高水压超大直径盾构法公路隧道管片接缝变形研究

Research on Deformation of Segment Lining Joint of Highway Tunnel with High Water Pressure and Super-large Diameter Shield Method

依托江阴靖江长江隧道工程,结合整环原型试验和三维精细化数值模拟,研究了水土压对超大直径通缝管片接缝变形的影响规律。结果表明:当封顶块位于拱顶时,管片接缝的最大变形、最大张开量分别位于拱顶外侧与内侧接缝;管片外侧接缝变形随水压增大而增大,而管片内侧接缝闭合速度随水压增大而减小;随着土压的逐渐增大,管片内侧接缝始终先于外侧接缝张开;当土压与水压之比小于0.5时,拱顶和拱底内侧接缝始终处于张开状态;当土压与水压之比大于3时,拱肩和拱脚外侧接缝始终处于张开状态;当两者的比值大于4时,拱腰外侧接缝始终处于张开状态。

Based on the Jiangyin Jingjiang Yangtze River Tunnel Project,combined with the whole ring prototype test and three-dimensional refined numerical simulation,the deformation law of water and soil pressure on the joints of super-large diameter through-seam segments are explored in the paper.The results show that when the capping block is located at the vault,the maximum deformation and maximum opening of the segment joint are located at the outer and inner joints of the vault,respectively;the deformation of the outer joint of the segment increases with the increase of water pressure,while the closure speed of the inner joint of the segment decreases with the increase of water pressure;with the gradual increase of earth pressure,the inner joint of the segment is always opened before the outer joint;when the ratio of earth pressure to water pressure is less than 0.5,the inner joint of vault and arch bottom is always in an open state;when the ratio of earth pressure to water pressure is greater than 3,the outer joint of arch shoulder and arch foot is always open;when the ratio of the two is greater than 4,the lateral joint of the arch waist is always in an open state.