Abstract
Compared with ordinary tunnels, the influence analysis of underwater tunnel adjacent constructions is more complicated. At present, the empirical method used to divide the influence zone of the tunnel adjacent constructions has great uncertainty. So it is of great significance for actual construction and design to determine the influence zone accurately according to theoretical calculations. In this paper, based on the Hoek–Brown nonlinear failure criterion of rock mass and taking seepage factor into account, the stress state of rock mass around the underwater tunnel adjacent constructions can be deduced by elastoplastic theory. Then combined with the concept of “loose zone-bearing zone”, the influence zone division method of underwater tunnel adjacent constructions is proposed, and it is applied to the analysis of engineering examples. Through the deduced theoretical formulas, the influence zone of underwater tunnel adjacent construction can be divided into extensively strong, strong, relatively strong, weak, and noninfluence zones. Corresponding the influence zones with the risk levels in the code, different control measures are adopted for different risk levels, which can provide certain guidance for the design and construction of tunnel in practical engineering.
Highlights
The development of urban subway traffic construction is rapid
As the utilization ratio of land resources and building space in the city is gradually improved, tunnel construction inevitably will be close to existing structures, which makes tunnel adjacent construction become the key link in current tunnel design and construction, and underwater tunnel is no exception
The plastic zone was regarded to strong influence zone, and the field test and the finite element method were used to verify this finding
Summary
The development of urban subway traffic construction is rapid. As the utilization ratio of land resources and building space in the city is gradually improved, tunnel construction inevitably will be close to existing structures, which makes tunnel adjacent construction become the key link in current tunnel design and construction, and underwater tunnel is no exception. In works [15, 16], different numerical simulation methods were used to evaluate the influence zone of the adjacent construction. Zhang et al [22] used a viscoelastoplastic model (VEP model) to simulate the rheologic deformation of soil and studied the behavior of the tunnel underneath excavation by the new method to discuss the influence of different factors, including excavation area, relative distance, and construction procedure. Summarizing previous studies, it is found that the current research on the influence zone of tunnel adjacent construction is rarely about the underwater tunnel. In this study, based on the HoekBrown yield criterion, considering the influence of water seepage, the elastoplastic analysis of the underwater tunnel construction is carried out, and the method of zoning of the underwater tunnel adjacent construction is further proposed. Corresponding the influence zones with the risk levels in the code, the appropriate control measures are selected on the basis of the risk level to guide the site construction
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