| Submarine Tunnel has yielded typically attentions in the field of transportation and particularly become the optimized selection in cross-sea transportation relying on its advantages in construction conditions such as hydrogeology and shipping, etc, with the mushroom growing of national economy and rapid development of cross-sea transport technology.Comparing with mountain tunnel, submarine tunnel is influenced specially by environment and has greater risks and challenges in the process of design and construction, particularly, when the coupling issues of interaction between seepage field and displacement field are considered. Therefore, a considerable amount of researches is needed at present. On the basis of the submarine tunnel between Qingdao and Jiaozhou bay, this essay illustrated the issues of surrounding rock’s seepage and change regularities, as well as the impacts of covering rock’s thickness in the undersea tunnel construction process from the aspects of analyzing method, model test approach and numerical method etc. The focus of this paper was on the following parts:(1) According to the characteristics of undersea tunnel, the mathematical model of seepage distribution under the influence of fluid-solid coupling was established. Moreover, it analyzed the distribution and change disciplines of surrounding rock seepage field and then compared the numerical results with the model test results. What’s more, the seepage rule of surrounding rock during the tunnel’s construction was achieved in the study.(2) Concentrating on the submarine tunnel between Qingdao and Jiaozhou bay, the partial evolution law of displacement field under the conditions of specific surrounding rock was investigated and also the calculation formula of displacement complete curve was deduced.(3) The research in this dissertation developed the new fluid-solid coupling similar materials, and made the model test bench. In addition it developed hydraulic loading system and seepage flowing collection device. Subsequently, the fluid-solid coupling model test study was available to be carried out by taking the undersea tunnel between Qingdao and Jiaozhou bay as a prototype. The results in the test played a better directive role in the research and analysis of surrounding rock seepage rule and deformation law.(4) Utilizing a multiphysics coupling software-Comsol, the essay conducted numerical simulations which systematically analyzed the influence laws and water inflow situations of surrounding rock seepage field, displacement field and stress field with different water depth and rock’s covering thickness.(5) Predicting tunnel seepage volume with three methods—theoretiealanalysis, empirieal formulae and numerieal simulation. |
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