摘要
隧道作为铁路穿越青藏高原中东部水热活动区的重要工程形式,探讨其遭受水热灾害的影响因素在隧道热害研究方面是有必要的。隧道热害预测手段是综合性的,其中水文地球化学方法因易实施、性价比高而被广泛应用。热储温度是水热系统研究的重要参数,热储温度的推算因体系的复杂性很难全面考虑其地球化学作用过程而发生偏差。热储温度的Mg^(2+)校正受热水作用的岩石类型、运移速率和热储构造条件的影响,因此采用Mg^(2+)校正可以辅助分析多类型水热循环机制,据此可对隧道穿越水热体系遭遇的热害特征进行辨识。利用温标平衡理论,构建富Mg体系平衡判定的Na-K-Ca三角图,基于水热体系作用地质背景进行平衡点梳理,探讨青藏高原中东部典型水热体系中Mg^(2+)校正特征与影响因素的关系,对多类型水热循环条件、水岩作用、传热传质机制进行分析、比较,辅助对工程中地热带来的高岩温、热水涌突、围岩裂化等危害的分析。此方法是水文地球化学对工程热害预测的方法性讨论,也能为青藏高原中东部及未来在该区域实施交通干线的热害防控提供理论分析基础。
Tunnel is an important engineering form of railway crossing the middle and eastern part of the Qinghai-Tibet Plateau.It is necessary to discuss the influencing factors of tunnel thermal disaster.The methods of tunnel heat damage prediction are comprehensive,among which the hydrogeochemical method is widely used because of its easy implementation and high cost performance.Heat storage temperature is an important parameter in the study of hydrothermal system.Due to the complexity of the heat storage system,it is difficult to fully consider the geochemical process in the calculation of heat storage temperature,and deviation may take place in heat storage temperature calculation.The Mg^(2+ )correction of heat storage temperature is affected by the rock type,migration rate and structural conditions of heat storage under the action of hot water.Therefore,the Mg^(2+) correction can be used to assist the analysis of multi-type hydrothermal cycling mechanism.Based on this,the characteristics of heat damage encountered by the tunnel through the hydrothermal system can be identified.The Na-K-Ca triangle diagram of equilibrium judgment of Mg-rich system was constructed by using the equilibrium theory of temperature scale.Based on the geological background of hydrothermal system action,the equilibrium sample points were combed to discuss the relationship between the correction characteristics of Mg^(2+ )and the influencing factors in the typical hydrothermal system in western Sichuan and eastern Tibet.The various types of hydrothermal cycling conditions,water-rock interaction,heat and mass transfer mechanism in central and eastern Qinghai-Tibet Plateau were analyzed and compared,which can assist in the analysis of hazards such as high rock temperature,hot water inrush and surrounding rock cracking caused by geothermal in engineering.This method is a methodological discussion about hydrogeochemical prediction of engineering heat damage,and can also provide a theoretical basis for heat damage prevention and control in the middle and eastern part of the Qinghai-Tibet Plateau and in the future.
作者
利满霖
漆继红
许模
张广泽
张晓宇
李潇
易磊
常帅鹏
LI Manlin;QI Jihong;XU Mo;ZHANG Guangze;ZHANG Xiaoyu;LI Xiao;YI Lei;CHANG Shuaipeng(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,Sichuan,China;China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,Sichuan,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,Shaanxi,China)
出处
《地质通报》
CAS
CSCD
北大核心
2021年第12期2098-2109,共12页
Geological Bulletin of China
基金
中国国家铁路集团有限公司项目《川藏铁路深埋长大隧道复杂水-热灾害控制关键技术研究》(编号:P2018G047-07)
四川省科学技术厅科技计划重点项目《川藏铁路重大工程风险识别与对策研究子题5-川藏铁路沿线高地温灾害特征识别、形成演化机理、风险评估及减灾选线研究》(编号:2019YFG0460)
2020年度成都理工大学中青年骨干教师发展资助计划(编号:20200624)。
关键词
Na-K-Ca温标
Mg^(2+)校正
青藏高原中东部
水热机制辨识
temperature scale of Na-K-Ca
correction of Mg^(2+)
central and eastern Qinghai-Tibet Plateau
identification of hydrothermal mechanism
