Simulation test method and system of large-diameter soil pressure shield tunnel driving interface

Abstract

The invention discloses a simulation test method and system of a large-diameter soil pressure shield tunnel driving interface. The system comprises a model box, a shield model, a shield driving system, a water level control device, a seepage tracking device and a monitoring system. A water level control system sends water to different heights of the model box to simulate the underground water level; the seepage tracking device tracks the seepage streamline distribution at the location by the diffusion of a pigment under the action of seepage; and the monitoring system comprises a digital camera, and an earth and water pressure sensor for monitoring the soil deformation, soil warehouse pressure distribution and the fluctuation law of the driving interface. According to the simulation test method and system disclosed by the invention, a large-diameter soil pressure shield driving process is simulated by propelling a soil warehouse partition plate and transporting muck, different water level heights and driving speeds are set, the soil deformation, soil warehouse pressure distribution and the fluctuation law are monitored to study the underground water seepage rule and instability characteristics of the large-diameter shield driving interface in permeable formation, and effective early warning is performed on the instability of the driving interface, and then a corresponding instability mechanism is established.

Description

technical field [0001] The invention relates to a simulation test method and system for a tunnel excavation interface, in particular to a simulation test method and system for a large diameter earth pressure shield tunnel excavation surface. Background technique [0002] At present, the earth pressure shield construction is developing in the direction of large diameter and large buried depth. In the actual excavation process, under the influence of factors such as the rotation of the cutter head, excavation, shield advancement, and injection of lubricant and foaming agent, the pressure of the soil bin often fluctuates continuously. With the increase of the diameter of the earth pressure shield, the pressure difference at different heights in the soil bin becomes more pronounced. Under the disturbance of the excavation, it is easy to form an obvious low pressure area in the middle and upper part of the soil bin, which leads to insufficient support load in local areas, and str...

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Problems solved by technology

The model test was carried out under dry sand conditions. It mainly measured the surface settlement deformation and the change law of the axial force of the excavation surface under different advanced reinforcement forms. It did not involve the influence of seepage on the stability of the excavation surface. It is quite different from the actual excavation behavior of shield tunneling, and it cannot reflect the characteristics of pressure fluctuation in the soil chamber of large-diameter shield tunneling construction

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