金塘海底隧道工程地质综合勘察技术研究  

Study on Engineering Geological Comprehensive Survey Technology of Jintang Subsea Tunnel

作　　者：王亚飞[1] WANG Yafei(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道标准设计》2023年第12期30-37,共8页Railway Standard Design

基　　金：中铁第四勘察设计院集团有限公司科研课题(2019K024)。

摘　　要：甬舟铁路金塘海底隧道水下地形及海况复杂,具有高水压、长距离穿越软硬不均土岩复合地层和深厚第四系松软地层等地质特点,其工程建设标准高、规模大、工程风险高,对勘察精度要求高。为实现土岩复合地层的精细化勘察、准确获取海底地层参数和提高测试试验精度等目的,采用海上测绘、物探、机动钻探、静力触探及岩土测试与试验等综合勘察手段,详细查明了隧址区工程地质与水文地质特征,对海底盾构隧道的综合勘察技术进行探索研究。研究结果表明,基于短基线定位系统的侧扫声呐技术可显著提高海底地形测量精度;多道三维地震反射物探技术可实现复杂海域软硬不均土岩复合地层、基岩弱风化面起伏大及构造发育等复杂工程地质的精细化勘察,其丰富的三维物探数据可实现高效、高精度三维地质表达,为综合地质分析与勘探优化布置提供依据;利用自升式海上勘探作业平台,验证了静力触探技术对海域第四系地层勘探的适应性和参数获取的可靠性;宜根据海域环境、勘探测试需求等,优势互补选取海上勘探作业平台。Jintang Subsea Tunnel of Ningbo-Zhoushan Railway has complex seabed topography and marine environment.Its geological characteristics are high water pressure,long-distance crossing through uneven hardness soil-rock composite strata and deep Quaternary loose strata etc.Its high level construction standard,large scale and high risk make the survey precision higher.In order to finely survey of the soil-rock composite strata,accurately obtain the parameters of the seabed strata and improve the accuracy of the test,the comprehensive survey measures such as sea surveying and mapping,geophysical prospecting,drilling,static penetration test and geotechnical test are adopted.The engineering geology and hydrogeology of the tunnel are identified in detail.The comprehensive survey technology of the subsea shield tunnel is studied.The result shows:Side scan sonar based on short base line positioning system technology can significantly improve the accuracy of seabed topographic mapping.The multi-channel 3D seismic reflection geophysical prospecting technology can realize the fine exploration of complex engineering geology such as uneven hardness soil-rock composite strata,sharply fluctuating bedrock surface and geological structure.Its rich 3D geophysical data can be used for efficient and high-precision 3D geological modeling.It is meaningful for comprehensive geological analysis and optimizing the laying out of the prospecting project.By using the jack up platform,the static penetration test is adaptable to Quaternary strata undersea,and the reliability of formation parameters acquisition are verified.It is suggested to select rig platform based on its advantages,the marine environment,survey and testing requirements etc.

关 键 词：高速铁路 铁路隧道 海底隧道 综合勘察 复合地层 三维地震反射物探 

分 类 号：U238[交通运输工程—道路与铁道工程] U459.1[建筑科学—桥梁与隧道工程] P736.12[天文地球—海洋地质]