示踪实验在湾潭隧道涌水突泥判别中的应用  

Application of a tracing experiment in the prediction of water and mud inrush in the Wantan Tunnel

作　　者：徐啸川 徐光黎[1] 魏文豪 李溢渊 薛媛 Xu Xiaochuan;Xu Guangli;Wei Wenhao;Li Yiyuan;Xue Yuan(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074

出　　处：《地质科技通报》2023年第2期297-304,共8页Bulletin of Geological Science and Technology

基　　金：宜都至来凤高速公路(宜昌段)岩溶水文地质专项调查项目(2020K06-1)。

摘　　要：以宜来高速湾潭隧道为研究对象,通过现场调查、地下水示踪实验、地下水流量监测,以及采用大气降雨入渗法计算隧道的平均涌水量和丰水期涌水量,同时采用RFPA渗流软件对隧道涌突水的可能性进行判别。现场调查及示踪试验结果显示湾潭隧道岩溶管道为多支,混合型岩溶管道,水文地质条件复杂,丰水期涌水量约为平均隧道涌水量的4.6倍。数值模拟结果表明,隧道涌水突泥破坏要历经裂隙萌生、裂隙扩展、裂隙进一步扩展、贯通破坏阶段。同时当岩溶管道处的过水流量达到初始值(37248m^( 3)/d)约2.7~3.5倍之间时便可出现涌水突泥破坏,也即出水口2流量达到10000~13000m^( 3)/d时,湾潭隧道具有极高的涌水突泥风险。Taking the Wantan Tunnel of Yilai Highway as the study case,the average water inflow and the water inflow in the wet season of the tunnel are calculated through field investigation,groundwater tracer experiment,groundwater flow monitoring,and atmospheric rainfall infiltration method.Meanwhile,the realistic failure process analysis(RFPA)is used to analyze the possibility of tunnel water inrush is judged.The results of field survey and tracer test show that the karst pipeline of Wantan Tunnel is a multi-branched,mixed-type karst pipeline with complicated hydrogeological conditions.The water inflow in wet season is about 4.6 times of the average tunnel water inflow.Mud failure will go through the stages of crack initiation,crack expansion,further crack expansion,and through-through failure.At the same time,when the water flow at the karst pipeline reaches about 2.7 to 3.5 times the initial value(37248 m^( 3)/d),water gushing and mud inrush damage will occur,that is,when the flow of water outlet 2 reaches 10000 to 13000m^( 3)/d,There is a very high risk of water and mud gushing in the Wantan Tunnel.

关 键 词：宜来高速 示踪试验 大气降雨入渗法 岩溶管道 涌水突泥 

分 类 号：P642[天文地球—工程地质学]