Segmental unloading excavator for segmental excavating of simulated rock tunnel
A technology for tunnels and rocks, applied in the field of section unloading excavators, which can solve problems such as uneven stress, differential distribution of surrounding rock stress, deformation, etc., and achieve the effects of simple structure, convenient operation, and high flexibility
Active Publication Date: 2018-12-11
SOUTHEAST UNIV +1
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Problems solved by technology
[0005] Technical problem: The purpose of this invention is to provide an unloading excavator that can more realistically simulate the unloading process of sectioned excavation of rock tunnels under a relatively high stress state. Excavation ignores the time-space effect of surrounding rock deformation caused by segmental excavation, especially for insufficient rigidity of the excavator, uneven stress will lead to differential distribution of surrounding rock stress and large deformation of surrounding rock before excavation. The problem
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[0024] In order to make the object, technical solution and advantages of the invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art all fall within the appended claims of the present application to the modifications of various equivalent forms of the present invention. limited range.
[0025] Figure 1-3 As shown, a segmental unloading excavator for simulating segmental excavation of rock tunnels includes: a sliding shaft, a handle, a positioning plate, and a steel pipe sheet, wherein the sliding shaft is composed of an inner shaft, a steel ball, and a fixed collar. The positioning plate is welded at the end of the sliding shaft. The positioning plate is used to locate...
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Abstract
The invention discloses a segmental unloading excavator for segmental excavating of a simulated rock tunnel. The segmental unloading excavator comprises a sliding shaft (1), a handle (2), a positioning plate (3) and a plurality of steel tube pieces (4), wherein one plate surface of the positioning plate (3) is fixed with a tail end of the sliding shaft (1) while the other plate surface is integrally connected with the handle (2); the steel tube pieces (4) are arranged around the exterior of the sliding shaft (1), are in contact with bulges on an outer wall of the sliding shaft (1) and are supported and clung to an inner wall of a to-be-simulated tunnel by the sliding shaft (1); an outer diameter of the positioning plate (3) is more than an inner diameter of the to-be-simulated tunnel. Thus, the sliding shaft and the steel tube pieces supported by the sliding shaft instead of the traditional liquid capsule and wax are adopted by the invention, for realizing 'loading first and then excavating'. The segmental unloading excavator disclosed by the invention is capable of bearing higher stress, is high in rigidity, is not easy to deform, can be used for replacing an excavating part of the rock tunnel, and is composed of common easily fastened parts.
Description
technical field [0001] The invention relates to the field of simulation tests for high ground stress rock tunnel tests, in particular to a segmental unloading excavator for simulating segmental excavation of rock tunnels. Background technique [0002] During the implementation of my country's western development strategy, long and long tunnels have become a controlling project in transportation construction and energy development. With the gradual development of underground tunnel projects in the direction of large buried depths, high ground stress has become a major problem faced by underground tunnel projects. Geological disasters such as rockburst, large deformation, and earthquake damage related to high ground stress have always been a worldwide problem in the tunnel and underground engineering field. Therefore, it is very necessary to conduct physical model research on the brittle failure characteristics of surrounding rock rockburst caused by rock tunnel excavation, w...
Claims
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Login to View More IPC IPC(8): G01N3/02
CPCG01N3/02
Inventor 潘皇宋杜广印王坤李兴峰谢任飞杜俊黎夏涵覃达
Owner SOUTHEAST UNIV