广花盆地东北部岩溶地质特征及对城际铁路隧道影响分析  

Characteristics of Karst in the Northeast Guanghua Basin and Analysis of its Influence on Intercity Railway Tunnels

作　　者：柳柳 王俊 Liu Liu;Wang Jun(China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100055,China)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055

出　　处：《铁道勘察》2022年第4期72-78,共7页Railway Investigation and Surveying

摘　　要：广花盆地作为我国典型的覆盖型岩溶发育区,在该区域进行城市工程建设易造成地面塌陷等地质灾害。以珠三角城际铁路新塘经白云机场至广州北项目为依托,通过研究广花盆地东北部区域地质资料,结合钻探和孔内摄像等方法,对覆盖层、基岩类型、溶洞发育位置和尺寸等数据进行统计分析,揭示不同碳酸盐岩、褶皱、断层破碎带、岩性接触带等分布特征,并进行全线岩溶风险分级评价。研究结果表明,受岩性和广花复向斜控制,该地区岩溶平面上整体呈与构造线走向平行的条带状分布,垂向发育程度随深度的增加而减弱;受流溪河沉积控制,南部邻河阶地覆盖层厚度大于北部支流地段。因线路大角度穿越构造走向线,平面难以绕避岩溶强烈发育区,根据岩溶和覆盖层特征,推荐机场T3站至机场T2站段采用盾构法,T2站至广州北站段采用明挖法,并采取合理岩溶加固措施来有效降低岩溶塌陷风险,保证工程安全。Guanghua basin is a typical covered karst area in China,and it is easy to occur karst ground collapses during the construction of urban engineering.Based on Pearl River Delta Intercity Railway(Xintang-Baiyun Airport Guangzhou North Railway Station Project),by studying regional geological data of northeast Guanghua basin and combining drilling and borehole camera,the data of overburden and bedrock types was analyzed,development position and the size of karst cave were discussed.The distribution characteristics of karst in different soluble rocks,fold,fault fracture and lithologic contact zone were carried out and the karst risk grade of the whole line was evaluated.The results show that,controlled by lithology and Guanghua syncline,the distribution of karst is parallel to the strike of structural line on the plane,and the vertical development degree decreases with the increase of depth.Controlled by sedimentation of Liuxihe river,the overburden thickness of the south riverside terrace is greater than that of the north tributary.Due to the fact that the line passes through the strike line of the structure at a large angle,it is difficult to avoid strong karst development area in the plane.Combined with the characteristics of karst and the overburden,it is recommended that the shield method is used in the section from T3 station to T2 station,and the open-cut method is used in the section from T2 station to Guangzhou north station.The reasonable karst reinforcement measures should be taken to effectively reduce the risk of karst collapse and ensure the safety of the project.

关 键 词：广花盆地 城际铁路 复向斜 岩溶发育特征 岩溶风险分级 施工工法 

分 类 号：U212.2[交通运输工程—道路与铁道工程] P641[天文地球—地质矿产勘探]