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Double-cross detector and testing method for testing shearing strength values of soil mass in situ

A technology for in-situ testing of shear strength, applied in the field of in-situ testing of soil shear strength, double cross shear plate, can solve problems such as unstrict calculation methods, improve test accuracy and overcome complex operations , to overcome the effect of soil disturbance

Inactive Publication Date: 2014-04-09
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for soil, due to the different degrees of consolidation or the influence of anisotropy, the shear strength values ​​in the horizontal and vertical directions are generally not equal, and the cross-plate shear test is During the calculation of the strength value, the shear strength values ​​in the horizontal direction and the vertical direction of the soil are regarded as the same value, so the calculation method is not strict, which is a shortcoming of the cross plate shear instrument

Method used

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  • Double-cross detector and testing method for testing shearing strength values of soil mass in situ
  • Double-cross detector and testing method for testing shearing strength values of soil mass in situ
  • Double-cross detector and testing method for testing shearing strength values of soil mass in situ

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Experimental program
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Effect test

Embodiment 1

[0062] The in-situ shear test of the soil was carried out in the A test area. The specifications of the cross plate are: the height of a single plate is 30mm, the width is 90mm, the aspect ratio is 1:3, and the diameter of the circular tube in the center of the shear plate is 11.5mm. The soil is silt, and the distance between the test points is 1m (do a test every 1m), τ 1 For the horizontal shear strength value tested by the inventive method (assuming that the shear stress on the horizontal plane is linearly distributed in the calculation, the center of circle is zero, and the circumference is the maximum value τ 1 ), τ 2 For the vertical shear strength value tested by the method of the present invention, τ 3 In order to use the conventional cross-plate shearing instrument to test the shear strength value next to the aforementioned test site, the test results are shown in Table 1, and the strength C u (KPa) changes with depth h(m) as Figure 7 shown.

[0063] Table 1 Test...

Embodiment 2

[0066] The in-situ shear test is carried out in the B test area, the specifications of the cross plate are the same as in Example 1, the soil quality of the test area is silt and muddy clay, and the distance between the test points is 1m, τ 1 , τ 2 , τ 3 The meaning of is the same as in Example 1, and the test results are shown in Table 2, and the intensity C u (KPa) changes with depth h(m) as Figure 8 shown.

[0067] Table 2 Test values ​​of test area B

[0068]

[0069] As can be seen from the results of the above 2 tests, the horizontal direction shear strength value τ of the soil body tested by the instrument and test method of the present invention is 1 and the shear strength value τ in the vertical direction 2 Regularly distributed, in C u -h graph represented as τ 2 -h line with τ 3 The -h line roughly coincides, which is consistent with the test value of the conventional cross-plate shearer mainly reflecting the shear strength value on the vertical surface ...

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Abstract

The invention relates to an instrument for testing the shearing strength values of a soil mass in situ, and belongs to the technical field of rock and soil engineering. One-way bearings comprise an upper one-way bearing and a lower one-way bearing, and connectors comprise an upper connector and a lower connector; the longitudinal sections of the upper connector and the lower connector are funnel-shaped, one wider ends of the upper connector and the lower connector are respectively fixed together with the upper one-way bearing and the lower one-way bearing, and the upper connector is sleeved on the outer side of the lower connector; and shearing plates are divided into an upper shearing plate and a lower shearing plate, the cross sections of the shearing plates are crossed, and the upper shearing plate and the lower shearing plate are respectively fixed together with the upper connector and the lower connector. Through the instrument, the shearing strength values of the soil mass in the horizontal direction and the vertical direction can be respectively measured, and the defect that the conventional cross plate shearing instrument cannot separate the two shearing strength values is overcome. By separating the shearing strength values in the horizontal direction and the vertical direction, the testing precision of the in-situ shearing strength values of the soil mass is improved.

Description

technical field [0001] The invention is an instrument for in-situ testing of the shear strength of soil, and relates to a double cross shear plate composed of two identical cross plates with opposite shear directions. The instrument can test the horizontal direction of the soil respectively. and shear strength values ​​in the vertical direction. It belongs to the technical field of geotechnical engineering. Background technique [0002] At present, the shear strength tests of soil mainly include direct shear test, triaxial test, torsional shear test, unconfined compressive strength test and cross plate shear test, etc. The first four tests are all indoor tests, which need to take soil samples, which will inevitably disturb the soil samples and affect the test accuracy. The cross-plate shear test is an in-situ test method, which can avoid the influence of soil disturbance and is suitable for on-site determination of the in-situ undrained shear strength of saturated cohesive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24
Inventor 温文峰孙树林
Owner HOHAI UNIV
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