摘要
拟建的监利至华容长江公铁两用大桥在前期的论证选线阶段时,该区域的地质结构是桥位选址的重要依据之一,需查明各论证方案沿线的地质情况,因此,采用微动谱比法对长江两岸线路进行了初步勘探。首先,对研究区的地质情况进行概述,然后采用微动谱比法对论证方案线路周围进行地质勘查,并对结果进行解释与钻孔验证。结果表明,微动谱比法反演的速度剖面直观地显示了地下的地质构造特征,同时,与既有钻孔资料进行对比验证,证实了微动谱比法结果的可靠性,可以为初测阶段桥位选址提供指导,也兼顾了经济快速的要求,适合初测阶段的概查、普查工作。
The proposed Jianli-Huarong Yangtze River highway-rail bridge is an important cross-river passage connecting the north and south banks of the Yangtze River,Hunan and Hubei provinces,and it is a controlling project of the Jianghan Plain freight railway branch.In the early stage of demonstration and route selection,the geological structure of this area is one of the important basis for bridge site selection.According to the regional geological data and the results of geological surveys,the overburden layer in this area is relatively thick,the cost is high and the cycle is long with drilling method,so it is not suitable for large-scale implimentation.The microtremor horizontal-vertical spectral ratio method has been widely used in the field of engineering investigation in recent years.It has the characteristics of being fast and efficient,strong anti-interference ability,high resolution,and economical application.Therefore,in the initial measurement stage of the project,the microtremor horizontal-vertical spectral ratio method is used to identify the geological conditions around the demonstration route.The inverted velocity profile intuitively shows the geological structure characteristics of the underground,and at the same time,it is compared with the existing drilling data.The verification confirms the reliability of the results of the microtremor horizontal-vertical spectral ratio method,which can provide guidance for the site selection of the bridge in the initial test stage,and also takes into account the requirements of economy and speed,and is suitable for the general inspection work in the initial test stage.
作者
汪文刚
Wang Wengang(Geological Subgrade Design and Research Department,China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan Hubei 430063,China)
出处
《工程地球物理学报》
2021年第5期798-804,共7页
Chinese Journal of Engineering Geophysics
基金
国家重点研发计划项目(编号:2019YFC0605101)。
关键词
微动谱比法
大桥选址
谱比曲线
横波速度
速度反演
microtremor horizontal-vertical spectral ratio
bridge site selection
H/V curve
S-wave velocity
velocity inversion
