Test method for water leakage of shield segment joints

Abstract

The invention relates to a shield segment joint water leakage test method. The method comprises steps of (1), making a water inlet pipe; (2), cutting a segment; (3), making a hollow square groove; (4), making a hollow square sealing pad; (5), coating waterproof glue on a groove surface; (6), assembling the segment, and accomplishing model making; (7), automatically controlling selection of permeameters; (8), loading; (9), utilizing a variable head method or a fixed head method to carry out a tunnel water leakage test; and (10), changing a loading grade, repeating the steps (8) and (9), and acquiring joint force bearing-splaying amount-water leakage relationships. The method is advantaged in that the hollow square groove is made at a segment joint, the variable head method or the fixed head method is utilized to carry out the shield tunnel joint water leakage test, a technical problem in utilizing the shield segment to carry out the tunnel water leakage test is solved, relationships between segment water leakage and influence factors are more accurately reflected, moreover, segment force bearing-joint water leakage, joint splaying amount- joint water leakage relationship curves can be acquired.

Description

technical field [0001] The invention belongs to the field of model test of shield tunnel segment joints. Background technique [0002] The shield tunnel with prefabricated lining has a large number of joints. These criss-cross joints affect the integrity of the tunnel structure and cause many durability problems in the tunnel structure. Among them, the water leakage problem of segment joints is the focus and difficulty of shield tunnel disease prevention and control. The water leakage test of segment joints is the most effective and direct method to study the anti-seepage performance of structures and explore the water leakage mechanism of joints. [0003] The existing water leakage test of segment joints can be roughly divided into two types according to the materials and loading methods used in the model test: (1) stainless steel plate is used to simulate the joint concrete, and the loading is carried out by controlling the bolt stress; (2) two A concrete block was used ...

AI Technical Summary

Problems solved by technology

The invention adopts the standard block of the segment and the special back-type sealing gasket groove to carry out the water leakage test of the segment joint, solves the problem of using the concrete segment to carry out the joint leakage test, and truly reflects the back-type sealing gasket and material The contact characteristics between them can comprehensively consider the relationship between bolt pretightening force, joint opening, structural force and leakage water

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