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在场地狭窄,电性干扰严重的浅覆盖岩溶区,不利于电探方法来探查地下地层的岩溶发育特征。推荐采用地震纵波速度成像、横波速度剖面来综合探查地下的基岩起伏、地质结构和岩溶发育特征。在野外采用同一个排列保持道距不变的情况下,很容易获得这两种方法的地震记录。两种方法研究结果表明,多道噪音记录的折射微动面波法在探测基岩起伏方面具有较高的分辨率但探测深度浅;多炮点纵波速度成像对基岩面有平滑作用但探测深度较深。钻探资料证实,纵波速度成像中的相对低速区反映基岩内岩溶裂隙发育,是寻找地下水的有利靶区。多道记录,炮点—检波点射线高密度覆盖,可保证获得可靠的速度资料。两种方法联合探测地下岩溶特征具有一定的优势。
In shallow covered karst areas with narrow electric fields and serious electrical interference, it is not conducive to the electric exploration method to explore the karst development characteristics of underground formations. Recommended seismic longitudinal wave velocity imaging, shear velocity profiles to comprehensively explore underground bedrock fluctuations, geological structure and karst development characteristics. Seismic records of these two methods are readily available in the field using the same arrangement to maintain the same track spacing. The results of the two methods show that the multi-channel noise refraction surface-moving wave method has higher resolution in detecting bedrock fluctuations but shallow exploration depth; multi-shot P-wave velocity imaging has a smoothing effect on the bedrock surface but the detection Deep depth. The drilling data confirm that the relatively low velocity region in P-wave velocity imaging reflects the development of karst fissures in the bedrock and is a favorable target area for seeking groundwater. Multi-channel recording, shots - Detector spot high-density ray coverage, to ensure access to reliable speed data. The combination of the two methods to detect underground karst features has certain advantages.