A test device for measuring the change of shear strength parameters during the consolidation process of soft clay

A technology of shear strength and parameter change, applied in measuring devices, using stable shear force to test material strength, soil material testing, etc. and other problems, to achieve the effect of rich experimental types and universality

Active Publication Date: 2018-11-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the direct shear instrument and the triaxial instrument can reflect the characteristics that the shear strength of the soil increases with the increase of the effective stress of consolidation before shearing through experiments under different effective stress conditions of consolidation before shearing, they are different from those of soft clay foundations in actual engineering. Combined with simultaneous shearing, that is, the shear failure mechanism under the coupling of volume change and pore pressure is not consistent, and it cannot reflect the gradual change process of the shear strength of soft clay from the undrained state to the drained state.

Method used

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  • A test device for measuring the change of shear strength parameters during the consolidation process of soft clay
  • A test device for measuring the change of shear strength parameters during the consolidation process of soft clay
  • A test device for measuring the change of shear strength parameters during the consolidation process of soft clay

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Embodiment 1

[0032] The invention relates to a test device for measuring changes in shear strength parameters of soft clay during consolidation. It includes a frame 1, a loading plate 2, six miniature cross-plate shear meters 3 with pore pressure test function, a torsion meter, Sample room 5, measuring unit and lifting mechanism for placing samples;

[0033] A drainage device is arranged in the bottom of the sample chamber 5, which includes a drain plate 6 and a drain pipe 7. The sample chamber 5 is a cylinder, and the drain plate 6 is a circular plate with the same diameter as the inner diameter of the sample chamber 5;

[0034] The drain plate 6 is set at the bottom of the sample chamber 5. The drain plate 6 and the bottom of the sample chamber 5 form a drain cavity. One end of the drain pipe 7 rotates to communicate with the drain cavity, and the other end of the drain pipe 7 can be adjusted to the sample chamber. The top wall of 5 is high, and the drain pipe 7 is located outside the sample ...

Embodiment 2

[0057] Such as figure 1 As shown, a test device for measuring changes in shear strength parameters of soft clay in the consolidation process includes a frame 1, a loading plate 2, six miniature cross-plate shear meters with a pore pressure test function 3, a torsion meter, and Sample room 5, measuring unit and lifting mechanism for placing samples;

[0058] The bottom of the sample chamber 5 is provided with a drain device, which includes a drain plate 6 and a drain pipe 7; the drain plate 6 is set at the bottom of the sample chamber 5, and the drain plate 6 and the bottom of the sample chamber 5 form a drain cavity for draining water. One end of the pipe 7 rotates to connect to the drainage cavity, and the other end of the drainage pipe 7 can be adjusted to be flush with the top wall of the sample chamber 5. The drainage pipe 7 is located outside the sample chamber 5; the sample chamber 5 is a cylinder with a drainage plate 6 is a circular plate with the same diameter as the inn...

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Abstract

The invention relates to a testing device for measuring the shearing strength parameter changes in the solidifying process of soft clay and belongs to the technical field of soft clay analyzing devices. The testing device comprises a frame, a loading plate, miniature vane shearing instruments with a pore pressure testing function, a torsion meter, a sample chamber, a measuring unit and a lifting mechanism. The loading plate is arranged above the sample chamber, and the loading plate or the sample chamber is arranged on the frame through the lifting mechanism. The measuring unit comprises sensors used for collecting pore water pressure, soil pressure, displacement and other information. By means of the testing device, a shearing failure mechanism without volume change action or a shearing failure mechanism without pore pressure action can be independently studied, a shearing failure mechanism under volume change and pore pressure coupled action can be studied at the same time, and more testing types are achieved; shearing strength changes caused by soil body changes and pore pressure changes in the loading and solidifying process of soft clay can also be studied, and the changing rules of the shear strength parameters in the whole study process along with the solidifying process can be studied.

Description

Technical field [0001] The invention relates to a test device for measuring changes in shear strength parameters of soft clay during consolidation, and belongs to the technical field of soft clay analysis devices. Background technique [0002] The shear strength of soft clay will increase as the pore pressure dissipates and the effective stress increases during the consolidation process. The stability of the foundation will also dynamically develop with the loading process and changes in shear strength. Therefore, when analyzing the stability of soft clay foundations, it is necessary to consider the changes in shear strength caused by soil deformation and pore pressure changes during the loading and consolidation process in order to carry out the transition from the short-term stability during the loading construction period to the normal service period The long-term stability, that is, the stability analysis of the entire life cycle. The engineering case of instability failure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24G01N33/24
CPCG01N3/24G01N33/24G01N2203/0025
Inventor 雷国辉高翔林城福
Owner HOHAI UNIV
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