摘要
广州地区地质复杂多变,被称为“地质博物馆”,其中灰岩地层溶洞发育强烈,在地铁围护结构设计、施工阶段大多采用钻探手段分析地质情况,由于大多地铁车站往往布置在道路中心,勘察阶段钻孔施工存在围蔽次数多、地下管线繁杂、交通流量大的问题,造成勘察成本高、效率低。施工阶段详勘和补勘揭露的溶洞往往不全面,存在围护结构施工期间遇到溶洞时难以成槽,基坑开挖期间基坑涌水的风险,最终影响安全、质量、成本不可控。本文结合广花城际花城街站工程实例,通过选取试验段,采用钻孔数据验证物探数据准确度。选择质量高、经济合理的物探方式,对溶洞探测做到有的放矢,减少后续因岩溶揭露不全面,处理不到位造成施工、运营阶段的风险。
The geology of Guangzhou is complex and changeable,known as the"geological museum",in which the karst caves in limestone strata are strongly developed.In the design and construction stages of the subway enclosure structure,most of the geological conditions are analyzed by means of drilling.Because most subway stations are often arranged in the center of the road,the drilling construction in the survey stage has many problems such as the number of enclosures,the complexity of underground pipelines,and the large traffic flow,resulting in high survey costs and low efficiency.The karst caves revealed in the detailed and supplementary survey during the construction stage are often not comprehensive.There is a risk that it is difficult to form a trench when encountering karst caves during the construction of the retaining structure.The risk of water gushing from the foundation pit during the excavation of the foundation pit will ultimately affect the safety,quality and cost uncontrollable.In this paper,the accuracy of geophysical data is verified by selecting the test section and using borehole data in combination with the engineering example of Huacheng Street Station in Guanghua Intercity.Select high quality,economic and reasonable geophysical prospecting methods,make targeted exploration of karst caves,and reduce the risks in the construction and operation stages caused by incomplete karst exposure and inadequate treatment.
作者
任艳超
Ren Yanchao(China Railway 21st Bureau Group Rail Transit Engineering Co.,Ltd.,Jinan,China)
出处
《科学技术创新》
2023年第7期175-179,共5页
Scientific and Technological Innovation
关键词
灰岩地层
发育强烈
物探数据
基坑涌水
试验段
地铁车站
limestone stratum
strong development
geophysical data
water gushing from foundation pit
test section
subway station
