高地温地下工程支护混凝土研究现状及进展  

Research Status and Progress of Supporting Concrete for High Geothermal Underground Project

作　　者：范利丹[1,2] 徐峰 余永强 张纪云[1] 孙亮 杨蒙 FAN Li-dan;XU Feng;YU Yong-qiang;ZHANG Ji-yun;SUN Liang;YANG Meng(School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China;International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Jiaozuo 454000, China)

机构地区：[1]河南理工大学土木工程学院,焦作454000 [2]河南省地下空间开发及诱发灾变防治国际联合实验室,焦作454000

出　　处：《科学技术与工程》2022年第4期1308-1320,共13页Science Technology and Engineering

基　　金：国家自然科学基金(51778215);河南省科技攻关项目(212102310974);中铁隧道集团有限公司科技创新计划项目(H20-095)。

摘　　要：在系统分析高温对混凝土水化硬化的影响机理以及高温对混凝土结构带来的温度应力、强度和耐久性问题的基础上,针对高地温地下支护混凝土的研究和应用,总结了高温对围岩与喷射混凝土黏结强度、力学性能的作用机制,随后分别对矿物掺合料、轻质骨料、纤维等外掺料在提高混凝土的隔热性以及增强、阻裂等方面进行了综述,结果表明:矿物掺合料可降低体系早期的水化热,从而降低内外温差所产生的较大收缩以及温度附加应力诱导的微裂缝产生和扩展,以此改善混凝土后期强度和耐久性,并提高产生温度负效应的温度阈值;轻质多孔隔热材料引入混凝土可达到较好隔热效果,但往往导致力学性能降低;在掌握高地温对复合支护材料性能作用机理的基础上,通过添加轻质多孔材料、掺合料和纤维材料,充分发挥各组分的协同作用,以此达到高温环境中隔热与支护性能的均衡发展。介绍了目前在实验室模拟高地温环境及测试相关性能的实施方法,探讨了深入研究所需要关注和解决的问题,并对适用于高地温地下工程的支护材料进行了展望。The effect of high temperature on hydration and hardening of concrete,as well as the temperature stress,strength and durability of concrete support structure were comprehensively analyzed.Taking account of the research and application of supporting concrete in high geo-temperature environment,the effect mechanism on the bonding strength and mechanical properties of rock-shotcrete at high geo-temperature were summarized.Then,the effects of mineral admixtures,fibers,lightweight aggregates and other admixtures on improving the thermal insulation,strengthen and crack resistance were reviewed.The results show that the mineral admixtures could improve the strength and durability of concrete in the later period,as well as increase the temperature threshold of negative temperature effect on concrete performance.The lightweight porous insulation materials introduce into concrete could achieve the thermal insulation effect.But nevertheless,this often leads to the reduction of mechanical performance.Based on the good understanding and grasp of the mechanism of high geo-temperature on the performance of composite supporting material,the light porous materials,mineral admixtures,fiber materials are added to concrete,and give full play to the synergistic effect of each component to achieve the balanced development of thermal insulation and supporting strength.At the same time,the implementation methods of simulating high geo-temperature environment in laboratory were introduced.Finally,the problems relating to further research were discussed and the potential application material was prospected.

关 键 词：高地温 导热系数 矿物掺合料 轻质多孔材料 隔热机理 

分 类 号：TU528.59[建筑科学—建筑技术科学]