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Novel mixed boundary true triaxial apparatus capable of independently loading in three directions

A true triaxial instrument, independent loading technology, applied in the direction of applying stable tension/pressure to test the strength of materials, instruments, scientific instruments, etc., can solve problems such as friction effect, rigid plate influence, interference, etc. The effect of eliminating the influence and reducing the friction effect

Active Publication Date: 2021-03-02
HOHAI UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a new type of mixed boundary true triaxial instrument with independent loading in three directions. Through this device, the loading force transmission device can cooperate with the deformation of the soil body, avoiding interference with loading in other directions, and effectively solve the problem of loading. End friction effect and the influence of rigid plates on the shear failure surface

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  • Novel mixed boundary true triaxial apparatus capable of independently loading in three directions
  • Novel mixed boundary true triaxial apparatus capable of independently loading in three directions
  • Novel mixed boundary true triaxial apparatus capable of independently loading in three directions

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Embodiment Construction

[0044] A new hybrid boundary true triaxial instrument with three-way independent loading of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Such as figure 1 , Figure 13 and Figure 14 As shown, a new type of mixed boundary true triaxial instrument with independent loading in three directions, including setting at the maximum principal stress σ of the sample 1 Direction of semi-rigid loading system 1, set the principal stress σ in the specimen 2 Direction of the hybrid loading system 2 and set at small principal stresses σ 3 Direction of flexible loading system 3.

[0046] Place the true triaxial instrument of this embodiment on the upper and lower sides, the front and rear sides and the left and right sides of the cuboid sample, and apply a large principal stress σ to the sample respectively 1 , medium principal stress σ 2 and the small principal stress σ 3 .

[0047] The ...

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Abstract

The invention provides a novel mixed boundary true triaxial apparatus capable of independently loading in three directions, and belongs to the technical field of indoor geotechnical test equipment. The apparatus comprises a semi-rigid loading system (1) arranged in the large main stress sigma 1 direction of a sample, a mixed loading system (2) arranged in the main stress sigma 2 direction of the sample, and a flexible loading system (3) arranged in the small main stress sigma 3 direction. The synchronous deformation of a sigma 2 direction loading device and the sample can be ensured, soil particle embedding is prevented, and meanwhile, additional shear stress generated by the sigma 2 direction loading device is weakened; the sigma 1 loading system and the sigma 2 loading system are semi-rigid, and the sigma 3 loading system is flexible, so that the influence of rigid surface loading on a shearing surface can be completely eliminated. According to the novel mixed boundary true triaxialapparatus provided by the invention, independent loading is carried out in three directions of a stress space without mutual interference, a true triaxial test under a complex stress path can be realized, and a relationship between a real shearing surface of a soil body and a stress-strain is obtained.

Description

technical field [0001] The invention relates to a novel mixed boundary true triaxial instrument with independent loading in three directions, and belongs to the technical field of indoor geotechnical test equipment. Background technique [0002] The true triaxial test loading force transmission device is a kind of indoor geotechnical test equipment in the field of civil engineering. The sample of the true triaxial test is a cube, and the principal stress component σ is applied to the three faces of the cube respectively. 1 , σ 2 , σ 3 , in order to truly simulate the three-dimensional stress state of the soil, and combine the three principal stresses arbitrarily, the three-dimensional stress-strain relationship of the soil under any stress state can be obtained. Compared with the conventional triaxial test, the true triaxial test can study the mechanical properties of the soil under complex stress states, and is the main instrument for studying the constitutive model of th...

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Application Information

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IPC IPC(8): G01N3/08G01N3/02
CPCG01N3/02G01N3/08G01N2203/0019
Inventor 朱俊高潘蕾朱材峰王龙包梦蝶
Owner HOHAI UNIV
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