Dissociated type model test device and method for simulating shield tunnel excavation grouting construction

Abstract

The invention discloses a dissociated type model test device and method for simulating shield tunnel excavation grouting construction, and belongs to the technical field of underground engineering model test. The dissociated type model test device comprises a model box used for filling with a soil body, wherein circular holes are separately formed in two side walls of the model box; a solid cylinder, two ends of which are separately in lap joint on the circular holes, is arranged in the model box; an insertion side workbench is arranged at one side of the model box; a dissociated side workbench is arranged at the other side of the model box; a hollow tunnel circular tube which penetrates into a simulating box from the circular hole in one side of the model box is arranged on the insertion side workbench; a rubber ring sleeve, the inner side surface of which is bonded with the hollow tunnel circular tube, sleeves the hollow tunnel circular tube; a grouting tube is arranged in the hollow tunnel circular tube; one end of the grouting tube penetrates through the side wall of the hollow tunnel circular tube and is connected with the rubber ring sleeve; and the other end of the grouting tube is connected with a hydraulic control system. The dissociated type model test device can simulate disturbance, on surrounding soil body, of shield tunnel excavation, and also can simulate a shield tail grouting process during shield excavation construction.

Description

technical field [0001] The invention relates to a detachable model test device and method for simulating excavation and grouting construction of a shield tunnel, belonging to the technical field of underground engineering model tests. Background technique [0002] With the rapid development of my country's national economy, the urbanization process is accelerating. In order to ease the ground traffic, many cities are gradually entering the high-speed period of subway construction. The shield tunneling method is a commonly used method in the construction of subway tunnels, and the influence of shield excavation on the deformation of the ground and surrounding buildings has attracted increasing attention. [0003] Through the experimental method to study the poor surrounding environment caused by the construction of shield tunnels, more intuitive observation results can be obtained. The in-situ test is limited to the influence of factors such as large heterogeneity of the grou...

AI Technical Summary

Problems solved by technology

[0004] At present, some model test methods have been used to simulate the impact of shield tunnel excavation on strata and buildings, such as using rotary drilling machinery to simulate shield excavation. The whole circular tube is used to follow up the simulated lining, so that the grouting of the tail of the shield cannot be carried out, and if the relevant model test is carried out with a small shield machine, the cost is too expensive

In terms of shield tail grouting, the existing model test methods mostly use pre-embedded double-layer casing, and the tail grouting is performed during the pulling out of the outer casing. This method is difficult to accurately simulate the disturbance of the ground during the shield excavation process.

Images