A test device and method for simulating earth pressure balance shield construction dregs improvement

Abstract

The invention discloses a test device and method for simulating soil improvement in earth pressure balance shield construction, including a pressurization system, a test soil bin, a cutter head system, a cutter head drive system and a screw excavator; The air compressor pressurizes the mud tank, and the mud in the tank is pressed into the elastic liquid bag; the pressure is applied to the soil through the high-pressure mud, which can simulate the trapezoidal load on the actual engineering cutter head. Through the real simulation of the process of cutting the muck by the shield cutter head, a pressure environment consistent with the actual project is formed in the shield soil chamber to ensure the reliability of the simulation to the greatest extent. By monitoring the earth pressure in the soil chamber of the shield machine, the influence of the pressure in the chamber on the excavation efficiency is studied; by monitoring the pressure change along the screw excavator and the torque of the screw shaft, the effect of soil improvement is comprehensively evaluated.

Description

technical field [0001] The invention relates to a test device and method for simulating soil improvement of earth pressure balance shield construction dregs. The device can simulate the shield tunneling construction process, is suitable for the muck improvement test in the field of tunnel and underground engineering technology, and belongs to a model test device for simulating tunnel construction. Background technique [0002] The earth pressure balance shield is a special machine used for underground engineering construction. Due to its relatively low cost, high excavation efficiency, strong stratum adaptability, and small impact on the surrounding environment, it is widely used in various tunnel constructions in my country. have been widely used. Especially in recent years, the economic development of various provinces and cities, the planning of provincial capitals and first-tier cities, and the increasing number of subway projects under construction have effectively prom...

AI Technical Summary

Problems solved by technology

The existing shield dreg improvement model test device can realize the pressurization in the shield chamber and the excavation of the screw excavator, but it is difficult to simulate the "weak underpressure" pressure state in the soil chamber in actual engineering because of the pressure from the top; and Due to the pressure on the top, the soil is consolidated, and the mixing is difficult. The screw shaft in the soil bin is bent due to the vertical force, resulting in unsatisfactory test results.

Most of the other improvement tests use manual mixing of the muck, and the basic experiment is used to analyze the fluidity of the improved muck, which is quite different from the state of the muck in the soil bin in the actual project.

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