水热活动带下的隧道热害特征与成因分析  

Characteristics and Causes of Tunnel Thermal Damage in Hydrothermal Activity Zones

作　　者：刘星辰 黄锋[1,2] 陈树汪 王安民 杨冬 LIU Xingchen;HUANG Feng;CHEN Shuwang;WANG Anmin;YANG Dong(State Key Laboratory of Bridge and Tunnel Engineering in Mountainous Areas Jointly Constructed by the Ministry and the Province,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Yunnan Transportation Planning,Design and Research Institute Co.,Ltd.,Kunming 650051,Yunnan,China)

机构地区：[1]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [2]重庆交通大学土木工程学院,重庆400074 [3]云南省交通规划设计研究院有限公司,云南昆明650051

出　　处：《重庆交通大学学报（自然科学版）》2024年第3期35-44,共10页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(52078090);重庆市自然科学基金项目(cstc2020jcyj-msxmX0679);重庆市研究生科研创新项目(CYB22229);山区桥梁及隧道工程国家重点实验室开放基金项目(SKLBT-19-006;SKLBT-YF2106)。

摘　　要：滇西地区的地热资源丰富,部分隧道工程在穿越水热活动带时会面临高温挑战,严重影响施工质量与进度。为揭示水热活动带下的隧道热害特征,以腾越隧道为例,采用地质构造勘察法和温泉地球化学分析方法对该区域内的水热活动循环模式进行了研究;基于大地热流值对区域地温带进行了划分,利用SiO_(2)地热温标对隧道热害进行了预测。分析结果表明:受地质构造影响,该区域水热活动的热源来自火山岩浆,褶皱与断裂是热水循环增温的主要通道,水源补给则来自大气降雨,热水循环、增温、径流期间的水岩反应导致水体Ca^(2+)上升;腾越隧道沿线以中、低温地热系统为主,该区域内的热量传递以热传导为主,隧道全线的热害占比高达87.3%。Abundant geothermal resources in the western part of Yunnan Province present a challenge for partial tunnel projects in dealing with high temperatures when crossing hydrothermal activity zones,seriously affecting construction quality and progress.To reveal the thermal damage characteristics of tunnels through hydrothermal active zones,geological structure survey methods and geochemical analysis of hot springs were employed to study the hydrothermal activity cycle modes in the region by taking Tengyue Tunnel as an example.Based on the heat flux value of the earth,the regional geothermal zone was divided,and the SiO_(2) geothermometer was utilized to predict tunnel thermal damage.Analysis conclusions indicate that,influenced by geological structures,the heat source of hydrothermal activity in this region originates from volcanic magma.Folds and fractures act as the primary pathways for the circulation and heating of hot water,with water supply replenished by atmospheric rainfall.Water-rock reactions during the circulation,heating,and runoff phases of hot water lead to an increase of Ca^(2+)in the water.Along the Tengyue Tunnel alignment,the dominant geothermal systems are of medium to low temperature.Heat transfer in this area is mainly through heat conduction,and the proportion of thermal damage along the entire tunnel is as high as 87.3%.

关 键 词：隧道工程 地质工程 隧道热害 水热活动带 地质构造 地球化学特征 热水循环模式 

分 类 号：U452.11[建筑科学—桥梁与隧道工程] P642.4[交通运输工程—道路与铁道工程]