首页|城市轨道交通隧道综合岩溶勘察技术创新应用

城市轨道交通隧道综合岩溶勘察技术创新应用

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为控制岩溶发育地区城市轨道交通工程施工过程中的地质风险,准确查明隧道洞身区域岩溶发育程度及特点至关重要.若仅采用在隧道结构线外侧实施钻探的方法,存在隧道范围内岩溶无法准确查明等不足.针对此问题,以贵阳市城市轨道交通3 号线一期工程区间隧道为例,针对不同平面位置、深度岩溶的发育特点,在调查获取相关勘察资料基础上,采用地质雷达、微动、高精度瞬变电磁等地面物探方法,逐步圈定岩溶发育的重点区域,再通过在隧道中线位置实施钻探进行验证,并对溶洞充填物进行原位测试及室内试验,最后利用钻孔开展跨孔CT和管波测试.物探推断 197 处岩溶发育,有34 处与钻孔揭露溶洞相吻合,70%的洞径小于 2 m;94%溶洞分布于底板埋深以上,其中 29%分布于隧道洞身范围内;55%以上钻孔揭露溶洞为无充填类型.本次岩溶勘察查明了岩溶类型及形态、岩溶空间分布特征、岩溶与隧道结构关系、溶洞充填情况等信息,为该项目设计施工提供翔实、准确的地质资料.
Innovative Application of Comprehensive Karst Survey Technology in Urban Rail Transit Tunnel
It is crucial to accurately determine the degree and characteristics of karst development in the tunnel body area in order to control the geological risks during the construction process of urban rail transit projects in karst developed areas.If drilling is carried out outside the tunnel structure line,there are shortcomings such as the inability to accurately identify karst within the tunnel area.In response to this issue,taking the section tunnel of the Phase I project of Guiyang Urban Rail Transit Line 3 as an example,based on the development characteristics of karst at different plane positions and depths,engineering geological surveys were conducted to obtain relevant survey data.Ground geophysical methods such as ground penetrating radar,micro motion,and high-precision transient electromagnetic were used to gradually delineate the key areas of karst development,and then verified by drilling at the centerline position of the tunnel,in-situ testing and indoor testing were conducted on the filling material of the karst cave,and finally cross hole CT and tube wave testing using drilling was conducted.The survey results indicate that 197 karst areas are developed,of which 34 are consistent with the karst caves exposed by drilling,and 70%of the cave diameters are less than 2 meters,and 94%of the karst caves are distributed above the depth of the bottom plate of which 29%are distributed within the range of the tunnel body.More than 55%of the boreholes exposed karst caves are of unfilled type.This karst survey has identified the types and forms of karst,the spatial distribution characteristics of karst,the relationship between karst and tunnel structure,and the filling situation of karst caves,providing detailed and accurate geological data for the design and construction of the project.

urban rail transitkarst surveytunnel centerline drillingtransient electromagneticcrosshole CTinchingtube wave

孙中科

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中铁第六勘察设计院集团有限公司,天津 300308

城市轨道交通 岩溶勘察 隧道中线钻探 瞬变电磁 跨孔CT 微动 管波

中国中铁股份有限公司科技开发重点项目中国中铁股份有限公司科技开发重点项目中铁第六勘察设计集团有限公司科技开发重点项目

2017-重点-242017-重点-25KY-2021-05

2024

10.19630/j.cnki.tdkc.202308010002

铁道勘察
中铁工程设计咨询集团有限公司

铁道勘察

影响因子：0.542
ISSN：1672-7479
年,卷(期)：2024.50(2)
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