友谊隧道盐岩工程地质特征及防治对策  

The Engineering Characteristics and Prevention Countermeasures of Salt Rock in Friendship Tunnel

作　　者：常兴旺[1] 宋章[1] 赵平[1] 杜宇本[1] 陈伟[1] 张明红[1] 王利 CHANG Xingwang;SONG Zhang;ZHAO Ping;DU Yuben;CHEN Wei;ZHANG Minghong;WANG Li(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2021年第6期26-31,共6页Journal of Railway Engineering Society

基　　金：中国国家铁路集团有限公司科技项目(K2018G060);中铁二院工程集团有限责任公司科研项目(KYY2020018(20-22)/KYY2020022(20-22))。

摘　　要：研究目的:中老铁路是"一带一路"重要组成部分,友谊隧道为跨境连接中老两国的隧道。隧址区分布的第三系(E_(1-2))泥岩夹砂岩、砾岩的地层中含盐岩和石膏。本文基于现场调绘、掌子面素描、竖向及超前水平钻探等手段,查明盐岩的空间展布形态;基于取样试验和调研类比分析等工作,研究盐岩的工程地质特性,在此基础上探讨其工程防治对策,以期为友谊隧道设计施工提供科学的地质数据支撑。研究结论:(1)隧址区盐岩空间展布无规律性明显,呈条带状、透镜状、鸡窝状、网纹状、脉状等复杂形态产出,相变较快,成岩环境特殊复杂;(2)盐岩的主要成分为石盐,呈不均匀分布,含量处于30%~80%之间;(3)盐岩易溶于水,具强溶解性,干湿交替环境下具有强侵蚀性,具遇水软化及重结晶膨胀的特性;(4)针对盐岩的强侵蚀性、强溶解性和膨胀性,工程防治措施:一是加强防排水设计施工和抗腐蚀措施;二是加强隧道的支护结构措施;三是设计施工中预留足够的结构安全冗余措施;四是建议完善后期结构的监控量测措施和信息反馈机制,确保运营安全;(5)本研究成果对类似地质条件下的工程建设具有借鉴意义。Research purposes: The China-Laos railway is an important part of "the belt and road initiative", and Friendship Tunnel of China-Laos railway is a cross-border tunnel connecting China and Laos. The bearing salt rocks and gypsum in the Tertiary(E_(1-2)) mudstone interbeds with sandstone and conglomerate distributed in the tunnel site area. In order to provide scientific geological data support for the design and construction of Friendship Tunnel on the China-Laos railway, based on the field mapping, face sketch, vertical and advanced horizontal drilling, this paper found out the spatial distribution form of salt rock, and based on the sampling test, investigation and analogy analysis, studied the engineering geological characteristics of salt rock, and on all these counts, the engineering prevention countermeasures were discussed.Research conclusions:(1)The spatial distribution of salt rock in tunnel site was irregular, and it was produced in complex forms such as strip, lenticular, chicken nest, reticulate and vein, with the lithofacies change rapidly and the particularly complex diagenetic environment.(2)The main component of salt rock was rock salt, which was unevenly distributed and the content is between 30% and 80%.(3)The salt rock was easily soluble in water, with strong solubility, strong aggressiveness in wet-dry alternating environment, softening in water and recrystallization swelling.(4)In view of the strong erosivity, strong solubility and expansibility of salt rock, the engineering prevention countermeasures included: The first was to strengthen the waterproof and drainage design and construction and anti-corrosion measures;The second was to strengthen the tunnel support and protection structure measures;Third, sufficient structural safety redundancy measures should be reserved in design and construction;Fourth, it was suggested to improve the monitoring and measurement measures and information feedback mechanism of the later structure to ensure operational safety.(5)The research results have referen

关 键 词：一带一路 中老铁路 盐岩 化学侵蚀性 防治措施 

分 类 号：P642.2[天文地球—工程地质学]