高地温隧洞喷混凝土—围岩粘结强度及微观破坏机理  

Cohesive Strength and Micro Failure Mechanism of High Geothermal Diversion Tunnel Shotcrete Surrounding Rock

作　　者：唐阳[1] 宿辉[1] 张宏 马秋娟[1] 蒋婷[1] 

机构地区：[1]河北工程大学水电学院,河北邯郸056038 [2]新华喀什齐热哈塔尔水电开发有限公司,新疆喀什844000

出　　处：《水电能源科学》2015年第4期127-129,63,共4页Water Resources and Power

摘　　要：针对深埋隧洞的高地温问题,利用温湿度试验控制系统模拟高地温隧洞内的湿热环境,通过钻芯拉拔法和扫描电镜测定高湿（湿度80%~85%）和低湿（湿度20%~25%）两种环境下在温度分别为50、60、75、90℃时围岩支护结构的粘结强度和粘结面的微观结构。研究结果表明,湿度对粘结强度的影响较大,相比于低湿环境,高湿环境下的围岩支护结构的粘结强度较大,且随着温度升高和湿度越低喷混凝土水化反应中止速度越快、混凝土干缩现象越严重、粘结强度越低,相较50℃,90℃时强度降幅最大为62.7%。研究结果可为湿热环境下实际工程建设提供指导。For the high geothermal problem of deep tunnel,the test control system of temperature and humidity was used to simulate the status of humid heat in high geothermal diversion tunnel.Under the circumstances of high humidity（humidity 80%-85%）and low humidity（humidity 20%-25%）,the cohesive strength of surrounding rock supporting structure and the cohesive surface microstructure were measured at the temperature of 50,60,75,90 ℃ by using core drawing method and scanning electron microscopy.The research results indicate that the humidity has an important influence on the cohesive strength;compared with the low humidity,the cohesive strength of rock surrounding structure is larger;the higher temperature and the lower humidity,the hydration reaction of shotcrete is faster and the dry shrinkage phenomenon of concrete is more obvious with lower of cohesive strength;compared with the temperature of 50℃,the largest strength decline amplitude is 62.7%for the temperature of 90℃.Therefore,the results can provide guidance for actual engineering construction under humid heat conditions.

关 键 词：高地温 粘结强度 引水隧洞 微观结构 温湿度控制系统 齐热哈塔尔水电站 

分 类 号：TV322[水利工程—水工结构工程]