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Multi-span sandy gravel stratum model testing device

A stratum model and test device technology, applied in soil material testing, material inspection products, etc., can solve problems such as collapse and easily damaged stratum balance, and achieve the goal of improving stability, reducing boundary effects, and reducing the difficulty of excavation control Effect

Active Publication Date: 2018-06-19
CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, excavating tunnels in pebble strata can easily destroy the original stratum balance state, cause large stratum losses, and even lead to collapse

Method used

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  • Multi-span sandy gravel stratum model testing device
  • Multi-span sandy gravel stratum model testing device
  • Multi-span sandy gravel stratum model testing device

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Experimental program
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Embodiment Construction

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] device design

[0020] (1) Determine the geometric similarity ratio of the model test

[0021] In order for the model test to be closer to the actual tunnel excavation situation, it was decided to use a large-scale model test; in order to reduce the influence of the boundary effect of the model box, the overall length of the model box was 4 to 5 times the span of the tunnel excavation. The model of this device is used for experimental research to solve the problem of plane strain. If the length of the model box is too long, the span of the tunnel excavation is too large, and the test excavation is difficult to control; moreover, if the longitudinal length is short, the stability of the overall model box is poor. . Therefore, based on factors such as the large-scale model test and the overall scale of the model test chamber, the geo...

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Abstract

The invention relates to a multi-span sandy gravel stratum model testing device, and belongs to the field of tunnel construction. The device comprises a cuboid box, and comprises three span open poresfrom small to big which are a two-lane span open pore, a three-lane span open pore and four-lane span open pore respectively; each span open pore comprises a span open pore template and a span open pore splicing part; the span open pores are formed in the bottom of the middle part of the box, and are tunnel arched open pores; the length of the box is four times of the maximum excavation span, andthe geometric similarity ratio is 1: 20. According to the multi-span sandy gravel stratum model testing device, the influence of model box boundary effect is reduced, the factors such as plane strainproblem, large scale model test and model tests box integral scale are comprehensively considered, the excavation control difficulty is effectively reduced, the integral stability of the box is improved, and the device has important engineering significance for multi-span sandy gravel stratum implemented tunnel excavation model tests.

Description

technical field [0001] The invention belongs to the field of tunnel construction and relates to a multi-span sand and pebble stratum model test device. Background technique [0002] The sandy pebble formation has a loose structure and has the characteristics of large inter-particle gaps, no cohesion, high sensitivity and strong discreteness. Therefore, excavating tunnels in pebble strata can easily destroy the original stratum balance state, cause large stratum losses, and even lead to collapse. Therefore, it is of great engineering significance to carry out tunnel excavation model tests based on the unique mechanical properties of pebble formations. Contents of the invention [0003] In view of this, the object of the present invention is to provide a kind of multi-span sand pebble formation model test device, [0004] To achieve the above object, the present invention provides the following technical solutions: [0005] Multi-span sand and pebble formation model test ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24Y02E10/20
Inventor 曹鹏方林吴梦军郭鸿雁丁浩张琦胡学兵夏杨于雨
Owner CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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