复杂岩溶地层地铁车站深基坑涌水灾害的声呐探测及综合治理
邱运军1,2郑爽3,4魏东3,4冯诗洋1王祥秋5
Sonar Detection and Comprehensive Treatment of Water Inrush Disaster for Metro Station Deep Foundation Pit in Complex Karst Strata
QIU Yunjun1,2ZHENG Shuang3,4WEI Dong3,4FENG Shiyang1WANG Xiangqiu5
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作者信息:1.中国建设基础设施有限公司，100044，北京
2.中建南方投资有限公司，518101，深圳
3.中国建筑第四工程局有限公司，510610，广州
4.中建四局土木工程有限公司，518101，深圳
5.佛山科学技术学院，528225，佛山
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Affiliation:1.China Construction Infrastructure Co., Ltd.，100044， Beijing, China
2.China Construction Southern Investment Co., Ltd.， 518101， Shenzhen， China
3.China Construction Fourth Engineering Division Co., Ltd.， 510610， Guangzhou， China
4.CSCEC4 Civil Engineering Co., Ltd.， 518101， Shenzhen， China
5.Foshan University， 528225， Foshan， China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.06.021
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中图分类号/CLCN:TU94+3∶U231.3
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栏目/Col:研究报告
摘要:
［目的］在佛山地区，复杂岩溶地层具有特殊性，其钙质粉砂岩地层及其破碎带极易引发地铁车站基坑涌水灾害。因而有必要采用声呐技术进行探测，并通过综合治理解决涌水问题。［方法］以佛山地铁3号线中山公园站为研究对象，从涌水险情出发，介绍了该站声呐探测方案，并基于探测结果分析了该站深基坑地下水的渗漏特性，判定了渗漏点的空间分布及其涌水灾害类型。结合基坑底部超前钻勘察成果及基坑内涌点分布特征，提出了坑外后退式双液注浆止水帷幕+坑内咬合旋喷桩基坑渗漏联合封堵方案。着重阐述了方案中后退式双液注浆、双管旋喷咬合桩以及MJS（全方位高压喷射）桩等技术的施工要点。对采用综合治理前后的代表性测孔处地下水渗流速度进行对比，以验证治理效果。［结果及结论］声呐探测技术能精准探查岩溶地层深基坑渗漏点的具体位置及其渗流场相关参量。采用后退式双液注浆、双管旋喷咬合桩及MJS桩相结合的联合封堵方案可有效解决复杂岩溶地段深基坑开挖大面积涌水渗漏技术难题。
Abstracts:
［Objective］ In Foshan Area, due to the specific characteristics of the complex karst stratum, the calcareous siltstone stratum and the fracture zone can easily cause water inrush disaster in metro station foundation pit. Therefore, it is necessary to adopt sonar technology for detection and solve the water inrush problem through comprehensive treatment. ［Method］ Taking Zhongshan Park Station of Foshan Metro Line 3 as the research object, the sonar detection scheme for the station is introduced, the groundwater leakage characteristics of the station deep foundation pit are analyzed based on the detection results, the spatial distribution of leakage points and the type of the water inrush disaster are determined. Based on the results of advanced drilling exploration at the bottom of the foundation pit, and the distribution characteristics of the water inrush points in the foundation pit, a joint sealing scheme for leakage in the foundation pit is proposed, including a retreating double liquid grouting waterproofing curtain outside the pit and a pit interlocking rotary jet grouting pile.The key construction techniques of the retreating double liquid grouting, interlocking rotary jet grouting pile and MJS (metro jet system) pile are emphatically described.The groundwater leakage speeds at representative test holes before and after comprehensive treatment are compared to verify the treatment effect.［Result & Conclusion］The sonar detection technology can accurately detect the specific spots of the deep foundation pit water leakage points in karst stratum and the relevant parameters of the seepage field. The adopted joint sealing scheme of double liquid grouting, double pipe rotary jet interlocking pile and MJS pile can effectively solve the technical problem of large-scale water inrush and leakage in deep foundation pit excavation in complex karst area.
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