Tilting testing device for measuring anisotropy of sliding friction angle of rock joint surface

Abstract

The invention relates to a tilting testing device for measuring the anisotropy of a sliding friction angle of a rock joint surface. The testing device consists of a base, a sliding rail, a hinge frame and a compass. According to the device, the shortcomings of the conventional sliding friction angle measurement of the rock joint surface are overcome; a lower disc of a rock joint surface test sample is fixedly arranged on the compass through a clamping threaded rod, and the compass is rotated in a testing process to continuously measure the anisotropic sliding friction angle of the disc-shaped rock joint surface test sample which consists of an upper disc and the lower disc along any sliding direction and reutilize the test sample; and the upper and lower discs of the rock joint surface slide relative to each other by slowly enlarging a tilting angle of a flat plate, and the tilting angle of the flat plate is read through an angulometer in real time, so that a value of the sliding friction angle of the rock joint surface can be directly obtained.

Description

technical field [0001] The invention relates to a measuring device for the sliding friction angle of a rock joint surface, and more particularly to an inclination test device for measuring the anisotropic sliding friction angle of a rock joint surface in different sliding directions. Background technique [0002] The continental crust has experienced many large-scale internal dynamic tectonic processes in the Indosinian, Yanshanian, Himalayan, and Neotectonic periods in history. The crustal rock mass generally develops a large number of joint formations of different scales due to strong compression or tension structures. For example, my country's Ertan Hydropower Station, Xiaolangdi Project, the high slope of the Three Gorges permanent ship lock, the underground powerhouse of the Jinping II Hydropower Station, and the dam area slope of the Baihetan Hydropower Station, etc., can all see a large number of outcropping rock joints. Engineering practice shows that the existence of...

AI Technical Summary

Problems solved by technology

[0004] (1) The existing friction angle measurement device cannot measure the friction angle of any sliding azimuth angle: most of the existing equipment and instruments for measuring the friction coefficient of materials are developed for a single block or granular body, so such equipment and instruments During the test, the relative sliding characteristics of the joint upper plate and the lower plate along any azimuth angle with non-uniform surface morphology were not considered, so that the measurement of the anisotropic friction angle of the joint surface could not be realized

Chinese Patent Publication No. CN 1699963 A, publication date 2005.11.23, the invention name is "non-particulate material friction angle measuring instrument", the application realizes the measurement of non-particulate material by installing a rotating shaft on a symmetrical bracket fixed on the support table. The friction angle and critical slope measurement of granular materials, but the anisotropic friction angle measurement of the material cannot be considered, and it is not suitable for the measurement of the friction angle of rock mass joints with upper wall and lower wall structures; Chinese Patent Publication No. CN 102878910 A, published On January 16, 2013, the title of the invention is "Incline Meter Device for Measuring the Friction Angle and Friction Coefficient of Granular Materials". It realizes the measurement of friction angle and friction coefficient of granular materials, but it cannot measure plate materials with anisotropic friction angle characteristics.

[0005] (2) Some anisotropic analysis methods of joint surfaces cannot directly give the anisotropic sliding friction angle of joint surfaces: some anisotropic analysis methods of rock / rock mass joint surfaces use surface topography measurement equipment to analyze the surface angle of joint surfaces. The two-dimensional undulation shape, although it has been confirmed from the perspective of structural characteristics that the characteristics of the rock joint surface and the degree of undulation are anisotropic, it cannot directly give the anisotropic sliding friction angle of the joint surface with mechanical significance

"Journal of Geomechanics", No. 2, 2001, titled "Study on the Anisotropy of Rock Mass Joint Surface Topography", author Zhou Hongwei, this study proposes to use the laser surface measurement data of the joint surface topography to obtain the joint surface indirectly Anisotropy, but can not directly measure the friction angle anisotropy characteristics of joint surfaces; Chinese Patent Publication No. CN 101055175 A, publication date 2007.10.17, invention name "simple measurement method for roughness coefficient of rock mass structural surface", the application The roughness coefficient of the rock mass structural surface / joint surface can be obtained by measuring the convex tooth amplitude of the surface profile curve of the rock structural surface, but it is impossible to directly measure the sliding friction angle of the same joint sample under different azimuth angles

[0006] (3) Some calculation and test methods for the anisotropic strength of rock mass fail to fully consider the fact that the sliding of the joint surface is the relative motion of two planes: usually the anisotropic effect of the joint surface is integrated into the anisotropic characteristics of the rock mass The calculation and testing method of the method ignores the difference in the spatial occurrence of the joint surface with planar characteristics in the rock mass, and fails to consider that the sliding friction angle of the joint surface depends on the characteristics of the relative motion of the hanging wall and the footwall of the joint, so it cannot directly gives the sliding friction angle for any sliding azimuth

"Journal of Rock Mechanics and Engineering", No. 5, 2007, titled "Study on Physical Simulation and Ultrasonic Test of Jointed Rock Mass", author Han Song, this research was conducted indirectly by analyzing the ultrasonic wave velocity test at different incident angles relative to the joint surface Reflect the anisotropy of the rock mass, but the sliding friction angle of the joint surface of the rock mass cannot be obtained

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