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In-situ test method used in soft soil wall rock tunnel

An in-situ test technology in a tunnel, which is applied in the direction of soil material testing, material inspection products, etc., can solve the problems of large spacing between measuring points, long cycle, high cost, etc., and achieve short test project cycle, strong timeliness, and The effect of low cost

Active Publication Date: 2015-03-25
CHINA RAILWAY TUNNEL GROUP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This test method has the following disadvantages: first, due to the large buried depth of the mountain tunnel, the penetration depth is large, the in-situ test has a large amount of engineering, a long cycle, and high cost; second, the hole layout of the measuring points is relatively large , not fine enough, the timeliness of the obtained geotechnical parameters is not strong enough, it is impossible to carry out real-time testing of the geotechnical parameters within the influence range of the excavation face, and understand the geotechnical engineering characteristics within the influence area of ​​the excavation face

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  • In-situ test method used in soft soil wall rock tunnel
  • In-situ test method used in soft soil wall rock tunnel
  • In-situ test method used in soft soil wall rock tunnel

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Embodiment Construction

[0022] The present invention is described in conjunction with accompanying drawing and specific embodiment:

[0023] like figure 1 , 2 , 3, and 4, a kind of in-situ test method used in the tunnel, after the upper step 1 is formed in the tunnel construction, along the direction of tunnel excavation, measuring holes 5 are arranged on the face 9 of the upper step, and the connection is completed. The flat shovel probe rod 10 and the shovel head 11 are placed vertically, hammered or statically pressed into the measuring hole to a certain depth, and the soil in front of the tunnel face 9 is tested, that is, at the tunnel face (9) along the tunnel excavation direction The way of horizontal penetration into the flat shovel dilatometer (such as figure 2 ), in order to quickly, easily and accurately test the physical and mechanical parameters of the soil within a certain range in front of the face (9), the specific steps are as follows:

[0024] a. First excavate the upper part of ...

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Abstract

The invention provides an in-situ method used in a soft soil wall rock tunnel. By the method, physical and mechanics parameters of a soil body in a certain range in front of a tunnel face (9) are fast, simply and exactly tested in a manner that a flat spade (11) horizontally penetrates the tunnel face (9) along the excavation direction of a tunnel, so that basis for evaluating geological conditions of a site and analysing the stability of the wall rock is provided in a construction process.

Description

technical field [0001] The invention belongs to the in-situ testing technology of geotechnical engineering, and mainly proposes a method for testing the physical and mechanical parameters of surrounding rocks of weak soil tunnels in caves. Background technique [0002] For the geological survey of tunnels in the planning stage, people often use the data obtained from the survey of a few local boreholes as the basis for design. In places with complex geological conditions, tunnel construction has greater risks. Especially for soil surrounding rock tunnels, large deformation or landslide damage are prone to occur after excavation. Therefore, it is necessary to carry out certain in-situ tests during the construction process to fully understand and master the physical and mechanical properties of the soil. Make necessary adjustments and amendments to the plan. [0003] Traditionally, in-situ testing of the ground is used for tunnel engineering, mainly using penetrating tests a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 洪开荣于少辉李治国白中坤朱得华王光辉杨立新常翔杨朝帅李辉
Owner CHINA RAILWAY TUNNEL GROUP CO LTD