A Soft Rock Shear Rheometer

Abstract

A soft rock shear rheometer. The upper end of the left shear box is equipped with a CCD chip holder and a bracket. A light barrier is connected between the CCD chip holder and the bracket. The light barrier is connected to the right shear box. The top of the right shear box passes through The lever is connected to the lever system bracket through the fulcrum of the lever system. The front end of the lever is connected to the weight through a movable sliding sleeve. One side of the right shear box is connected to the metal partition through a small pulley. The metal partition is connected to the jack to apply a horizontal axis to the test rock sample. Shearing force in the vertical and vertical directions causes the sample to undergo shear deformation, and the light shield will move relative to the visible light source and CCD of the left shearing box, thus changing the position of the light irradiated through the square hole on the CCD. , through the signal acquisition circuit, the CCD output signal is obtained, which can measure the shear deformation of the rock sample. It has the characteristics of simple structure, low cost, stable shear force, high deformation measurement accuracy and easy automatic detection and recording; suitable for Shear rheological test of soft rock, weak interlayer or soil.

Description

technical field [0001] The invention relates to a shear rheological test device for soft rock, in particular to a soft rock shear rheometer. Background technique [0002] As the saying goes, "everything flows". With the development of material mechanics and damage mechanics, the deformation characteristics of various materials over time have attracted more and more attention. In the field of geotechnical engineering, the rheological properties of rock mass have a significant impact on the long-term safety and stability of some major projects. Due to their structural characteristics, soft rocks and weak interlayers have obvious rheological effects, which play a decisive role in the stability of high and steep mine slopes with weak interlayers, reservoir dams, reservoir bank slopes, and tunnels. Therefore, it is particularly important to carry out shear rheological tests on soft rocks or weak interlayers, which also promotes the development of shear rheological instruments. ...

AI Technical Summary

Problems solved by technology

The subjective factors of micrometer readings are too influential, and automatic collection cannot be carried out, so it is not suitable for occasions with long creep time; while using displacement strain gauges, the test results are affected by too many interference factors, such as the position and distribution of strain gauges methods, etc., and is greatly affected by the defects of the rock sample itself

In addition, for shear creep experiments, the stability of the applied graded shear stress in the long-term creep deformation process is particularly important. Existing instruments mostly use servo loading methods or energy storage methods for stress compensation. , although these methods have high precision, but the structure is complex and the cost is high

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