川藏铁路拉月隧道穿越东构造结地温分布特征及预测

王生仁; 张晓宇; 杜世回; 漆继红; 张文忠; 黄勇; 常帅鹏

doi:10.3973/j.issn.2096-4498.2021.01.011

隧道建设 >

0 100 - 107

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.01.011

规划与设计

川藏铁路拉月隧道穿越东构造结地温分布特征及预测

王生仁 ,
张晓宇 ,
杜世回 ,
漆继红 ,
张文忠 ,
黄勇 ,
常帅鹏

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（1. 中铁第一勘察设计院集团有限公司，陕西西安 710043; 2. 陕西省铁道及地下交通工程重点实验室（中铁一院），陕西西安 710043; 3. 成都理工大学地质环境保护及地质灾害防治国家重点实验室，四川成都 610059）

王生仁(1972—),男，甘肃环县人，1996 年毕业于西南交通大学,水文地质与工程地质专业，本科，高级工程师，主要从事铁路工程地质勘察工作。E-mail: 425438794@qq.com。

网络出版日期: 2021-02-08

基金资助

西藏自治区重点研发计划项目（XZ202001ZY0011G）；铁一院科研（川藏19-09）；陕西省科技厅自然科学基础研究计划项目（2020JQ-999）

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Geothermal Distribution Characteristics and Prediction of Layue Tunnel of SichuanTibet Railway Passing through East Syntaxis

WANG Shengren ,
ZHANG Xiaoyu ,
DU Shihui ,
QI Jihong ,
ZHANG Wenzhong ,
HUANG Yong ,
CHANG Shuaipeng

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(1. China Railway First Survey and Design Institute Group Co., Ltd., Xi′an 710043, Shaanxi, China; 2. Shaanxi Railway and Underground Traffic Engineering Key Laboratory, Xi′an 710043, Shaanxi, China; 3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China)

Online published: 2021-02-08

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摘要

川藏铁路拉月隧道受地热影响, 针对其线路方案选择及高温热害难题，通过开展地热地质构造调查、钻孔勘探测温，获取研究区地温及地温梯度分布规律。同时，通过分析地下水对地温的影响，确定选线原则，预测隧道地温。结果表明： 1）研究区高地温问题普遍存在，实测地温最大值达93.5 ℃，地温梯度达40 ℃/100 m； 2）地温梯度垂向上存在明显的分层特征，平面上的差异性与构造、地形切割、海拔高程关系密切。结合其他选线因素，建议线路离雅鲁藏布江缝合带一定距离并通过抬高线路标高来减少高温热害。根据建立的基于地表恒温层温度、恒温层深度、地温梯度变化的地温计算公式，预测出拉月隧道存在大于60 ℃热害严重地段。

关键词： 川藏铁路; 东构造结; 拉月隧道; 米林断裂; 地温梯度; 地温预测; 高温热害

本文引用格式

王生仁 , 张晓宇 , 杜世回 , 漆继红 , 张文忠 , 黄勇 , 常帅鹏 . 川藏铁路拉月隧道穿越东构造结地温分布特征及预测[J]. 隧道建设, 0 : 100 -107 . DOI: 10.3973/j.issn.2096-4498.2021.01.011

Abstract

The Layue tunnel of the SichuanTibet railway is influenced by geothermal heat. Thus, geothermal and geological structure surveys, borehole explorations, and temperature measurements are conducted to obtain the optimal tunnel route and to avoid hightemperature hazards. Then, the distributions of the geotherm and geothermal gradient are determined. By analyzing the influence of groundwater upon the geotherm, the principles of line selection are determined. The geothermal test data and geothermal curves show that: (1) High geotherms are a common hazard in the test area and the maximum measured geotherm and geothermal gradient are 93.5 ℃ and 40 ℃/100 m, respectively; (2) Obvious stratification characteristics exist in the vertical direction of the geothermal gradient, and the difference in this plane is closely related to the structure, topographic cutting, and elevation. Based on 〖JP+1〗this analysis, it is recommended that the line should be built far away from the Yarlung Zangbo River suture zone, and that the altitude of the line should be elevated to reduce hightemperature hazards. According to the established geothermcalculation formula based on constanttemperature surface, constanttemperature layer thickness and geothermal gradient, it is predicted that there might be a section with a severe geotherm above 60 ℃ in Layue tunnel.

Key words： SichuanTibet railway; east syntaxis; Layue tunnel; Milin fault; geothermal gradient; geotherm prediction; hightemperature hazard

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