Testing apparatus and testing method for simulating improvement of residue earth during earth pressure balance shield construction

Abstract

The invention discloses a testing apparatus and a testing method for simulating improvement of residue earth during earth pressure balance shield construction. The testing apparatus comprises a compression system, a testing earth bin, a cutter head system, a cutter head driving system and a spiral earth discharge machine. The testing method includes compressing the inside of a mud tank by an air compressor and pushing mud in the mud tank into elastic liquid bags; applying pressures on earth by the aid of the high-pressure mud and simulating trapezoidal load on actual engineering cutter heads. The testing apparatus and the testing method have the advantages that residue earth cutting procedures of the shield cutter heads are realistically simulated, pressure environments which are consistent with pressure environments during actual engineering can be formed in shield earth bins, and accordingly the simulation reliability can be guaranteed to the greatest extent; the pressures on earth in the shield earth bins are monitored, and accordingly influence of the internal pressures of the bins on the soil discharge efficiency can be researched; change of pressures along the spiral earth discharge machine and the magnitude of torque of a spiral shaft are monitored, and accordingly earth improvement effects can be 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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