物探法在大连湾海底隧道地质勘察中的应用研究  

Application of geophysical exploration in geological survey of Dalian Bay Subsea Tunnel

作　　者：刘宇 徐凤雷 朱峻言 LIU Yu;XU Feng-lei;ZHU Jun-yan(No.3 Engineering Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Dalian,Liaoning 116083,China;CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300461,China;Enterprise Key Laboratory of Underwater Tunnel Construction Operation and Maintenance Technology of Tianjin,Tianjin 300461,China)

机构地区：[1]中交一航局第三工程有限公司,辽宁大连116083 [2]中交第一航务工程局有限公司,天津300461 [3]天津市水下隧道建设及运维技术企业重点实验室,天津300461

出　　处：《中国港湾建设》2022年第12期7-12,共6页China Harbour Engineering

摘　　要：海底地质勘探是保证水下工程质量和安全性的首要环节,适当的物探手段是海域地勘的关键。依托大连湾海底隧道建设工程,针对沉管基槽底部可能存在溶洞,危害施工安全的问题,采用以单道地震勘探法和瞬变电磁法对施工线段进行整体物探,再结合钻探对局部进行验证的方法,在确定溶洞的位置、规模及深度的同时,对海底地质勘探方法进行探索,为水下工程施工提供参考。勘探结果表明:1)勘探区域共存在49处物探异常,主要为白云岩溶蚀裂隙密集区或岩溶发育的反映,不存在大规模溶洞,不构成施工安全威胁;2)综合物探和钻探的方法能够有效提高勘探结果的可靠性和科学性,在设计和勘察阶段为水下工程提供准确依据和有力支撑。Subsea geological exploration is the primary link to ensure the quality and safety of underwater engineering,and appropriate geophysical exploration means are the key to marine geological exploration.Based on the construction project of Dalian Bay Subsea Tunnel,in view of the possible karst caves below the foundation trench for the immersed tubes,which may endanger the construction safety,the single-channel seismic exploration method and the transient electromagnetic method were first used to carry out overall geophysical exploration for the planned alignment of the project and then boreholing was made to verify the results in selected localities.While determining the location,scale and depth of the karst caves,the seabed geological exploration method was explored to provide a reference for underwater engineering and construction.The results of geophisical exploration show that:1)there are 49 anomalies in the exploration area,mainly reflections of dolomite dissolution fissures or karst development,but no large karst caves,which do not pose a threat to construction safety;2)the integrated physical and boreholing exploration method can effectively improve the reliability and scientificity of the exploration results,and provide an accurate basis and strong support for underwater engineering in the design and exploration stage.

关 键 词：海域工程勘察 单道地震勘探 瞬变电磁法 海底地貌 

分 类 号：U652.2[交通运输工程—港口、海岸及近海工程] TU43[交通运输工程—船舶与海洋工程]