Soil in-suit boring shearing testing device

Abstract

The invention discloses a soil in-suit boring shearing testing device. The soil in-suit boring shearing testing device is mainly composed of an operating deck 100, a vertical tensile mechanism 200, a shearing probe 300, and a support oil cylinder and pressurization air pump 400. When the soil in-suit boring shearing testing device is applied to borehole shear test, in-suit rapid determination of soil cohesive force and internal friction angle can be realized; compared with laboratory tests and borehole shear tests, obtained data is more simple and accurate; device portability is excellent; construction is simple; test operation and data collection can be completed only by one person; it can be determined that whether a plurality of sets of experiments are necessary based on field test results quickly; compared with indoor triaxial test and direct shear test, disturbance on soil is less, applicability is excellent; soil taking holes left by engineering preliminary stage geological exploration can be used directly, so that repeat boring is avoided, and resources are not wasted.

Description

technical field [0001] The invention relates to a rock-soil performance testing device, in particular to a device for measuring the shear strength parameters of fine-grained sandy soil, clay and silt soil in situ. Background technique [0002] In geotechnical engineering technology, the shear strength index cohesion and internal friction angle of soil are important mechanical properties and important parameters for engineering design calculation. Usually, indoor shear test and in-situ shear test are used to measure the shear strength index of soil. Indoor shear tests include triaxial tests and direct shear tests, which take hours or even days to conduct tests, and through the process of on-site sampling, sample making, etc., the disturbance to the soil is very large, and the drainage conditions are difficult to control , the above factors will cause the test results and the actual results are very different. The in-situ shear test is carried out in situ on the soil, and th...

AI Technical Summary

Problems solved by technology

At present, the rock drilling shear test device widely used in China can quickly detect the shear strength of soft rock and rock that cannot be cored at the test site. It has the advantages of simple operation and high test accuracy, but for soil whose strength is much smaller than rock body does not apply

The structure of the existing bored soil shear test devices at home and abroad is too complicated. After drilling, the test surface near the hole cannot be guaranteed to be absolutely flat and the test instrument is perpendicular to the hole axis. Moreover, the hole often collapses due to drilling reasons, resulting in failure. normal installation test

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