Super-large shield section frozen soil body temperature characteristic optimization method based on Gaussian process machine learning and device thereof

Abstract

The invention discloses a super-large shield section frozen soil body temperature characteristic optimization method based on Gaussian process machine learning, and the method comprises the following steps: S1, carrying out the fitting of a temperature function of a reinforced soil body through the Gaussian process machine learning, and obtaining a function rule of the temperature; and S2, performing particle swarm intelligent optimization on the obtained implicit function, and obtaining the frozen surface of the frozen body. The invention also discloses a super-large shield section frozen soil body temperature characteristic optimization device based on Gaussian process machine learning, and the device comprises a temperature function fitting module which carries out the fitting of a temperature function of a reinforced soil body through the Gaussian process machine learning, and obtains a function rule of the temperature; and a frozen body function fitting module which is used for carrying out particle swarm intelligent optimization on the obtained implicit function and obtaining a frozen surface of the frozen body. The method can be widely applied to the technical field of tunnels and underground engineering by effectively controlling the time length of positive freezing, intelligently optimizing freezing, reducing resource waste and enhancing environmental protection.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a method and device for optimizing the temperature characteristics of frozen soil with a super-large shield section based on Gaussian process machine learning. Background technique [0002] The freezing method is a method that uses artificial refrigeration to temporarily freeze the reinforced formation and cut off the effect of groundwater. At present, the freezing method is mostly used in the origination and reception of shield tunneling wells, especially when there is a permeable layer on the shield tunneling surface Time. The freezing method construction can effectively cut off the starting and receiving portals and the soil of the permeable layer, and can better ensure that the shield tunneling wells will have water gushing and soil gushing caused by the pressurized water carried by the permeable layer at the tunnel opening when the shield tunnelin...

AI Technical Summary

Problems solved by technology

[0004] see figure 1 , the freezing reinforcement of the existing shield working wells is often determined according to the specifications, and at the same time, the reinforcement is frozen. The freezing requires that the active freezing temperature is generally -28°C, and the temperature of the freezing body is generally -8°C to -10°C, and it needs to be maintained. Freezing prevents the temperature from being lost due to the influence of the external temperature, which affects the effective thickness of the frozen body

In order to meet the safety of the starting of the sea-crossing tunnel, it is required that the active freezing should be carried out continuously under the condition of satisfying the effective thickness of the frozen body until the starting of the shield tunnel ends. This method will cause unnecessary waste of resources, and the water flow of the seaside environment Strong, when the characteristics of temperature attenuation cannot be judged, it is necessary to use a large amount of refrigerant to maintain the effective thickness of the frozen body

[0005] In the past, the design and construction of the freezing method were relatively extensive, and this method could not effectively control its adverse impact on the surrounding environment. The extensive design and construction often had the characteristics of poor economy and poor feasibility. Take the shield tunnel as an example. The horizontal freezing design requires a width of 3m and two rows of freezing pipes. However, there is a row of freezing pipes located in the shield excavation surface, which needs to be pulled out when the tunnel is broken. Fast, there is no guarantee that the 3m width of the frozen body can meet the requirements when the shield starts, and it will cause too much waste of resources

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