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Experimental study on mechanical behaviors of segmental joints with ductile-iron joint panels for deep-buried shield tunnels bearing high inner water pressure

Tunnelling and Underground Space Technology, ISSN: 0886-7798, Vol: 127, Page: 104590
2022
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The mechanical properties of high-stiffness segmental joints (HSSJs) in deep-buried drainage shield tunnels bearing high inner water pressure are different from those of segmental joints that do not face inner pressure; therefore, full-scale bending experiments for two kinds of HSSJs were conducted to reveal the mechanical behaviors of HSSJs under the action of inner water pressure and evaluate the joint type that is applicable for deep-buried drainage shield tunnels. The experimental results show that the joint opening grows and the rotational stiffness diminishes with the increasing inner water pressure, mainly due to the significant decrease of axial force at the joint position. With joint opening increases, local failure in the concrete around hand holes of HSSJs will occur. Moving the anchorage sections of the anchor bars in HSSJs behind the hand holes is an effective method to solve the local failure problem, which results in the improvement of anti-crack capacity of concrete in HSSJs, and also, the opening of HSSJs under the action of positive bending loading will decrease. For deep-buried shield tunnels bearing high inner water pressure, this structural adjustment could be considered if the crack development of concrete in HSSJs or the opening of HSSJs bearing a positive bending moment does not meet the tunnel design requirements.

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