深埋圆拱形隧洞围岩流场及涌水流速分布的解析研究  

Analytical study of groundwater flow field and inrush flux distribution for deeply-buried circular arched tunnels

作　　者：卫云波 王锦国[1] 陈舟[1] 郑克勋 WEI Yunbo;WANG Jinguo;CHEN Zhou;ZHENG Kexun(School of Earth Science and Engineering,Hohai University,Nanjing,Jiangsu 210046,China;Power China Guiyang Engineering Corporation Limited,Guiyang,Guizhou 550081,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京210046 [2]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《水文地质工程地质》2024年第6期18-24,共7页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金青年基金项目(42102282);贵州省科技支撑计划项目(黔科合支撑[2022]一般212);贵州省科技平台及人才团队建设计划项目(黔科合平台人才[2021]5635);江苏省自然科学基金青年基金项目(BK2021041973)。

摘　　要：近年来,随着我国交通工程、采掘工程、地下空间工程以及长距离引调水工程建设的不断发展,隧洞突涌水灾害发生越来越频繁。但是目前针对圆拱形隧洞围岩流场的解析研究较少,使用保角变换方法求解圆拱形深埋隧洞涌水量及围岩流场的解析解,探讨了圆拱隧洞洞壁涌水流速的分布规律。研究发现:在圆拱形隧洞洞壁附近,地下水流场受隧洞形状影响较为明显,而在远离洞壁处,隧洞形状对地下水流场的影响可等效为圆形隧洞;圆拱形隧洞洞壁涌水流速的最大值出现在底板左右两端的转折点(即洞底脚)附近,而流速最小值位于底板中心点;洞底脚流速可达底板中心点流速的3倍以上;隧洞截面形状越接近于圆形,洞壁各点涌水流速的相对差距越小。研究成果可为圆拱形隧洞涌水量预测及围岩地下水流场刻画提供理论依据,为隧洞施工方案设计以及防渗/排水措施设计提供有力支撑。With the development of transportation engineering,mining engineering,underground space engineering,and long-distance water diversion projects in China,the occurrence of tunnel water inrush disasters has become increasingly frequent.Due to the limited analytical study on the flow field of circular arched tunnels,an analytical solution for the water inrush and the flow field in the surrounding rock around a deep-buried circular arched tunnel was obtained using the conformal transformation method.Then the distribution of water inrush around the tunnel circumference was explored.The results reveal that the groundwater flow field near the tunnel is significantly influenced by the tunnel shape,while its influence on the groundwater flow field further away from the tunnel can be approximated as that of a tunnel with a circular cross-section.The maximum flow velocity around the circular arched tunnel occurs near the inflection points(i.e.,the corners of the tunnel bottom),while the minimum flow velocity is located at the center of the tunnel floor.The flow velocity at the corners of the tunnel bottom can exceed three times the flow velocity at the center of the tunnel floor.As the tunnel shape approaches a circle,the relative differences of flow velocities at various points around the tunnel circumference gradually decrease.This study can provide a theoretical basis for estimating the water inrush flux and characterizing the groundwater flow field in the surrounding rock around circular arched tunnels,and support for tunnel construction planning and the design for tunnel groundwater seepage/drainage.

关 键 词：保角映射 隧道 地下水 突涌水 渗流 解析法 

分 类 号：P641.2[天文地球—地质矿产勘探] TU46[天文地球—地质学]