阳江抽水蓄能电站高压岔管开挖支护质量控制  

Quality Control of Excavation and Support of High-pressure Bifurcated Pipe in Yangjiang Pumped Storage Power Station

作　　者：李勇[1] 温有财 Li Yong;Wen You-cai

机构地区：[1]中国水利水电第七工程局有限公司,成都610213

出　　处：《建筑技术开发》2021年第19期129-132,共4页Building Technology Development

摘　　要：阳江抽水蓄能电站是国内在建、已建水头最高的水电项目,引水高压岔管是抽水蓄能电站重要组成部分。由于岔管平面小角度、多支管交叉跨度大、形体结构多变、受力复杂、围岩应力集中、开挖成型困难、施工安全风险高,传统的施工方法爆破振动导致岔口部位岩体开裂较为严重、围岩松动圈影响范围变大,岔口成型质量不佳。通过地质分析,按照平面、空间分区合理分序的原则及微差爆破控制技术,通过有限元三维模拟对施工方案进行比选,解决高水头钢筋混凝土岔管开挖围岩松动圈及岔管成型困难的质量问题。Yangjiang Pumped Storage Power Station is the highest water head hydropower project under construction and has been built in China. The diversion high-pressure bifurcated pipe is an important part of the pumped storage power station. Due to the small plane angle of bifurcated pipe,the large span of multi branch pipe crossing,the changeable shape and structure,the complex stress,the concentration of surrounding rock stress,the difficulty of excavation and forming,and the high risk of construction safety,the traditional construction method of blasting vibration causes the rock mass cracking at the bifurcated part to be more serious,the influence range of surrounding rock loosening circle to be larger,and the quality of bifurcated forming to be poorer. Through geological analysis,according to the principle of reasonable sequence division of plane and space division and millisecond blasting control technology,the construction schemes is selected through three-dimensional finite element simulation by comparison,so as to solve quality problems of high head reinforced concrete bifurcated pipe excavation surrounding rock loose circle and bifurcated pipe forming difficulties.

关 键 词：平面、空间分区合理分序 微差爆破控制技术 岔管平面小角度交叉 

分 类 号：TU974[建筑科学—建筑技术科学] TV743[水利工程—水利水电工程]