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Testing method of soil shear strength parameters based on temporary plastic load formula

A shear strength and parameter testing technology, applied in the direction of using a stable shear force to test the strength of materials, can solve the problems of artificial limitation of shear plane, uneven distribution of shear stress, shrinkage of shear plane, etc., to achieve the test process. Fast, accurate test results, and low operating skills

Active Publication Date: 2019-09-17
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

[0002] The shear strength parameters of the soil, namely the cohesion c and the internal friction angle φ, are the two most important mechanical parameters of the soil. The tests for testing the shear strength parameters of the soil in engineering include indoor tests and outdoor tests (field experiments In-situ test), indoor test includes direct shear test, triaxial compression test and unconfined compressive strength test; compared with indoor test, in-situ test on site does not disturb the soil, so it has more engineering advantages, especially For soils that are difficult to sample, in-situ tests are irreplaceable. Currently, in-situ tests for testing soil shear strength parameters mainly include cross-plate shear tests and large-scale direct shear tests. Cross-plate shear tests are used to determine saturation For the undrained shear strength of soft clay (φ≈0), the large-scale direct shear test is not only costly (three tests with different vertical pressures are required to obtain a set of c and φ values), but also the same as the indoor direct shear test There are inherent disadvantages: the shear surface is artificially limited, the shear stress distribution is uneven, and the shear surface gradually shrinks. Currently, large-scale direct shear tests are used to test the shear strength of coarse-grained soils
At present, there is no better in-situ test that can accurately, quickly and economically test the shear strength parameters of the excavated body, so new test methods need to be developed

Method used

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  • Testing method of soil shear strength parameters based on temporary plastic load formula
  • Testing method of soil shear strength parameters based on temporary plastic load formula
  • Testing method of soil shear strength parameters based on temporary plastic load formula

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Embodiment Construction

[0032] Theoretical analysis shows that under the action of vertical pressure, the edge of the base of the strip foundation first enters the plastic state. The soil mechanics textbook gives the PCR formula for the immediate plastic load of the strip foundation, as shown in formula (1),

[0033]

[0034] In the formula, q is the vertical stress caused by the self-weight of the soil at the bottom of the foundation.

[0035] It can be seen from formula (1) that the subgrade plastic load p cr There is a direct correspondence with the cohesion c of the soil and the internal friction angle φ. When the long-strip bearing plate is used to carry out the load test, according to the difference q(q 1 ,q 2 ) test two p cr (p cr1 ,p cr2 ) value, that is, the unearthed c and φ values ​​can be back-calculated from formula (1), and the calculation formula is shown in formula (2.1), (2.2).

[0036]

[0037]

[0038] In the formula,

[0039] In the derivation process of formula (...

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Abstract

The invention discloses a soil shear strength parameter testing method based on a critical edge loading formula. The shear strength parameter of soil can be tested in an accurate, rapid, and economicmode. A loading test of the loading plate is developed, two different earth surface load values q1 and q2 are applied at two sides of the loading plate, critical edge load values pcr1 and pcr2 are respectively tested according to the different earth surface load values q1 and q2, and soil cohesive force value c and a soil internal friction angle value Phi are subjected to inverse computation by apcr formula.

Description

technical field [0001] The invention relates to a method for testing soil shear strength parameters, in particular to a method for testing shear strength parameters of excavated soil through a bearing plate load test by using a temporary plastic load formula. Background technique [0002] The shear strength parameters of the soil, namely the cohesion c and the internal friction angle φ, are the two most important mechanical parameters of the soil. The tests for testing the shear strength parameters of the soil in engineering include indoor tests and outdoor tests (field experiments In-situ test), indoor test includes direct shear test, triaxial compression test and unconfined compressive strength test; compared with indoor test, in-situ test on site does not disturb the soil, so it has more engineering advantages, especially For soils that are difficult to sample, in-situ tests are irreplaceable. Currently, in-situ tests for testing soil shear strength parameters mainly incl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24
Inventor 许年春吴同情赵宝云况龙川黄伟吴越李东升
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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