摘要
有压盾构输水隧洞目前常用内外衬分离的受力模式,内外衬联合受力研究居多,但工程应用较少,在联合受力的研究上,内外衬的连接形式如何更优,相关研究就更少了。文中通过对内外衬之间采用光滑和整体连接2种连接方式进行分析,探讨了内外衬的受力性能的差异,尤其是在高压水发生内衬渗漏,积存在内外衬之间时,不同的连接对受力体系有着明显的影响。结果表明,在不发生内衬渗漏时,2种连接形式的受力变形差异并不大,当发生内衬渗漏时,随着外渗水压的逐渐增大,光滑连接的内衬逐渐退出受力分担体系,内压逐步转移至外衬以及围岩共同承担,而对于整体连接,发生内衬渗漏对受力体系的影响并不明显,内外衬始终能够发挥各自的功能,联合围岩以共同受力的形式承担内水压。在发生内衬渗漏时,若内外衬之间存在水压,则整体连接的受力体系要优于光滑连接。
At present,shield tunnel for pressure water conveyance is separation. Inside and outside liner respectively bear the load. The joint stress research is mostly,but the engineering application is less. In the joint stress research,how the connection form of the inner and outer lining is better even less. In this paper,the two kinds of connection methods between the inner and outer linings are analyzed by smooth and integral connection.The difference of the mechanical properties of the inner and outer linings is discussed,especially when the high pressure water leaks and accumulates between the inner and outer linings. It has a significant impact on the stress system. The results show that the difference between the two types of joints is not large when no leakage occurs. When the leakage occurs,the lining of the smooth connection gradually withdraws from the stress sharing system. The internal pressure is gradually transferred to the outer lining and the surrounding rock to bear,and for the overall connection,the impact of the leakage on the stress system is not obvious,the inner and outer linings can always play their respective functions,and the joint surrounding rock is in the form of common stress. In the event of leakage,if there is water pressure between the inner and outer linings,the overall connected stress system is superior to the smooth connection.
作者
杨光华
贾恺
徐传堡
姜燕
李志云
YANG Guanghua;JIA Kai;XU Chuanbao;JIANG Yan;LI Zhiyun(Guangdong ResearchInstitute of Water Resources and Hydropower,Guangzhou 510635,China;Guangdong Research Center of Geotechnical Engineering Technology,Guangzhou 510635,China;Department of Civil Engineering,South China university of technology,Guangzhou 510641,China)
出处
《广东水利水电》
2020年第2期45-50,共6页
Guangdong Water Resources and Hydropower
基金
国家自然科学基金(编号:51778152)
广东省科技计划项目(编号:2019B020208003)
关键词
盾构输水隧洞
有压输水
复核衬砌
联合受力
内外衬连接
shield tunnel
pressure water conveyance
composite lining structure
joint stress
lining connection
