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工程科学与技术:2022,54(4):20-28
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鲜水河断裂热水焓–质关系对隧道工程热害的指示
(1.成都理工大学 地质灾害防治与地质环境保护国家重点实验室,四川 成都 610059;2.中铁二院工程集团有限责任公司,四川 成都 610031)
Indication of Enthalpy–Mass Relationship of Xianshuihe Fault Zone to Thermal Damage in Tunnel Engineering
(1.State Key Lab. of Geohazard Prevention and Geoenvironment Protection, Chengdu Univ. of Technol., Chengdu 610059, China;2.China Railway Eryuan Eng. Group Co. Ltd., Chengdu 610031, China)
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投稿时间:2021-09-15    修订日期:2021-12-09
中文摘要: 川藏铁路雅安至康定段穿过鲜水河断裂带,该断裂带不仅构造发育,且水热活动强烈,隧道穿越断裂带面临复杂多变的水热灾害问题。为准确预测热害问题,需要对水热循环过程、运移通道特征进行深入分析。由于水热系统的复杂性,尚无法将目前对该断裂带内热储特征、热水运移模式的研究成果较好地应用于隧道工程热害预测中。本文对该水热系统的水岩平衡、硅–焓特征、氯–焓特征等多种焓–质关系进行综合分析,推断水热体系的多级热储特征,分析热储间的关联并推算热储温度,建立榆林宫至道孚段热水运移与冷却过程的概念模型。考虑非平衡及冷水混合因素,采用阳离子温标及硅–焓关系推算,得出榆林宫、二道桥、中谷热水的直接热储温度比较接近,为228~242 ℃,八美与道孚则明显偏低;氯–焓关系显示二道桥、中谷热水升流分离位置浅于八美、道孚热水,且二道桥热水体系的混合程度最高。分析认为:榆林宫至道孚段水热体系以榆林宫为中心,热水经过绝热冷却、热传导及混合的复合过程,沿北西方向不同深度的通道运移、冷却,在榆林宫至道孚形成多个热害类型和程度不同的隧道工程热害危险区。隧道从不同部位穿越鲜水河断裂带时,涉及的水热活动特征不同,遭遇的热害类型、危险程度存在差异。选择二道桥与中谷之间的区域Ⅲ作为铁路穿越鲜水河断裂带的位置具有合理性,但需要避开冷热水混合的含水岩层,施工时要注意配合疏排大量热水。
Abstract:The section from Ya’an to Kangding of the Sichuan-Tibet railway passes through the Xianshuihe fault. The fault zone develops not only geological structure, but also hydrothermal activity strongly, which makes the construction process of the tunnel crossing the fault zone face complex and changeable problems of hydrothermal disasters. To accurately predict the heat damage, it is necessary to deeply analyze the characteristics of the hydrothermal cycle and migration channel. However, due to the complexity of the hydrothermal system, the research results of thermal reservoir characteristics and hot water migration mode in the fault zone cannot be applied to the prediction of heat damage in tunnel engineering. Based on the comprehensive analyses of water-rock balance, silicon-enthalpy characteristic, chlorine-enthalpy characteristic, and other enthalpy and mass relations of the hydrothermal system, the multistage thermal reservoir characteristics of the hydrothermal system were deduced, the correlation between the thermal reservoirs was analyzed, the thermal reservoir temperature was calculated, and the conceptual model of the migration and cooling process of the hot water from Yulingong to Daofu section was established. The cationic temperature scale and silicon-enthalpy relationship was used to calculate the direct thermal reservoir temperatures of Yulingong, Erdaoqiao, and Zhonggu hot water, which were close in the range of 228~242 ℃, while the temperature of Bamei and Daofu was obviously low. The chlorine-enthalpy relationship showed that the upwelling separation position of Erdaoqiao and Zhonggu hot water was shallower than that of Bamei and Daofu hot water.?The mixing degree of the Erdaoqiao hot water system was the highest. The analyses showed that the hydrothermal system from Yulingong to Daofu takes Yulingong as the center, and the hot water moved and cooled along the passage at different depths in the northwest direction through the compound process of adiabatic cooling, heat conduction and mixing, forming multiple thermal hazard areas of tunnel engineering with different types and degrees of thermal damage. When the tunnel passes through the Xianshuihe fault zone from different parts, the characteristics of hydrothermal activity involved were different, and the types of thermal damage encountered and the degrees of danger were different. It is reasonable to choose area Ⅲ between Erdaoqiao and Zhonggu as the location where the railway crosses the Xianshuihe fault zone, but it is necessary to stay clear of the water-bearing rock stratum mixed with cold and hot water and pay attention to the drainage of plenty of hot water during engineering construction.
文章编号:202100932     中图分类号:P314    文献标志码:
基金项目:中国国家铁路集团有限公司科技研究开发课题(P2018G047–07);四川省科学技术厅2019年科技计划重点项目(2019YFG0460);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2015Z013)
作者简介:第一作者:利满霖(1997-),男,硕士生.研究方向:水文地质与地热地质.E-mail:Limanlin0620@foxmail.com;通信作者:漆继红,E-mail:qijihong@cdut.cn
引用文本:
利满霖,徐正宣,漆继红,许模,易磊,李潇.鲜水河断裂热水焓–质关系对隧道工程热害的指示[J].工程科学与技术,2022,54(4):20-28.
LI Manlin,XU Zhengxuan,QI Jihong,XU Mo,YI Lei,LI Xiao.Indication of Enthalpy–Mass Relationship of Xianshuihe Fault Zone to Thermal Damage in Tunnel Engineering[J].Advanced Engineering Sciences,2022,54(4):20-28.