摘要
沱江水下盾构隧道于沱江大桥与滨江大桥之间穿越沱江,该隧道工程系区间重难点项目,工程建设标准高,需要对沱江的水下地形及地质条件进行高精度全面勘察,本研究旨在为江上地质勘察提供实际案例,并为该隧道工程的施工提出合理建议。针对沱江水下盾构隧道的特点,先后采用多波束声呐勘测、水上高密度电法、水域瞬变电磁法3种物探方法,通过多波束声呐勘测,可获取准确的水下河床地形等信息;通过水上高密度电法与水域瞬变电磁法,可揭示江水下地层分布情况及物探异常区域,并对水上钻探的布置提供指导;钻孔取芯结果可提供关于隧道洞身围岩的准确信息,并验证综合物探方法揭示的电性异常区域。研究结果表明,3种物探方法的综合运用能准确定位地质异常区域,通过多种物探方法的综合对比和相互佐证能提高地质信息解译的可靠程度;综合物探方法和钻孔相互验证,能为水下盾构隧道的设计施工提出合理建议。
The underwater shield tunnel of the Tuojiang River,which spans between the Tuojiang Bridge and the Binjiang Bridge,represents a crucial and challenging engineering project in this section,and characterized by exacting construction standards.The successful execution of the project requires a meticulous and highprecision survey of the underwater topography and geological conditions of the Tuojiang River.The aim of the study is to present practical cases for conducting geological surveys in river environments and provide wellfounded recommendations for the construction of underwater shield tunnels.To investigate the underwater shield tunnel in the Tuojiang River,three geophysical methods were utilized:multi-beam sonar survey,highdensity electrical method conducted above water,and transient electromagnetic method implemented in water.The multi-beam sonar survey facilitated the acquisition of precise data concerning the topography of the underwater riverbed.The electrical profiles obtained through the high-density electrical method above water and the transient electromagnetic method in water provided initial insights into the distribution of underwater strata and potential areas of abnormality.These findings guided the arrangement of water drilling.Furthermore,the results obtained from core drilling furnished accurate information regarding the surrounding rock formations of the tunnel structure and corroborated the electrical anomalies identified through the comprehensive geophysical method.The findings of this study demonstrated that the comprehensive utilization of the aforementioned geophysical methods enable the accurate identification of geological anomaly areas.By employing a comprehensive comparison and mutual reinforcement of diverse geophysical techniques,the reliability of interpreting geological information can be enhanced.Drawing upon the comprehensive geophysical methods and the validation obtained through drilling,rational recommendations can be proposed for the design and construction of underwater shield tunnels.
作者
覃钧戈
边兆鑫
柴春阳
QIN Junge;BIAN Zaoxin;CAI Cunyang(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《铁道勘察》
2024年第3期77-82,共6页
Railway Investigation and Surveying
基金
中铁二院地勘岩土工程设计研究院科技开发计划课题(KDNQ214138)。
关键词
地铁
工程物探
水下盾构隧道
多波束声呐
水上高密度电法
水域瞬变电磁法
metro
engineering geophysical exploration
underwater shield tunnel
multi beam sonar
high density electrical method above water
transient electromagnetic method implemented in water
