Miniature pre-stress anchor wire used for model experiment and its burying and loading method

Abstract

The invention relates to a miniature pre-stress anchor cable used in a model experiment, which comprises an adjusting bolt and a steel stranded wire, wherein a nut of the adjusting bolt is fixed on the side wall of a cavity, the bolt is screwed into the nut to serve as an anchor cable head jointly, the steel stranded wire penetrates through the bolt, and is fixed on the bolt head through a slice, and the other end of the steel stranded wire is connected with a spring arranged in the inner anchor section in the model. The invention also discloses a burying and loading method for the miniature pre-stress anchor cable. The invention has the following advantages: firstly, through changing the lengths of the steel stranded wire and the spring, the size of the model pre-stress anchor cable can be adjusted at will so as to satisfy the model experiment similarity ratio requirements; secondly, through choosing the spring stiffness, the pre-stress scope of the model pre-stress anchor cable can be controlled so as to satisfy the model experiment requirements; thirdly, the pre-stress of the model anchor cable can be adjusted and controlled conveniently and accurately, and the miniature pre-stress anchor cable can be used under severer working conditions; and fourthly, the miniature pre-stress anchor cable can be applied in the rock geomechanics model test and research in the project fields of water conservancy, traffic, energy resources, mines, and the like.

Description

technical field [0001] The invention relates to a support anchor for geomechanical model tests of underground engineering such as tunnels, subways, and underground powerhouses, in particular to a miniature prestressed anchor cable for geomechanical model tests of underground engineering and its embedding and loading method . Background technique [0002] The model test based on the similarity theory originated in the 17th century. After several centuries of development and improvement, it has achieved unprecedented development and wide application in the 1970s. Its application fields involve almost all disciplines of scientific research. The model test of underground caverns started at this period, mainly because the scale of some underground caverns in transportation, hydropower and other projects is getting larger and larger, and the stability of their surrounding rocks needs to be carefully studied. This need has strongly promoted the development of underground cavern mo...

AI Technical Summary

Problems solved by technology

The main problem is that the elastic modulus of the anchor cable material cannot be adjusted arbitrarily, and it is very difficult to find a model anchor cable material that strictly meets the requirements of the similarity ratio. In the model test, it is necessary to synthesize multiple anchor cables in actual engineering into one root, cannot accurately simulate the distribution of anchor cables in actual engineering; it is difficult to use in model tests with a relatively large similarity rate; the control of the pull force of model anchor cables is not accurate enough

[0007] (1) The stiffness of the selected anchor cable material is relatively fixed, which cannot meet the requirements of various similarity ratios

[0008] (2) It is very difficult to find anchor cable materials that strictly conform to the similarity ratio of the elastic modulus of the model material. In the model test, multiple anchor cables in the actual project need to be combined into one, and the distribution of the anchor cables in the actual project cannot be accurately simulated; Difficult to use in model tests with a relatively large similarity rate

[0009] (3) The stiffness of the selected anchor cable material is generally relatively large. When the similarity rate of the model test is relatively large, the stiffness of the anchor cable cannot satisfy

[0010] (4) The anchor cable loading method is relatively complicated, which cannot meet the requirements of the construction conditions in the model test cavern

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