Complete earth pressure balance shield construction soil mass improvement test method

Abstract

The present invention discloses a complete earth pressure balance shield construction soil mass improvement test method, and belongs to the technical field of the tunnel construction. According to the present invention, a set of test methods for evaluating commonly-used additives in the shield construction and performances of the improved soil mass are designed; a foam test and a mud test are adopted to prepare and evaluate the performances of the additives; a slump test, a stirring test, a friction test, and an earth pressure tank model test are adopted to evaluate the performances of the improved soil mass, and study the fluidity, the vicidity, the friction performance, the permeability and the force transmission performance of the improved soil mass, determine the performance evaluation standard of the improved soil mass, and provide an additive proportion optimizing scheme for the earth pressure balance shield construction. With the set of the test methods and the process, the performances of the additives and the improved soil mass can be comprehensively evaluated; the test scheme is scientific and reasonable; the applicable soil mass of the test method has wide types; the test effect is significant; the test method and the evaluation standard are provided for effectively and economically adopting the additives for improving the soil mass in the earth pressure balance shield construction in different stratums.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a set of standard test methods for evaluating the properties of additives and improved soil, determining the evaluation standard for improved soil, and optimizing the proportioning scheme of additives for earth pressure balance shield tunneling construction. Background technique [0002] The basic principle of the earth pressure balance shield tunneling method is: the soil chamber is filled with the soil with good plastic flow state excavated by the cutter head, and the soil pressure in the soil chamber is controlled by the advancing speed of the shield machine and the soil discharge speed of the screw earthmover to balance The soil pressure and water pressure of the tunnel face ensure the stability of the tunnel face during the excavation process and realize the smooth construction of the shield. However, due to the difference in stratum conditions, the s...

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Problems solved by technology

In addition, the design of the shield machine model is generally relatively simple. It mainly studies the stability of the face during the construction of the shield and the soil deformation and stress change characteristics after the tunnel is formed. There are few studies on the performance of the soil inside the shield machine. In particular, there are few studies on the pressure distribution and pressure transfer laws of the soil in the soil chamber.

The above tests are only some tests conducted by individual construction sites or laboratories. For the earth pressure balance shield construction industry, there is no complete set of test methods, and there is also a lack of corresponding evaluation standards. Determined by engineering experience, there is blindness in construction

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