Method for fabricating coupling shear specimen containing natural structure surface

Abstract

The invention discloses a method for fabricating a coupling shear specimen containing a natural structure surface, and belongs to the field of rock structure surface test research. The method comprises the following steps of scanning a natural surface of a rock body employing a three-dimensional white-light scanning instrument to obtain point cloud data of the natural structure surface; fabricating a virtual three-dimensional model containing the natural structure surface from the obtained point cloud data employing inverse engineering software; printing an entity die from the generated virtual three-dimensional model through a 3D printer, then putting the printed die into a standard cast iron test die and carrying out shearing specimen fabrication. The method can be used for repeatedly fabricating the coupling shear specimens which are completely consistent in form and contain natural structure surfaces, and is of great significance in research of the shear destruction mechanism of the natural structure surface of the rock body.

Description

technical field [0001] The present invention relates to a method for making a coupled shear sample with a natural structure plane, more particularly to a method for making a coupled shear sample with a similar material in the shape of a rock mass structure plane, which can be used to repeatedly make the surface shape and rock mass The shear sample with the same natural structural plane of the rock is provided to provide a shear specimen with the hanging wall and the footwall completely consistent for the shear test research of the natural structural plane of the rock. Background technique [0002] The rock mass on the earth's surface has experienced geological tectonic effects such as stretching, extrusion, and rotation repeated many times in history, and there are a large number of interlaced rock mass structural planes inside. The natural structural planes in these rock masses obviously deteriorate the integrity of the rock mass, reducing its mechanical strength and stabil...

AI Technical Summary

Problems solved by technology

However, the existing technical reserves related to the production of shear specimens with natural structural planes are obviously lacking:

[0004](1) Usually, some fabrication techniques and researches of shear specimens with structural planes focus on artificial mold manufacturing methods with structural plane shapes, without careful consideration of how to Realize close contact between the test block of the upper wall of the structure and the test block of the lower wall

"Rock and Soil Mechanics", No. 4, 2013, titled "Study on Reverse Control Technology for Making Similar Surface Models of Series-Scale Rock Structural Surfaces", author Huang Man et al. developed series-scale sample molds for structural surfaces and footwalls, However, since the upper plate and the lower plate are independently produced, the temperature and artificial errors in the solidification process of similar materials will not be able to ensure that the samples with structural surfaces combined by the final upper and lower plates are completely consistent; Chinese Patent Publication No. CN103645081A, published On March 19, 2014, the name of the invention is "A Sawtooth Structural Surface Sample Making Mold with Adjustable Angle and Size". However, no reliable technology has been proposed to achieve a close fit between the upper wall test block and the lower wall test block of the rock mass structure; Chinese Patent Publication No. CN103674646A, publication date 2014.03.26, the title of the invention is "a sample making mold with controllable undulations structure surface", the application relates to a method of making molds for samples with controllable undulations structure surface, but Sufficient technical means are not proposed to realize the complete coupling between the test block of the upper wall with structure and the test block of the lower wall

[0005](2) Some other studies involving structural surface samples of rock masses focus on the research of similar materials and the analysis of shear mechanical properties, without special consideration of the structural surface plate and The height matching technology of the footwall, so that the complete coupling between the hanging wall test block and the footwall test block of the rock mass structural plane shear specimen cannot be reliably ensured

"Journal of Rock Mechanics and Engineering", No. 7, 2008, titled "Research on shear deformation characteristics and failure mechanism of simulated rock joint specimens", author Li Haibo et al. This research is based on steel plate molds and artificially poured plain concrete joint specimens. Shear tests under different shear deformation rates, normal stresses and heaving angles have been carried out, and there are obvious pores in the prepared samples, which obviously cannot realize the complete coupling of the upper wall and the lower wall; Chinese Patent Publication No. CN101718644A, published on 2009.12.07, the name of the invention is "a method for making structural surface model of direct shear test". However, because the isolation film has a certain thickness, it is impossible to ensure that the convex or concave structural surface points between the upper plate test block and the lower plate test block are completely consistent; Chinese Patent Publication No. CN101717224A, publication date 2010.06. 02. The title of the invention is "Direct Shear Test Structural Surface Simulation Rock and Manufacturing Process". This application proposes a structural surface simulation rock material including sand, cement, water, silica fume and water reducer, but does not clarify its structural surface Coupling technology of hanging wall and footwall; "Rock and Soil Mechanics", No. 11, 2010, entitled "Research on Similar Materials in Prototype Test of Rock Structural Surface Mechanics", author Du Shigui et al. The simulated material is mixed with raw materials such as agent, standard sand, water, etc., and a large number of physical and mechanical tests are carried out by using the prepared sample and structural surface model. coincides with the footwall; "Journal of Rock Mechanics and Engineering", No. 4, 2010, titled "Model Test Research on Shear Characteristics of Regular Tooth Structure Surface", author Shen Mingrong et al. The shear test under the vertical stress, the basic research on its mechanical properties, proposed the method of layered feeding and layered compaction in the process of sample production, but also failed to propose effective technical means to realize the upper wall and the lower wall. fully coupled

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