Experimental Study on Consolidation and Hardening of Mud Cake of Shield Cutterhead in Cohesive Stratum

  • Wang Yubo ,
  • Zhou Kaige ,
  • Fang Yong ,
  • Liu Sijin ,
  • Ma Yuyang
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  • 1. Key Laboratory of Transportation Tunnel Engineering, Southwest Jiaotong University, Chengdu 610031, P.R. China;
    2. China Railway 14th Bureau Group Shield Engineering Co., Ltd., Nanjing 210031, P.R. China

Received date: 2023-12-19

  Online published: 2024-09-04

Abstract

The cutterhead is prone to mud cake problems when the shield is tunneling in the cohesive stratum. In severe cases, the cutterhead is blocked to reduce the shield tunneling efficiency and affect construction safety.During the process of the slag adhering to the cutter head, it is accompanied by the solidation and hardening of the mud cake. To find out the influencing factors of consolidation and hardening of mud cake in shield cutterhead, laboratory tests are carried out by using a self-made cutter head tunneling simulation device. The relationship between soil properties, temperature, cutterhead earth pressure, and consolidation and hardening characteristics of mud cake is studied. The experiment of soil conditioning is carried out to explore the influence of different soil conditioners on the degree of consolidation and hardening of mud cake. The results show that the water content and cone penetration depth of mud cake can characterize the consolidation and hardening characteristics of mud cake. The properties of the soil have the greatest influence on the degree of consolidation and hardening of the mud cake formed by the cutterhead after excavation, followed by the temperature, and the cutterhead earth pressure has stratigraphic differences on the degree of consolidation and hardening of the mud cake. The foam agent has an obvious effect on the consolidation and hardening of pure clay and sand-containing clay cake, while the dispersant only has an obvious effect on pure clay.

Cite this article

Wang Yubo , Zhou Kaige , Fang Yong , Liu Sijin , Ma Yuyang . Experimental Study on Consolidation and Hardening of Mud Cake of Shield Cutterhead in Cohesive Stratum[J]. Chinese Journal of Underground Space and Engineering, 2024 , 20(4) : 1169 -1179 . DOI: 10.20174/j.JUSE.2024.04.12

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