Manual stress control type triaxial compressor

Abstract

The invention discloses a manual stress control type triaxial compressor. The manual stress control type triaxial compressor comprises a simple triaxial compressor part (2) and three manual water column pressure control parts (see (1) for a single structure) used for controlling an axial pressure, an ambient pressure and a reverse pressure respectively. According to the manual stress control type triaxial compressor disclosed by the invention, loading for the axial pressure, the ambient pressure and the reverse pressure of the triaxial compressor is realized by virtue of the three manual water column pressure control systems (1) respectively, and the simplified triaxial compressor part (2) is combined, so that the triaxial compressor has the advantages of being intuitive in principle, simple and convenient to operate, stable in performance, easy to maintain, low in cost, and the like. The large triaxial compressor produced by the structure disclosed by the invention is especially suitable for survey and design units in disaster prevention and control engineering to carry out large triaxial compression tests on soft soil, saturated soil, slip soil and the like.

Description

technical field [0001] The invention relates to a triaxial compression test instrument, in particular to a manual stress control geotechnical triaxial compression instrument. Background technique [0002] In the rainy season every year, a large number of excavated slopes of roads, channels and housing construction projects composed of special soil or thick rock weathering belts in southern my country have landslide damage. It is a very difficult technical problem faced by survey and design personnel. Because the sliding zone soil is often granular and contains large-grained soil such as coarse cuttings and gravel, it is difficult to obtain a shear strength index that is closer to the actual engineering practice with a small triaxial compression instrument due to the size effect. The large-scale geotechnical triaxial compression instrument can eliminate the size effect, so it can provide a shear strength index closer to the actual engineering, but because the existing geotech...

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Problems solved by technology

Since the sliding zone soil is often granular and contains large-grained soil such as coarse cuttings and gravel, it is difficult to obtain a shear strength index that is closer to the actual engineering situation with a small triaxial compression instrument due to the size effect.

The large-scale geotechnical triaxial compression instrument can eliminate the size effect, so it can provide a shear strength index closer to the actual engineering, but because the existing geotechnical triaxial compression instrument is very expensive, at present, my country's geotechnical engineering and geological disasters The geotechnical laboratories of the investigation, design and construction units of prevention and control projects are rarely equipped, which makes the actual design often use the back analysis method alone to estimate the shear strength index of the slip zone soil

[0003] The cost of large-scale geotechnical triaxial compression instruments is very expensive. The main reason is that the manufacture of large geotechnical triaxial compression instruments is currently developing in the direction of high-precision and automatic control such as hydraulic servo, fully automatic control, true triaxial, and unsaturated triaxial. Automatic control of the instrument operating system, automatic data collection and function expansion are the main reasons for the high price of the instrument; in addition, the axial loading of the existing large-scale geotechnical triaxial compression instruments is basically a strain-controlled type, which is achieved through mechanical devices or hydraulic pressure. The servo provides displacement to apply axial force to the sample. Therefore, the larger the sample area, the greater the force to be applied, the larger the mechanical device or hydraulic servo that needs to be equipped, and the higher the requirements for the control system. Manufacturing The cost of the instrument also increases

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