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中文摘要：
双护盾掘进机掘进与管片衬砌几乎同时进行,具有快速施工的特点,但管片衬砌能否承受电站引水隧洞高内水压力作用,是决定引水隧洞能否采用管片衬砌及TBM施工的关键之一。结合青松电站引水隧洞,对管片衬砌在承受高内水压力作用下的应力与变形特性进行三维有限元计算,对影响管片接缝张开的主要因素进行分析,获得在高内水压力作用下的管片应力、变形分布,深化对高内水压力作用下的管片衬砌特性的认识。计算发现在内水压力作用下,管片衬砌具有柔性变形特征,就青松电站而言,在现有的接缝止水技术条件下,管片衬砌可承受高水头内水压力作用,这对推动管片衬砌及TBM在引水隧洞中的应用具有重要意义。
英文摘要：
With the special characteristics of fast tunneling,the double-shield TBM is suitable for long tunnel construction.But for pressure tunnel in hydropower engineering,the loading capacity of segment lining for tunnel under high inner water pressure is one of the keys to determine whether the segment lining is feasible and the double-shield TBM can be used for the tunnelling construction.Combined with the long pressure tunnel of the Qingsong Hydropower Project,the characteristics of deformation and stress distribution of segment lining are evaluated by calculation with 3D FEM,the important influential factors are analyzed,the stress and strain distributions in different conditions are obtained,and the knowledge for segment lining characters is deepened.It is found that the segment lining has the character of flexibility,and under the present technology of joint water-seal,as far as the Qingsong Hydropower Project is concerned,the segment lining can sustain the high inner water pressure.The conclusion is helpful for application of segment lining and double-shield TBM in hydropower engineering in China.
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