Method for preparing fractured rock mass samples with filler

Abstract

The invention discloses a method for preparing a rock mass sample with filling fissures. model, and input the three-dimensional digital model into the 3D printer; (2) simulate the actual fractured rock mass to prepare the rock block part for forming the sample and the raw materials for the crack filling, and use water-soluble materials as raw materials to form the sample The above three raw materials were placed in different nozzles of the 3D printer, and a preliminary sample containing the filling was obtained by 3D printing; (3) The preliminary sample was soaked in water to completely dissolve the water-soluble material to obtain final sample. The invention does not need to use a mold to prepare the sample, and the prepared sample contains fillers, which overcomes the defect in the prior art that powdery solid particles cannot be filled into cracks of the sample to form fillers.

Description

Technical field [0001] The invention relates to a method for preparing a rock mass sample, in particular to a method for preparing a rock mass sample containing filling fractures. Background technique [0002] Fractured rock mass is a medium often encountered in engineering. The main difference between fractured rock mass and intact rock is that the fractured rock mass contains more structural surfaces, and the mechanical properties of the fractured rock mass are mainly controlled by these structural surfaces. Test is a research method often used in the field of rock mechanics. However, because of the variability of the geometric properties of natural fractured rock masses, the fissures of different rock masses are very different. The rock mass samples taken from natural fractured rock masses are not representative, and the site The experimental working conditions are complicated and the investment is large. Therefore, the mechanical properties of fractured rock masses are usual...

AI Technical Summary

Problems solved by technology

[0004] 1. In the Chinese utility model patent "Combined Three-dimensional Fractured Rock Sample Mold" with the patent number of 201520131517.4, a three-dimensional fractured rock sample preparation mold is disclosed. The composition of the adjustment device; when making rock samples of different shapes and geometric sizes, it is necessary to make new molds, which is time-consuming and labor-intensive, and the cost is high;

[0005] 2. In the Chinese invention patent application with the application number of 201410052815.4 "A Method for Making Randomly Cracked Rock Samples", a method of mixing tin bars and mortar materials, and turning the tin bars into powder at low temperature to form cracks and cracks is disclosed. The preparation method of random fractured rock samples; the fractured rock samples produced by this method cannot control the size, spatial shape, quantity and distribution of cracks, and cannot meet the test requirements;

[0006] 3. In the Chinese invention patent application with the application number of 201510101177.5 "Method for making rock sample model for intermittently filling cracks", it is disclosed that a thin slice material for simulating cracks is fixed in a sample preparation mold with a water solubility line, and then the mixed material Pour layer by layer into the sample mold coated with release agent, take it out of the mold after heating to obtain a method for making a rock sample model with intermittent filling of cracks; using this method to make rock sample cracks is relatively simple, and cracks containing complex cracks cannot be made Rock mass, and its fissure filling is a thin slice simulation material, which is inconsistent with the actual fissure filling. After the rock sample is made, it is easy to cause damage to the rock mass during the demoulding process, which will have an uncontrollable impact on the sample results.

[0007] In summary, the current methods for preparing fractured rock mass samples generally have the following problems: when the size of the rock mass is changed, new molds need to be manufactured, they are not flexible enough, they cannot effectively control the shape and distribution of cracks, they cause damage to cracks when demoulding, and they cannot be constructed. Therefore, there is an urgent need for a relatively complete method for preparing fractured rock mass samples.

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