Manufacturing method of simulation fracture for fractured rock mass seepage test

Abstract

The invention discloses a manufacturing method of a simulation fracture for a fractured rock mass seepage test. The manufacturing method comprises the steps of drawing a fracture digitized profile curve, constructing a fracture three-dimensional model, making a fracture plate through 3D (three-dimensional) printing, making a fracture test piece casting model and performing casting and maintenance of a fracture test piece, specifically, through digitizing a rock structural surface joint roughness profile curve, drawing the fracture three-dimensional model on the basis of CAD (Computer Aided Design) software, making the fracture plate satisfying JRC value fluctuation by adopting a 3D printing technology, making the fracture test piece casting model by combining the fracture test piece, forming by using cement mortar to cast, and making the fracture test piece by performing maintenance in a cement test piece maintenance box for 28 days. The manufacturing method has the beneficial effects: the manufacturing method of rock rough fracture analogue simulation which is easy in observing, simple in manufacturing, convenient in testing, convenient for adjusting fracture opening, and capable of truly and accurately reflect rock mass fracture structural surface roughness is provided, the working procedures are simple and clear, the manufacturing duration is short, economy and efficiency are realized, the accuracy is high, and the adaptability is good.

Description

technical field [0001] The invention relates to a method for making a simulated crack, in particular to a method for making a simulated crack for a seepage test of a cracked rock mass, and belongs to the technical field of civil engineering. Background technique [0002] With the commencement of construction of a series of large-scale super-large hydropower projects (such as Xiaowan Hydropower Station, Jinping I Hydropower Station, II Hydropower Station, Wudongde Hydropower Station) and other projects in recent years, the construction of deep tunnel projects has attracted widespread attention. The data show that these underground hydropower tunnels that have been built or are under construction have the characteristics of long progress, large embedding depth, complex ground stress conditions, and large seepage pressure difference. This trend also appears. [0003] With the expansion of underground mining and engineering construction scale, the seepage damage disaster of fra...

AI Technical Summary

Problems solved by technology

In actual engineering, due to the complexity of the cracks in deep-buried rock mass and the limited actual test conditions, it is difficult to directly sample samples from deep-buried rock mass for testing and the sampling cost is high. There is still a certain gap between the simulated conditions of the fracture seepage conditions that have been carried out and the actual situation. If the crack test specimens that meet the requirements of crack roughness and crack opening can be produced according to the distribution characteristics of the rock mass rock structure surface, it will definitely Provide greater convenience for the development of the test, and provide strong support for the study of seepage in rough fractures of rock mass

[0005] At present, in the experimental research of rock mass fissure seepage, the test specimens used by researchers are generally simplified, including using a simple smooth plexiglass plate to simulate the crack wall, or pasting sand grains on a smooth glass plate to simulate roughness. The crack wall surface is either a crack surface with undulating shapes such as triangles, rectangles, trapezoids, and sinusoidal curves through milling with steel plates and plexiglass plates, or a random crack surface obtained by sampling cores and then randomly splitting them. There is a large gap between the simulation method of the fracture surface and the actual engineering, which is not enough to fully and accurately reflect the characteristics of the fractured structural surface of the rock mass, so there is a gap between the test simulation results and the actual seepage characteristics

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