Simultaneous grouting test device and test method for shield construction

Abstract

The invention discloses a synchronous grouting test device for shield construction and a synchronous grouting test method for shield construction. A containing space is formed by means of end plates and a ring-shaped through hole, wherein the end plates are respectively and fixedly arranged at two ends of a simulation shield shell, and the ring-shaped through hole is formed along the axial direction of a simulation shield shell end wall; the containing space is vertically divided into a first slurry channel and a second slurry channel by means of a spacer plate; therefore, the cross sectionalarea of a channel for conveying slurry is greatly enlarged, the flow resistance of the slurry is greatly reduced, grouting is performed according to an actual slurry ratio in a test process, and the device and the method, which are provided by the invention, are more helpful to study of an influence mechanism of different grouting pressures and grouting amounts on tunnel duct piece structure stress and stratum deformation. Furthermore, a first slurry inlet and a second slurry inlet are respectively connected with a first grouting system and a second grouting system, and can respectively control the grouting pressures and the grouting amounts of the first slurry channel and the second slurry channel, so that the influence of the same and different grouting pressures and grouting amounts onthe deformation of tested soil in the first slurry channel and the second slurry channel can be studied.

Description

technical field [0001] The invention relates to the technical field of shield tunneling construction simulation tests, in particular to a shield tunnel construction synchronous grouting test device and a test method. Background technique [0002] During the shield construction process of the tunnel, as the shield machine continues to advance in the soil and assemble the segments, the soil will continue to form shield tail gaps because the outer diameter of the segments is smaller than the outer diameter of the shield shell of the shield machine. This requires synchronous grouting during the advancement of the shield machine to fill the formed voids in time, so as to prevent the surrounding strata from collapsing and deforming to a greater extent and causing damage to the surrounding surface buildings. In addition, the grout pressure generated during the synchronous grouting process will change the internal force distribution of the tunnel segment structure and increase the d...

AI Technical Summary

Problems solved by technology

But there are still deficiencies, the reasons are: 1, the grouting pipe is too thin and long, the flow resistance to the grout is very large, the actual grout ratio cannot be used for grouting, and the grouting amount of each grouting pipe cannot be effectively controlled at the same time and grouting pressure, will have a negative impact on the study of the impact mechanism

2. The influence of the grouting pressure and grouting amount of synchronous grouting on the force and deformation of the tunnel segment structure is not considered, for example, the influence of grouting pressure and grouting amount on the staggering and floating of tunnel segments

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