Testing method and device for multiple-stratum deformation induced by shield tunnel excavation

Abstract

The invention discloses a testing method and device for multiple-stratum deformation induced by shield tunnel excavation. The testing device comprises a centrifugal mechanism and a model mechanism, wherein the centrifugal mechanism and the model mechanism are connected. The model mechanism comprises a model box and a tunnel model, wherein the tunnel model is arranged in the model box. The testingmethod comprises the following steps that (1), the tunnel model is arranged on a supporting plate of the model box, and the tunnel model is fully filled with water; (2), lower layer sandy soil, middlelayer powder soil and upper layer clay are put into the model box, and water is added; (3), the upper layer clay in the model box is solidified through the centrifugal mechanism; (4), cameras are installed in observation holes; and infrared monitoring equipment is arranged on the outer side of an organic glass plate; (5), water in the tunnel model is extracted out through a conical hole; and (6),testing results of clay-powder soil-sandy soil layer sedimentation deformation induced by shield tunnel excavation can be obtained by collecting monitoring data of the cameras and the infrared monitoring equipment.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a test device and a test method for multi-layer formation deformation induced by shield tunnel excavation. Background technique [0002] Since the reform and opening up, with the vigorous development of the national economy, China's urbanization process has been accelerating, and the construction of urban tunnels and underground projects has also developed rapidly [1]. Since urban shallow tunnels are located in areas with intensive human activities, the excavation path often penetrates the Quaternary soil layer, and the excavation construction often brings very adverse effects to the existing buildings on the ground, railway tracks and underground pipelines, causing serious damage. economic losses and adverse social impacts. In order to qualitatively and quantitatively evaluate the impact of soil settlement and deformation caused by tunnel excavation on surface buildings,...

AI Technical Summary

Problems solved by technology

The basic principle of the geotechnical centrifugal model experiment is to place the model made of raw materials according to a certain scale in the high centrifugal field generated by the high-speed rotating centrifuge, and increase the self-weight force of the model soil to make the stress of the model The state reaches the same stress state level as the prototype, and shows a deformation and failure process similar to the original model, which can truly simulate the behavior of rock and soil structures with self-weight as the main load; however, so far, there is no experimental device or The experimental scheme can be used to study the excavation problem of shield tunneling in multi-layer soils such as clay-silt-sand and so on, which can truly simulate the self-weight as the main load

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