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.

承受高内水压力的深埋排水盾构隧道高刚度节段节点（HSSJs）的力学性能与不面临内压的节段节点不同；因此，对两种HSSJs进行了全尺寸弯曲试验，以揭示HSSJs在内部水压作用下的力学行为，并评估适用于深埋排水盾构隧道的接头类型。实验结果表明，随着内部水压的增加，接头开口增大，转动刚度减小，这主要是由于接头位置处的轴向力显着减小。随着接头开口的增加，HSSJs手孔周围的混凝土会发生局部破坏。将HSSJ中的锚杆的锚固段移到手孔后面是解决局部破坏问题的有效方法，从而提高了HSSJ中混凝土的抗裂能力，并在作用下HSSJs张开。正弯曲载荷将减少。对于内水压力较高的深埋盾构隧道，当高速钢混凝土裂缝发展或正弯矩高速钢隧道开孔不符合隧道设计要求时，可考虑进行结构调整。