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Method and symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength

A technology of shear strength and in-situ testing, which is applied in the direction of applying stable shear force to test material strength, strength characteristics, instruments, etc., can solve the problem of shear strength measurement of pile-soil interface on site, instrument maintenance and maintenance costs. Expensive, increased manufacturing cost of the direct shearing instrument, etc., to achieve the effect of easy field use, fewer components, and simple assembly

Pending Publication Date: 2018-06-01
SHENZHEN UNIV
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Problems solved by technology

However, with the increasing complexity and precision of direct shear test instruments, the manufacturing cost of direct shear instruments has gradually increased, and the maintenance and maintenance costs of the instruments have become increasingly expensive. Measurement of Shear Strength of Pile-Soil Interface at Construction Site

Method used

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  • Method and symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength
  • Method and symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength
  • Method and symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the description of the drawings and specific embodiments.

[0033] Such as Figure 1 to Figure 3 As shown, a symmetrical direct shear instrument for in-situ testing of the shear strength of the pile-soil interface includes a support 1, and the support 1 is provided with two symmetrically distributed shearing devices, and the shearing devices include shearing devices. The cutting box 11, the fan-shaped distributed normal force providing mechanism for applying normal force to the soil sample 100 in the shearing box 11, the shear displacement measuring mechanism for measuring the shear displacement of the shearing box 11, and the Shearing box 11 applies the weight 16 of shearing force, wherein, said shearing box 11 is provided with the soil sample placing cavity of placing soil sample 100 and the shearing box upper cover 5 that controls described soil sample placing cavity, The shear box upper cover...

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Abstract

The invention provides a symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength. The symmetrical direct shear apparatus comprises a bracket; two shearing deviceswhich are distributed symmetrically are arranged on the bracket; each shearing device comprises a shearing box, a fan-shaped distribution type normal force providing mechanism which is used for applying normal force to a soil sample in the shearing box, a shearing displacement mechanism which is used for measuring the shearing displacement of the shearing box, and a counterweight which is used forapplying shearing force to the shearing box. The invention also provides a method for the in-situ testing of the pile-soil interface shear strength. The symmetrical direct shear apparatus and the method have the beneficial effects that the normal force which is distributed uniformly is applied by utilizing the fan-shaped distribution type normal force providing mechanism without externally connecting a pressure source or loading equipment; the magnitudes of the normal force at various points of the interface are the same and point to a circle centre by applying the normal force through the fan-shaped distribution type normal force providing mechanism in the centre of a sample, so that a shearing surface is stressed uniformly, and the deviation of test results caused by the fact that the sample is loaded eccentrically is avoided.

Description

technical field [0001] The invention relates to a symmetrical direct shear instrument, in particular to a method for in-situ testing of the shear strength of a pile-soil interface and a symmetrical direct shear instrument. Background technique [0002] The direct shear test was first used by Alexandre Collin for slope stability research more than 100 years ago. At present, the development and development technology of indoor direct shearing instruments is relatively mature. In addition to the conventional small direct shearing instruments, some large direct shearing instruments have been developed at home and abroad. The shearing boxes are in various forms and sizes. There are many types of direct shear instruments, but the basic principle is the same. The samples are loaded into the shear box, and the horizontal shear force is applied under different vertical pressures σ to shear the sample, so that the sample is sheared at the upper and lower sides. From shearing to failu...

Claims

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Application Information

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IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0676G01N2203/0682G01N2203/0298G01N2203/0025G01N2203/0033Y02A10/23
Inventor 苏栋黄俊杰明海燕陈锐陆钊
Owner SHENZHEN UNIV
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