Method for determining shear strength of chemically polluted soil and special full-automatic direct shear apparatus

A shear strength and chemical pollution technology, applied in the application of stable shear force to test the strength of materials, preparation of samples for testing, etc., can solve the problems of parameter deviation, measurement result deviation, limited guiding significance, etc. Small fluctuation, uniform corrosion distribution, and the effect of reducing disturbance

CN105547864AInactive Publication Date: 2016-05-04WUHAN POLYTECHNIC UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-05-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for determining the shear strength of chemically polluted soil and a special full-automatic direct shear apparatus. A chemical corrosion device is added for the direct shear apparatus compared with the prior art, infiltration holes are formed in the bottom of a shear box, and a notch groove is formed in the bottom of a container trough of the chemical corrosion device, so that when the method is adopted for determining, a chemical corrosion solution can be directly injected into the container trough to perform sealed maintenance; after maintenance is completed, vertical pressure loading is directly performed to complete a full-automatic direct shear test so that the pollutant corrosion situation of a soil body on site can be simulated, destroying-free maintenance of a tested soil sample is achieved, the influence of stress release in the sampling process is avoided, disturbance suffered by the soil body is reduced as far as possible, and the tested sample can be closer to the in-situ soil sample in property. In addition, due to the fact that the infiltration rate fluctuation of the chemical corrosion solution is smaller, a result is closer to the polluted situation of natural soil, corrosion distribution can be relatively uniform, the influence of local corrosion on the mechanical property determination of the soil sample is avoided, and the problem that a conventional direct shear apparatus cannot detect the shear strength and parameters of the chemically polluted soil is solved.
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Description

technical field

[0001] The invention belongs to the field of civil engineering instrument testing, and in particular relates to a method for measuring the shear strength of chemically polluted soil and a special automatic direct shear instrument. Background technique

[0002] The foundation soil layers of most industrial factories are eroded and damaged by chemical pollutants to varying degrees, resulting in attenuation of soil strength and bearing capacity, which in turn leads to uneven settlement, deformation, instability and damage of superstructure structures. In view of the particularity of the boundary environment of the foundation soil layer in industrial factories, the corrosion of chemical solutions should be considered in the design process of the bearing capacity of the foundation soil layer, which is very important to reasonably determine the bearing capacity and strength parameters of the foundation soil layer.

[0003] At present, in order to determine the bear...

Examples

Embodiment Construction

[0026] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0027] like figure 1 , figure 2 As shown, the automatic direct shear instrument of the present invention adds a chemical corrosion device on the basis of conventional direct shear test instruments. That is, the fully automatic direct shear instrument of the present invention includes a horizontal platform 4, a horizontal loading device, a vertical loading device, a data measurement and control device arranged on the horizontal platform 4, a shear box, and a chemical corrosion device. The chemical etching device is composed of a container tank 11 and a container cover 12. The container tank is slidably connected to the horizontal platform 4 through the horizontal ball guide rail 9 and the ball 10. The bottom is provided with an engraved groove 17, and the center of the bottom of the lower shear box 14 is provided with a The infiltration hole 7 is a...