铁路高地热隧道衬砌混凝土延迟钙矾石生成风险分析  

Risk analysis of delayed ettringite formation in concrete lining of railway high geothermal tunnels

作　　者：仲新华 渠亚男 裘智辉 李享涛 王家赫 ZHONG Xinhua;QU Yanan;QIU Zhihui;LI Xiangtao;WANG Jiahe(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Beijing Tieke Special Engineering Technological Co.,Ltd.,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国铁道科学研究院集团有限公司高速铁路轨道技术国家重点实验室,北京100081 [3]北京铁科特种工程技术有限公司,北京100081

出　　处：《混凝土》2022年第3期6-9,共4页Concrete

基　　金：中国铁路总公司科技研究开发计划(P2018G047);中国铁道科学研究院基金(2018YJ044,2019YJ034)。

摘　　要：在分析DEF的产生和破坏作用机制的基础上,根据铁路高地热隧道施工过程中温度的变化条件,分别对隧道初支和二衬混凝土或砂浆试件进行DEF加速模拟试验。试验结果表明,采用符合现行铁路混凝土技术标准要求的原材料,并对配制参数进行合理控制的前提下,混凝土或砂浆试件的膨胀率均低于0.04%的安全限值。说明铁路高地热隧道衬砌混凝土产生DEF破坏的风险很低,高地热环境对混凝土耐久性的影响较小。On the basis of analyzing the generation and failure mechanism of DEF,according to the temperature change condition during the construction of railway high geothermal tunnel,the simulation test of DEF acceleration was carried out on the initial branch of tunnel and the concrete or mortar specimens.The test results show that the expansion rate of concrete or mortar specimens is lower than the safety limit of 0.04%under the premise of using raw materials conforming to the current technical standards of railway concrete and reasonable control of the preparation parameters.This indicates that the risk of DEF damage caused by lining concrete of railway high geothermal tunnel is very low,and the influence of high geothermal environment on concrete durability is small.

关 键 词：隧道 高地热 混凝土 DEF 膨胀 

分 类 号：TU528.01[建筑科学—建筑技术科学]