Safety guarantee method for underwater shield tunnel based on directional drilling-exploration-survey integration

Abstract

The invention discloses an underwater shield tunnel safety assurance method based on the integration of directional drilling-exploration-measurement. First, a small-diameter borehole is constructed under the water area, and an initial geological model is established; then, the small-diameter borehole is expanded. hole to form a large-diameter borehole, and then place the parallel electrical cable and monitoring optical cable in the large-diameter borehole. There is an inversion method to process the data to form an inversion image, and complete the refined geological model of the stratum; start the tunnel excavation, and obtain the disturbance of the rock and soil mass during the excavation process and the settlement of the rock and soil mass around the tunnel through parallel electrical cables and monitoring optical cables. The deformation of the tunnel can be completed to complete the safe excavation of the tunnel; during the subsequent use of the tunnel, parallel electrical cables and monitoring optical fibers are used to continuously monitor the tunnel and its surrounding rock and soil, and the settlement and deformation can be detected in time, thus ensuring the safety of the entire life cycle of the tunnel. Safety.

Description

technical field [0001] The invention relates to a safety guarantee method for an underwater shield tunnel, in particular to a safety guarantee method for an underwater shield tunnel based on the integration of directional drilling-exploration-measurement. Background technique [0002] Construction of tunnels and other underground projects under water poses great safety risks. The construction of underground projects such as tunnels generally requires geological exploration of the construction area in advance. Only by understanding the geological model can the safety and stability of subsequent development be guaranteed. At present, the main method is ground exploration, that is, placing exploration equipment on the ground above the tunnel excavation area. Then the exploration equipment conducts geological exploration on the required excavation area; although this method can effectively realize geological exploration, there are usually areas that are not suitable for ground e...

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Problems solved by technology

[0003] At present, the commonly used method is to excavate the rock and soil layer to a certain depth on the side of the water area, and then use the exploration equipment to carry out advanced detection of the rock and soil layer to be excavated below the water area to obtain its geological model. Even if the detection method of drilling in front of the shield machine is used, the detection range is small, and it can only be detected locally, and it is difficult to ensure the safety of the entire tunnel from a larger perspective

[0004] In addition, during the tunneling process, the stress of the surrounding rock and soil will change, resulting in changes in stability, and conventional geophysical exploration methods are difficult to continuously monitor during the tunneling process and the operation period after the completion of the tunneling, so that the full cycle cannot be achieved. Continuous monitoring; therefore, how to effectively explore the geological model under the water before the tunnel excavation, so as to guide the subsequent excavation period, and at the same time continue to conduct long-term monitoring of the rock and soil around the tunnel during and after the tunnel excavation process Monitoring, so as to provide data guidance for the whole life cycle, is the research direction of this industry

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