Working condition simulation method of pressure type anchor model in centrifugal field

Abstract

The invention relates to a working condition simulation method of a pressure type anchor model in a centrifugal field. Anchors fixedly provided with fiber grating sensors and supporting body similar materials are arranged in a model box through auxiliary thin steel wires; after earth filling or pouring is carried out, the auxiliary thin steel wires are pulled away, and a foundation pit model is formed; prestress tension is carried out through a tension frame and weights, the compression plate of an excavation simulation device is used for carrying out compression on the excavation surface of the model, so that the anchors return to the state of zero prestress before tension is carried out; in a starting-up test, the compression plate goes backwards through a motor, then the anchors obtain prestress again, the compression plate is withdrawn according to different levels, and the simulation of the construction process of graded excavation and prestress application is achieved. The working condition simulation method of the pressure type anchor model in the centrifugal field is high in reliability and technicality and low in cost; the apparatus is simple, and the simulation of the pressure type anchors in a centrifugal model test is achieved; and practicability is high, and the construction process that excavation and prestress application are carried out without shutting down a machine can be well simulated.

Description

technical field [0001] The invention relates to the technical field of simulation of a pressure-type bolt applied to centrifugal model tests, in particular to the whole construction method of simulating grading excavation and grading prestressing in a centrifugal field. Background technique [0002] Conditional centrifugal model test has been widely used in the study of mechanical behavior and failure mechanism of foundation pit engineering because it has the same boundary and stress advantages as the prototype. The pressure type bolt has been used more and more in foundation pit engineering because of its pull-out ability in the case of urban land resources and space becoming more and more scarce. Due to the small size of the centrifugal model and the complexity of the centrifugal test, it is still impossible to simulate the pressure anchor in the centrifugal model; the accurate tension of the prestress is also the key to the success or failure of the centrifugal model test...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for simulating the working conditions of a pressure-type bolt model in a centrifugal field to solve the problems of pressure-type bolt simulation and accurate prestress tension in the centrifugal model, and to realize its classification in the centrifugal field Simulation of the whole construction process of excavation and staged prestressing

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