LU Dechun,DING Chao,LIN Qingtao,et al.Experimental Study on Three‑dimensional Effects of Shield Tunnel Excavation on Adjacent Pile[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):732-741.
LU Dechun,DING Chao,LIN Qingtao,et al.Experimental Study on Three‑dimensional Effects of Shield Tunnel Excavation on Adjacent Pile[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):732-741. DOI: 10.13409/j.cnki.jdpme.202002036.
Experimental Study on Three‑dimensional Effects of Shield Tunnel Excavation on Adjacent Pile
Taking the Qinghuayuan tunnel passing the piles of Beijing Metro Line 13 in a short distance as the engineering background, the three-dimensional disturbance characteristics of shield tunnel excavation in the pebble stratum to the adjacent piles is conducted by a model test. Five model piles (piles 1#~5#) were arranged in the test model. Taking pile 1# as an example, the influence of the excavation distance
D
on the three-dimensional disturbance law of the pile is studied. The test results indicate that the additional bending moment mainly occurs in the range of -0.5
D
to 0.0
D
; the maximum additional transverse bending moment is twice the maximum additional longitudinal bending moment; the additional axial force mainly occurs in the stage of -0.5
D
to 1.5
D
; the additional settlement on the pile top mainly occurs in the stage of -1
D
to 1
D
; and the additional load at the pile bottom continuously increases in the range of -0.5
D
to 2.0
D
. Test results of piles 1#, 2# and 3# show the influence of the horizontal distance between the pile and the tunnel on the disturbance of the pile. It can be found that the additional settlement, additional bending moment and additional axial force of the pile decrease as the horizontal distance between the pile and the tunnel increases, but the position of maximum bending moment moves up. Test results of piles 1#, 4# and 5# present the impact of the position of the pile bottom on the disturbance rule of the pile. Comparing the bending moments of piles 1#, 4# and 5#, it can be seen that the additional bending moment of the pile whose bottom is located at the tunnel crown with the same depth is the smallest.
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