Full-section tunnel excavation seepage-stress coupling model test device and method

A technology of tunnel excavation and coupling model, which is used in measuring devices, using stable tension/pressure to test material strength, soil material testing, etc., which can solve the process that cannot consider the seepage-stress coupling mechanism and is difficult to simulate the gradual release of stress. and other problems, to achieve the effect of non-contact measurement of full-field strain and displacement with high accuracy

Pending Publication Date: 2020-09-25
SOUTH AFRICA SURVEY & DESIGN INST HUBEI
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Problems solved by technology

However, this test method is difficult to simulate the process of gradual stress release during tunnel advancement, and cannot consider the seepage-stress coupling mechanism during tunnel excavation

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  • Full-section tunnel excavation seepage-stress coupling model test device and method
  • Full-section tunnel excavation seepage-stress coupling model test device and method
  • Full-section tunnel excavation seepage-stress coupling model test device and method

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Embodiment Construction

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] Embodiments of the present invention provide a full-section tunnel excavation seepage-stress coupling model test device and method, which are used in saturated low-permeability formations.

[0042] Please refer to Figure 1-2 , figure 1 It is a structural top view of a full-section tunnel excavation seepage-stress coupling model test device in an embodiment of the present invention, figure 2 It is a side view sectional view of a full-section tunnel excavation seepage-stress coupling model test device in an embodiment of the present invention, specifically including: a pressure chamber, a surrounding rock model 5, a flat rubber water bladder 6, and a cylindrical rubber water bladder 7 , geotextile 8, pore water...

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Abstract

The invention provides a full-section tunnel excavation seepage-stress coupling model test device and method. A surrounding rock model is manufactured in a pressure chamber through a mold, a flat rubber water bag and a cylindrical rubber water bag are embedded into a gap in the outer side of the surrounding rock model and a hole in the center of the surrounding rock model respectively, and the rubber water bags are connected with hydraulic loaders through water pipes respectively and used for simulating the surrounding rock pressure and the stress release process in the tunnel excavation process. Geotextile is placed between the rubber water bags and the surrounding rock model, and the geotextile is connected with a hydraulic loader and used for applying pore water pressure boundaries. A pore water pressure sensor is pre-buried in the surrounding rock model and used for monitoring pore water pressure changes. The full-field strain and deformation of the rock mass model are measured ina non-contact manner by adopting a digital image acquisition system. The device and the method have the advantages that the device and the method are used for researching surrounding rock stress-strain characteristics and seepage-stress coupling characteristics in stress release procedures when tunnels in saturated low-permeability strata are excavated, and accordingly test support can be providedfor tunnel excavation.

Description

technical field [0001] The invention relates to the field of tunnel and underground space engineering, in particular to a full-section tunnel excavation seepage-stress coupling model test device and method. Background technique [0002] Saturated low-permeability stratum (such as mudstone) is a common geological situation in tunnel engineering. The construction of excavating tunnels in this stratum involves complex seepage-stress coupling problems: in the process of tunnel excavation, along with the tunnel As the surface advances, the stress of the surrounding rock is gradually released. In the process of stress redistribution in the surrounding rock, the pore water pressure will also change greatly and evolve with time. The mutual coupling between the surrounding rock stress and the pore water pressure has a great influence on the deformation and stability of the tunnel. An important research direction of tunnel engineering at present. [0003] Conducting model tests with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N15/08G01N33/24
CPCG01N3/12G01N15/082G01N33/24G01N2203/0019G01N2203/0048
Inventor 王发玲马郧龙晓东郭运冉锦绣李子优程先涛张灏张鹏王天琦赵昀程莹
Owner SOUTH AFRICA SURVEY & DESIGN INST HUBEI
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