锦屏一级水电站地下厂房下游拱腰喷层裂缝成因分析  

CAUSE ANALYSIS OF CRACKS OF SHOTCRETE LAYER AROUND THE DOWNSTREAM HANCE IN UNDERGROUND POWERHOUSE OF JINPING I HYDROELECTRIC POWER STATION

作　　者：刘建友[1,2] 伍法权[1] 赵振华 李生清 祁生文[1] 刘彤[1] 董金玉[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]铁道部经济规划研究院,北京100038 [3]山东省地矿工程勘察院,山东济南250014

出　　处：《岩石力学与工程学报》2010年第A02期3777-3784,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国科学院知识创新工程(KZCX2–YW–109–2);国家自然科学基金资助项目(40772188);教育部长江三峡库区地质灾害研究中心开放基金(TGRC201025)

摘　　要：雅砻江锦屏一级水电站地下厂房的监测结果显示,下游拱腰处混凝土喷层开始出现鼓出开裂现象,随后裂缝持续扩展,喷层大量剥落;同时,下游拱腰处围岩位移和锚杆应力也显著增加。经过详细的现场地质调查,并结合厂房的受力情况进行数值计算,分析厂房下游拱腰处围岩变形破坏及混凝土喷层开裂剥落的原因。研究结果表明:高地应力和偏压作用在下游拱腰部位形成高强度的应力集中是导致该部位混凝土喷层开裂剥落的主要原因,主变室的开挖和围岩中第四组结构面的普遍发育加剧混凝土喷层的开裂和剥落。Monitoring results show that a lot of concrete shotcrete layer has fell and cracked around the underground powerhouse of Jinping I hydroelectric power station,and then many shotcrete layer are spalling with the crack development. Meanwhile,displacement of surrounding rock and bolt stress in the downstream hance of the powerhouse increases particularly. The cause analysis of deformation and failure of surrounding rock and the crack and spallig of concrete shotcrete layer around the downstream hance of the powerhouse is conducted by detailed field geologic survey and numerical calculation according to the force condition of underground powerhouse. The research results indicate that high level of stress concentration formed by high geostress and eccentric compression are the major factors which lead the concrete shotcrete layer at corresponding position to crack and spall;and the excavation of main transformer chamber and universal development of the fourth discontinuities aggravate the process.

关 键 词：水利工程 锦屏一级水电站 地下厂房 混凝土喷层开裂和剥落 高地应力 

分 类 号：TV22[水利工程—水工结构工程]