Research On Application Of The Theory And Technique Of Geological Disaster Prevention And Treatment In Sub-sea Tunnel

The technique of geological prediction and geological disaster prevention and treatment plays a very important role in tunnel construction. Especially for some important construction, it is very important to prevent geological disaster with accurate geological prediction and corresponding preventing measures. However, every prediction method has its merits and weaknesses, and the predictions made by prospecting apparatus usually have more than one explanation, so present geological prediction methods cannot give us satisfactory results either in our country or abroad. Therefore, taking full advantage of geomechanics and accurately using TSP and further developing TSP functions are key content in the current tunnel geological disaster prediction work. And at the same time, only by synthetically putting geological prediction and corresponding preventing measures together, can we decrease to the maximum extent the investment and casualties of the project.There are two parts in this paper. The first part is the geological prediction based on Xiang'an sub-sea tunnel, the general idea and detailed procedure of the geological prediction are presented, then the synthetic geological prediction methods are put foreward based on the contrast between the predictive results and practical condition. Practice proves that combining geomechanic analysis with tunnel geological prediction can provide more scientific and reliable result. It can not only improve the precision of geological prediction and speed up tunneling progress, but also offers significant reference for future tunnel geological prediction.The second part is geological disaster preventing and treatment. Based on Xiang'an sub-sea tunnel, the measures to prevent collapse of the shallow area of the tunnel, to deal with fracture water, and to prevent collapse of the fault area and weathered area are discussed for geological disaster prevension. As for geological disaster treatment, based on some geological disasters of the Xiang'an sub-sea tunnel, the reasons of the geological disaster and the treatment measures are analyzed, which offers important reference for tunnel geological disaster preventing and treating in the future.