Analysis of Stratigraphic Subsidence Caused by Sand Leakage in Tunnel Lining

Wang, Zhongchang; Qu, Tong; Li, Bo; Wang, Aoxiang

doi:10.1007/s10706-020-01604-y

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…Aiming at the problem of soil deformation caused by tunnel excavation in the strata containing cavities, the existing research methods chiefly include numerical simulation [2,[4][5][6], model test [3,7,8], and theoretical calculation [9][10][11][12]. The contents of the research have largely focused on the failure mechanism of surface collapse caused by the development of cavity deformation [5,6,[13][14][15], the influence of the existence of cavities on the stress on and the failure mode of tunnel segments [2,3,16], the law of the surface settlement under the combined influence of cavities and tunnel excavation [4,7,8,[10][11][12], and the change law of the stress field in the formation with cavities [9,17]. Among them, Cai et al [4] and Zhang et al [7] have generally used model tests and numerical simulation.…”

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confidence: 99%

A Method for Calculating Soil Deformation Induced by Shielded Tunneling in Ground Stratum with Cavities

Cui

Dai

et al. 2021

Symmetry

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The existence of cavities in shallow ground strata is one of the important causes of urban road collapse under the disturbance of tunnel excavation. Thus, this paper discusses the convergent deformation mode of ellipsoidal cavities. To this end, the convergent deformation of a cavity and the overall displacement of a tunnel were comprehensively examined. A three-dimensional symmetrical calculation model of the soil deformation under the combined action of the tunnel and the cavity was also established. Moreover, three-dimensional formulas for calculating the soil deformation and the surface settlement of the upper part of the tunnel and the cavity were derived. The influence of the different positions of the cavity on the surface settlement of the upper part of the tunnel was also examined. Further, the change in the soil settlement with the direction of the tunnel excavation and the depth of burial of the cavity was analyzed. The results show that the calculated settlement curves are consistent with the ones reported in the related literature. The cavity can also aggravate the surface settlement and deformation of the soil caused by the tunnel excavation. When the cavity is directly above the tunnel, the surface settlement curve is symmetrically distributed. As the position of the cavity changes, the overall settlement curve shifts to the direction of the cavity, showing asymmetry. Additionally, along the x-axis direction of the shielded tunnel, the surface settlement gradually increases to a limit value with a decrease in x and slowly declines to zero as x rises. Finally, along the depth of burial of the cavity, the settlement of the soil continues to enlarge; also, the growth rate of the soil settlement continues to increase further at positions closer to the cavity and the tunnel until it reaches a critical maximum.

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