基于压缩及油脂逃逸试验的盾尾刷性能评价研究  

Performance evaluation of shield tail brushes based on compression and grease escape tests

作　　者：竺维彬 刘昶 钟小春[2] 游智 朱能文 ZHU Weibin;LIU Chang;ZHONG Xiaochun;YOU Zhi;ZHU Nengwen(Guangzhou Metro Group Co.,Ltd.,Guangzhou 510220,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China)

机构地区：[1]广州地铁集团有限公司,广东广州510220 [2]河海大学土木与交通学院,江苏南京210098 [3]广州地铁设计研究院股份有限公司,广东广州510010

出　　处：《岩土工程学报》2023年第5期1086-1093,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(52178387,51678217)。

摘　　要：盾尾密封失效事故时有发生,严重时易造成了重大涌水涌砂安全事故,已经引起工程界与学术界的高度关注。基于盾尾刷动态压缩试验和盾尾密封油脂逃逸试验结果及分析,结果表明:①动态压缩试验测试结果能较好反映盾尾刷弹塑性力学性能,大幅度节约试验时间;②随着盾尾间隙不断减小,盾尾刷贴合力、弹性系数不断增大,塑性变形占比不断增大、弹性变形占比不断减小。盾尾间隙为110 mm时弹性变形占比为90%,盾尾间隙压缩至50 mm时弹性变形占比降低到60%;③建立了盾尾间隙、盾尾油脂逃逸量与盾尾刷贴合力关系图,获得了盾尾密封系统的工作安全区域,可对盾尾密封状态有效性进行评估。建立的盾尾刷密封性能评价方法,为盾尾刷性能评价及检测提供了参考。The failures of shield tail sealing have occurred from time to time,which may result in water and sand-gushing accidents in severe cases.This phenomenon has attracted great attention from the engineering and academic circles.According to the tests of dynamic compression and sealing grease escape of shield tail brushes,the results show that:(1)The dynamic compression tests can reflect the mechanical properties of the shield tail brushes,and save the test time greatly.(2)With the decrease of the shield tail gap,the adhesion force and elastic coefficient of the shield tail brushes increase continuously,the proportion of plastic deformation increases,and that of elastic deformation decreases.When the shield tail gap is 110 mm,the proportion of elastic deformation is 90%,and when it is compressed to 50 mm,the proportion of elastic deformation reduces to 60%.(3)The relationship among the gap,grease escape and adhesion force of shield tail is established,and the working safety area of the shield tail sealing system is obtained so as to evaluate the effectiveness of the status of shield tail sealing.The evaluation method for the performance of shield tail sealing is established,and can provide a reference for the performance evaluation and detection of the shield tail brushes.

关 键 词：盾尾刷 动态压缩试验 油脂逃逸试验 贴合力 弹性系数 油脂逃逸压力 

分 类 号：TU43[建筑科学—岩土工程]