科技通报
科技通報
과기통보
BULLETIN OF SCIENCE AND TECHNOLOGY
2015年
1期
103-107
,共5页
高外水压力%复合承载结构%衬砌%渗流%破裂%减压孔
高外水壓力%複閤承載結構%襯砌%滲流%破裂%減壓孔
고외수압력%복합승재결구%츤체%삼류%파렬%감압공
high external hydraulic pressure%composite bearing structure%lining%seepage%fracture%relief pressure hole
锦屏二级水电站引水隧洞地下水位高，电站运行期间引水隧洞将承受巨大的外水压力，特别是由于锦屏大理岩所表现出的破裂扩展的时间效应现象，更加大了工程运行期的风险。为此采用了全长钢筋混凝土衬砌方案，与岩体的初期支护和固结灌浆圈形成复合承载结构一起共同保证围岩的稳定。通过分析衬砌结构和灌浆对围岩稳定的作用机理，揭示了复合承载结构对于隧洞长期稳定的重要性，并通过三维渗流场分析计算了减压孔对于衬砌结构的重要性，确定了衬砌边缘的外水压力，计算结果表明按照现有的设计方案能够保证结构的整体稳定性。
錦屏二級水電站引水隧洞地下水位高，電站運行期間引水隧洞將承受巨大的外水壓力，特彆是由于錦屏大理巖所錶現齣的破裂擴展的時間效應現象，更加大瞭工程運行期的風險。為此採用瞭全長鋼觔混凝土襯砌方案，與巖體的初期支護和固結灌漿圈形成複閤承載結構一起共同保證圍巖的穩定。通過分析襯砌結構和灌漿對圍巖穩定的作用機理，揭示瞭複閤承載結構對于隧洞長期穩定的重要性，併通過三維滲流場分析計算瞭減壓孔對于襯砌結構的重要性，確定瞭襯砌邊緣的外水壓力，計算結果錶明按照現有的設計方案能夠保證結構的整體穩定性。
금병이급수전참인수수동지하수위고，전참운행기간인수수동장승수거대적외수압력，특별시유우금병대리암소표현출적파렬확전적시간효응현상，경가대료공정운행기적풍험。위차채용료전장강근혼응토츤체방안，여암체적초기지호화고결관장권형성복합승재결구일기공동보증위암적은정。통과분석츤체결구화관장대위암은정적작용궤리，게시료복합승재결구대우수동장기은정적중요성，병통과삼유삼류장분석계산료감압공대우츤체결구적중요성，학정료츤체변연적외수압력，계산결과표명안조현유적설계방안능구보증결구적정체은정성。
The underground water level of Jinping II diversion tunnel is so high, that the power station in run-time will suffer enormous external hydraulic pressure, especially the marble of Jinping show time-dependent failure phenomenon, and increase the risk in run-time. For this reason, the reinforced concrete lining is adopted, and combine with the primary support and the consolidation grouting to form a composite bearing structure to ensure the stability of surrounding rock. According to the mechanism of lining structure and grouting on the surrounding rock stability, the importance of the composite bearing structure for the long-term stability of tunnel was revealed. By the three-dimensional seepage field analysis to reveal the importance of the relief pressure hole for the lining structure, and the pressure of lining edge is determined. The calculation results show that, in accordance with the existing design scheme, the whole stability of the structure can be guaranteed.
