Underwater shield tunnel safety guarantee method based on directional drilling-probing-measuring integration

Abstract

The invention discloses an underwater shield tunnel safety guarantee method based on directional drilling-exploration-measurement integration. The method comprises the following steps that: a small-diameter drill hole is constructed below a water area, and an initial geologic model is established; a small-diameter drill hole is drilled, then the small-diameter drill hole is expanded to form a large-diameter drill hole, then a parallel electrical method cable and a monitoring optical cable are placed in the large-diameter drill hole, before tunneling, data of a zero-order field, a primary field and a secondary field are obtained through a carbon rod measuring electrode, and an existing inversion method is used for processing the data to form an inversion image; a stratum refined geologic model is completed; tunneling is started, the disturbance condition of a rock-soil body in the tunneling process and the settlement deformation condition of the rock-soil body around a tunnel are obtained through the parallel electrical method cable and the monitoring optical cable, and safe tunneling of the tunnel is completed; and in the subsequent use process of the tunnel, the parallel electrical method cable and the monitoring optical fiber continuously monitor the tunnel and the surrounding rock-soil body, the settlement deformation condition can be found in time, and therefore the safety of the whole life cycle of the tunnel is guaranteed.

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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