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A test device for simulating tunnel excavation and unloading

A technology of tunnel excavation and test equipment, which is applied in the direction of measuring equipment, instruments, scientific instruments, etc., can solve the problems of uneven melting degree, differential distribution and insufficient stress performance of surrounding rock, and achieve rigidity that is not easily deformed, high rigidity, Construct simple effects

Active Publication Date: 2020-03-24
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a test device for simulating tunnel excavation and unloading, which solves the problem of only simulating the instantaneous excavation of the full section during model excavation, thereby ignoring the time-space effect of surrounding rock deformation caused by excavation, especially for "heating and melting" As far as the method is concerned, the inhomogeneous melting degree leads to the insufficient distribution of surrounding rock stress performance differences.

Method used

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  • A test device for simulating tunnel excavation and unloading
  • A test device for simulating tunnel excavation and unloading
  • A test device for simulating tunnel excavation and unloading

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] like figure 1 , 2As shown, a test device for simulating tunnel excavation and unloading includes a central axis 1, a support structure 2 and a steel pipe sheet 3. The steel pipe sheet 3 is an arc-shaped sheet and there are more than two pieces. The inner wall of the tunnel is compatible, and more than two pieces of steel pipe sheets 3 are sequentially attached to the inner wall of the tunnel to be simulated, and a cylindrical inner cavity 4 is formed between more than two pieces of steel pipe sheets 3; the central axis 1 is set on a cylindrical At the central axis of the inner cavity 4, the supporting structure 2 includes a connecting rod 5 and a supporting rod 6 respectively connected to both ends of the connecting rod 5, wherein the connecting rod 5 is fixedly installed on the central axis 1 through the supporting rod 6, and the connecting rod 5 is also installed Bearing 7 is arranged, and bearing 7 is connected with the inner pipe wall sliding support of steel pipe ...

Embodiment 2

[0045] like figure 1 , 3 As shown, compared with Embodiment 1, this embodiment optimizes the connecting rod 5, and a bearing installation through hole 8 is opened along the shaft of the connecting rod 5, and there are more than two bearings 7, which are arranged in sequence and installed in the bearing installation through hole 8 Inside.

[0046] In this embodiment, multiple bearings 7 can achieve unloading more stably, and at the same time, by opening bearing installation through holes 8, multiple bearings 7 can be installed more neatly, avoiding the problem of large levelness errors between bearings 7 .

Embodiment 3

[0048] like image 3 , 4 , 6, compared with Embodiment 1, this embodiment optimizes the connection between the connecting rod 5 and the supporting rod 6, the two ends of the connecting rod 5 are provided with limiting grooves 9, and the connection between the supporting rod 6 and the connecting rod 5 A limiting block 10 is provided, and the limiting block 10 is located in the limiting groove 9 and is fixedly connected to the connecting rod 5 and the limiting groove 9 by bolts and nuts.

[0049] In this embodiment, the support rod 6 and the connecting rod 5 are fixedly connected together by bolts and nuts, and at the same time, it is also possible to adjust the angle between the support rod 6 and the connecting rod 5 in order to adapt to the size of the inside of the simulated tunnel. To change the position of the connecting rod 5 relative to the central axis 1, when adjusting, it is only necessary to loosen the nut, then adjust the angle, and after the angle is adjusted, tigh...

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Abstract

The invention discloses a device for tunnel excavation and unloading. The device comprises a center shaft, support structures and steel tube pieces, wherein the two or more steel tube pieces are arranged and are arc-shaped pieces; the radians of the steel tube pieces are compatible with the inner wall of a tunnel to be simulated; the two or more steel tube pieces are sequentially stuck on the inner wall of the tunnel to be simulated in a surrounding way, and a cylindrical inner cavity is formed by the two or more steel tube pieces; the center shaft is arranged at a central axis of the cylindrical inner cavity; each support structure comprises a connecting rod and support rods respectively connected with the two ends of the connecting rod; the connecting rods are fixedly installed on the center shaft by means of the support rods; bearings are also installed on the connecting rods; the bearings are connected with the inner tube walls of the steel tube pieces in a sliding support way. Thedevice for tunnel excavation and unloading has the beneficial effect that the device can well replace a water bag and wax in the traditional scheme, thus realizing first loading and then excavating.

Description

technical field [0001] The invention belongs to the technical field of underground engineering tests, and relates to a physical model test of a deep-buried high-in-situ stress tunnel, in particular to a test device for simulating tunnel excavation and unloading, which provides an excellent excavation solution for tunnel-related physical model tests, and further provides research and analysis Provide scientific understanding of surrounding rock stress changes and brittle failure characteristics such as rockburst during tunnel excavation. Background technique [0002] With the development of western my country, underground and tunnel projects in western China are gradually developing towards the Tibetan plateau. Complex geological conditions such as large buried depth and high ground stress have become major problems faced by builders and researchers. Among them, hard and brittle rock mass Generally speaking, high ground stress rockburst is the main engineering geological probl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
Inventor 李天斌郭庚焮华春翔高进
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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