Method for determining support pressure on excavation face of slurry shield tunnel

Abstract

The invention relates to a method for determining a reasonable range of support pressure on a construction excavation face of a slurry shield tunnel. A method with combination of experimental testing, analog computation of numerical values and theoretical judgment is adopted; and the method disclosed by the invention comprises the following steps of sampling a field tunnel construction soil body, testing the performances of the soil body, establishing an analytical model of the construction excavation face of the slurry shield tunnel, which is in line with field construction conditions according to experimental data and specific actual situations of the tunnel, performing computation, judging the destruction situation of a soil body unit in front of the excavation face by determining lateral soil pressure of an excavation stratum of a tunnel construction section, central balance pressure of the excavation face and main stress of the soil body in front of the excavation face and combining with a molar-coulomb failure criterion of the soil body and finally determining the reasonable range of the support pressure on the construction excavation face of the slurry shield tunnel. According to the method disclosed by the invention, the reasonable range of the support pressure on the excavation face can be analyzed and determined in a real-time manner according to different construction conditions and states while the construction of the tunnel is promoted, and the method further has the characteristics of a wide range of applications, high reliability and convenience in application.

Description

technical field [0001] The invention belongs to the field of shield tunnel engineering construction, in particular to a method for determining the excavation face support pressure of a mud-water shield tunnel, which can determine a reasonable range of the mud-water shield tunnel excavation face support pressure. Background technique [0002] In tunnel engineering, the shield tunneling method has shown great advantages because it is not affected by the interference of external factors such as seasons and weather conditions, and has the characteristics of fast construction speed, fewer construction personnel, and high construction precision. In particular, the mud-water balance shield construction is suitable for various complex geological environments, and has been widely used in the construction of large and medium-sized tunnels in the world, especially in the tunnel construction of urban underground projects. [0003] During the construction of slurry shield, underground co...

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Problems solved by technology

[0005] At present, the method of determining the support pressure of the excavation surface of the mud-water shield is mainly to use empirical formulas for simple calculation. This method has a weak theoretical foundation, and it is impossible to accurately determine the support pressure of the excavation surface, and it cannot guarantee construction safety.

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