摘要
针对锦屏一级水电站深部裂缝加固技术难题,在对深部裂缝工程地质特征及其灌浆加固技术特点分析基础上,对水泥-水玻璃控制性灌浆技术进行了研究。首先对水泥-水玻璃灌浆作用机理进行分析,然后主要从胶凝时间和强度两方面对水泥-水玻璃浆液进行试验研究,分析了水玻璃和缓凝剂加量对浆液胶凝时间和强度的影响规律,并按初凝时间为5min的情况进行了水泥-水玻璃浆液配比设计。最后,提出采用水泥-水玻璃双液孔口混合式灌浆方法,采用自上而下、孔口封闭、纯压式灌浆方式对深部裂缝进行固结灌浆加固处理。由此初步建立了锦屏一级深部裂缝灌浆加固处理技术研究方案。
This paper analyzes the features of deep rock cracks and grouting technology.It then studies the grouting technology with cement-silicate for controlling the deep rock cracks.It particularly addresses the problems of grouting in deep cracks in Jinping Ⅰ Hydropower.First of all,the paper analyzes the mechanism of cement-silicate grouting.Then,it investigates the cement-silicate slurry mainly from the aspects of gel time and strength.It studies the influence law of gel time and strength from the dosage of silicate and retarder.It obtains a design formula for 5min.cement-silicate slurry.Finally,the paper proposes the grouting method using two pipe outlets for mixing the two grout fluids.One pipe outlet is for the cement grout and the other for silicate grout.The grouting method further includes the top-down approach,closed hole,and pure pressure grouting,according to the characteristics of the deep rock cracks.Thus,the paper has initially established the research programs of grouting treatment technology for deep rock cracks at Jinping Ⅰ Hydropower.
出处
《工程地质学报》
CSCD
北大核心
2012年第2期276-282,共7页
Journal of Engineering Geology
基金
雅砻江水电开发联合研究基金重点项目(50539050)
地质灾害防治与地质环境保护国家重点实验室人才培养课题(SKLGP2010Z008)
关键词
锦屏一级水电站
深部裂缝
水泥-水玻璃
控制性灌浆
Jinping Ⅰ Hydropower
Deep rock cracks
Cement-silicate grout
Controlling grouting
