取得了良好的勘察效果。
The geophysical prospecting method for a proposed Yangtze River bridge is nee- ded to detect distribution thickness of rock and soil layers and the structural development status of fracture. Because of over-water and crossing-over-water geophysical survey, the selection of suitable geophysical method and observation system parameters is an essential prerequisite for obtaining high quality raw data and completion of exploration targets. In the course of engineering practice, based on the analysis of the geological and geophysical conditions, exploration target, over-water construction environment, the author chose seis- mic imaging method and transient electromagnetic method（TEM）. Meanwhile, the suitable geophysical method and device type has been selected according to the theory of geophysical prospecting and field test, and the collected technical parameters are processed, which ob- tained good prospecting effect.
出处
《工程地球物理学报》
2016年第4期546-552,共7页
Chinese Journal of Engineering Geophysics
关键词
地震映像法
分辨率
时窗
瞬变电磁法
线圈
seismic imaging method
resolution
time window
transient electromagnetic method
coil
