合肥地铁隧道地层组合分类及暗挖适用性研究
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摘要
地铁隧道的施工与所穿越的地层条件联系紧密。通过对现有的合肥轨道交通1～5号线地质勘探资料和工程资料的整理总结,结合合肥地区地形地貌特征,采用统计分析、数值模拟和现场实测的方法,对合肥地区的暗挖工程地质条件进行较深入地研究。研究结果表明:对合肥地区工程地质层组进行总体概化可以遵循"以地层的沉积年代为主,以岩土的工程适用特征为辅"的划分原则;按照地层断面特征将合肥地铁隧道可能穿越的地层组合归纳为A～D 4种类型,其中A类地层组合对隧道施工最为有利,B类地层组合对围岩变形的控制能力优于C,D类地层组合。以上结果可为合肥地铁沿线地质条件分析及暗挖隧道施工提供指导性的建议。
The construction of metro tunnel is closely related to the geological conditions. Through summarizing the geological exploration data and the engineering data of the planned Hefei metro line 1～5, the distribution of geomorphic feature in Hefei area was also taken into consideration to study the geological conditions of shallow tunneling engineering of Hefei metro in depth. Three different methods including statistical analysis, numerical model and field measurement had been adopted to make the research more comprehensive and rigorous. The results indicate that the overall generalization of the engineering geological layer, namely, unifying and simplifying the serial number of strata by engineering geology, can be followed by the principle that "the sedimentary age of stratum is given to the priority with the application of geotechnical engineering as the complement" in Hefei area. According to the characteristics of stratigraphic section, the stratum combinations which Hefei metro tunnel might cross can be classified as A～D, among them A stratum combination is the most favorable for the tunnel construction, B stratum combination's ability to control the deformation of surrounding rock is superior to C and D stratum combination. The above results can provide guidance for the analysis of geological condition and the construction of Hefei metro tunnel.
The construction of metro tunnel is closely related to the geological conditions. Through summarizing the geological exploration data and the engineering data of the planned Hefei metro line 1～5, the distribution of geomorphic feature in Hefei area was also taken into consideration to study the geological conditions of shallow tunneling engineering of Hefei metro in depth. Three different methods including statistical analysis, numerical model and field measurement had been adopted to make the research more comprehensive and rigorous. The results indicate that the overall generalization of the engineering geological layer, namely, unifying and simplifying the serial number of strata by engineering geology, can be followed by the principle that "the sedimentary age of stratum is given to the priority with the application of geotechnical engineering as the complement" in Hefei area. According to the characteristics of stratigraphic section, the stratum combinations which Hefei metro tunnel might cross can be classified as A～D, among them A stratum combination is the most favorable for the tunnel construction, B stratum combination's ability to control the deformation of surrounding rock is superior to C and D stratum combination. The above results can provide guidance for the analysis of geological condition and the construction of Hefei metro tunnel.
引文
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[2]郭兆清.合肥滨湖新区工程地质类型与特性分析[J].工程与建设, 2015(2):236-238.
[3]郭兆清,刘毅.合肥轨道交通1号线沿线的工程地质特性分析[J].工程与建设, 2014(2):173-175.
[4]张万涛.合肥地区粘性土及白垩纪砂岩工程特性分析[J].山西建筑, 2013, 39(22):57-58.
[5]贾维瑞.合肥软岩风化层划分及评价研究[C]//中国地质学会.第六届全国工程地质大会论文集,中国地质学会:中国地质学会,2000:3.
[6]吴君虎,丁永坚.合肥浅层岩体工程特性与不同岩体复合部位的工程处理浅析[J].安徽建筑, 2012, 19(2):114-116.
[7]汤明玉.合肥市开发区工程地质条件综合评述[J].上海国土资源, 1999, 20(2):34-36.
[8]王国强.合肥市岩土体工程特征及地基划分[J].岩石力学与工程学报, 1999, 18(6):694-698.
[9] WAN YUSHENG,CHENG ZHENYU,ZHOU JIANXIONG,et al. Provenance of jurassic sediments in the Hefei Basin, east-central China and the contribution of high-pressure and ultrahigh-pressure metamorphic rocks from the Dabie Shan[J]. Earth&Planetary Science Letters,2005,231(3):279-294.
[10]李晓昭,罗国煜,龚洪祥,等.土体工程地质层组的划分[J].岩土力学, 2004, 25(5):759-763.
[11]周文海,李永东.基于岩土参数统计分析的地层划分研究[J].土工基础, 2017(4):481-485.
[12]北京市勘察设计研究院,北京市建筑设计研究院. DBJ11-501-209北京地区建筑地基基础勘察设计规范[S].北京:北京市规划委员会,2009-05-11.
[13] LI XIAO ZHAO,LUO GUO YU JIANG HUANG. Urban geoenvironmental variation issues caused by geotechnical engineering disturbances[C]//Proceedings of International Symposium on High Altitude and Sensitive Ecological Environmental Geotechnology,Nanjing:Nanjing University Press,1999:23-29.
[14]王康,孙熔正,杨新安.充填型浅巨岩溶隧道溶洞处理技术研究[J].华东交通大学学报,2018,35(3):23-28.