In this study, considering the natural stratification
of the stratum, an analytical solution for the longitudinal displacement of a
shield tunnel associated with an overcrossing tunneling in layered soils is
proposed. The proposed solution can accurately predict the heave of the
existing shield tunnel due to the overcrossing tunneling. First, the
interaction between the shield tunnel and surrounding soil is analyzed and the
overall coupling equilibrium equation between them is established. Second,
based on Mindlin′s solution, the uplift displacement of the underlying layered soils
due to unloading pressure induced by the excavation of a new tunnel is
obtained. Moreover, the longitudinal displacement of the shield tunnel is
obtained by combining with the overall coupling equilibrium equation. Finally,
the results obtained using the proposed method are compared with the
measurement data from three overcrossing projects, and the related parameters
are analyzed. The results indicate the following: (1) Previous prediction
methods based on elastic foundation beams and the proposed method
satisfactorily predict the tunnel heave in the case of minimal stratification
of the ground beneath the existing tunnel. (2) The predicted results from the
proposed method concur with the measurements in the case of remarkable
stratification of the ground. (3) Increasing the tunnel diameter will increase
the uplift displacement and widen the range of the tunnel heave. (4) Reducing
the clearance between the new tunnel and the existing tunnel increases the
tunnel heave. (5) When the existing tunnel is located on the upper soft and
lower hard strata, its uplift range is smaller but its uplift magnitude is
greater than that of the upper hard and lower soft strata.
YU Dongdong
,
LI Zhongchao
,
LIANG Rongzhu
,
ZHANG Zhiwei
,
MEI Jiaoxin
,
XIAO Mingzhao
,
WU Wenbing
,
GAO Kun
. Coupling Analysis of Longitudinal Deformation of
Shield Tunnel Caused by Overcrossing Tunneling in Layered Soils[J]. Tunnel Construction, 2023
, 43(5)
: 804
-815
.
DOI: 10.3973/j.issn.2096-4498.2023.05.008
