水域地震反射波法在陆丰核电厂排水隧洞勘察中的应用

Application of water area seismic reflection method in investigation of Lufeng nuclear power plant drainage tunnel

水域工程的地球物理探测方法首选地震反射波法,其具有高效、定位准确等特点。陆丰核电厂1、2号机组的排水隧洞工程盾构法施工区间长度超过2km,勘察资料显示盾构区间存在孤石、基岩凸起、基岩破碎带等不良地质,准确查明盾构区间内不良地质的分布情况可为盾构施工提供重要依据。本文采用地震反射波法对盾构区间进行全面探测,基本查明了区间内基岩界面、基岩凸起分布区段,发现3处基岩破碎带,圈定疑似孤石异常若干处,根据探测成果提出验证钻孔14处;经第三方钻孔验证,探测成果准确查明了基岩界面,并成功揭示了孤石、破碎带等不良地质。

Seismic reflection method is the preferred method in the engineering in waters,which has the characteristics of high efficiency and accurate positioning. Shield tunneling more than 2km will be carried out in the water discharge tunnel of Lufeng nuclear power plant unit 1 and 2. The investigation shows that many adverse geological events,such as corestone,bedrock bulges and fracture zones will be encountered.It is important to make it clear before shield construction. The bedrock interface,bedrock bulge,three bedrock fracture zones and some boulder abnormal in the shield construction area are located by seismic reflection method. 14 nos. of drillholes are proposed to verify. The drilling results show that the seismic reflection method is to locate the bedrock interface,corestone,and fracture zone is successful.