A kind of porous rock sample production mold and production method

Abstract

The invention belongs to the technical field of a rock specimen and preparation thereof, and relates to a pore type rock specimen manufacturing mold and a manufacturing method. Screw bolt holes are respectively formed in the peripheries of the upper and lower end openings of a mold body, a lower bottom plate and a movable upper bottom plate in the peripheral direction; each part of the mold realizes the mutual connection and fixation through screw bolt anchoring matched with the screw bolt holes to be used; the demolding of a prefabricated specimen is convenient; holes in uniform distribution at equal intervals are respectively formed in the mold body, the lower bottom plate and the movable upper bottom plate; the adjacent hole space is set according to practical requirements; the cost is low; the operation is simple; the making period is short; the mass production can be realized; the prefabricated rock-like pores have the advantages of adjustable length, adjustable angle and variable diameter; the pore positioning is accurate; the pore parameters can be conveniently calculated; the powerful basis is provided for the porous rock specimen mechanical study.

Description

Technical field: [0001] The invention belongs to the technical field of rock-like samples and preparation thereof, and relates to a mold and a manufacturing method for making rock-like samples with pores in different shapes. Background technique: [0002] Natural rock mass has characteristics such as pores and fissures, which have an important impact on the mechanical properties of rock mass. Experimental research on rocks with pores is one of the important research directions in rock mechanics. In order to obtain rock samples with preset pores and study the influence of pore shape on rock mechanical properties, a method of artificially prefabricating rock and rock-like samples with cracks and pores has been proposed. At present, there are several methods for prefabricating the cracks and pores of rock and rock-like samples: one is the through-hole and cutting method. The through-hole and cutting method is to make a real sample with transparent pores. The method of drilling...

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Problems solved by technology

At present, there are several methods for prefabricating the cracks and pores of rock and rock-like samples: one is the through-hole and cutting method. The through-hole and cutting method is to make a real sample with transparent pores. The method of drilling or cutting real rock samples can obtain samples with pores and cracks based on real rocks, but this method will affect the original mechanical characteristics of rock samples while processing pores, and because of its The strength of the equipment required for cutting is relatively high, and the shape of pores and cracks is relatively simple, so the shortcomings of this method are highlighted; the second is the pre-embedding method, which uses rock-like materials, such as gypsum, cement, mortar, etc. Plasticized materials are prepared in a certain proportion to simulate rock materials, and materials with obvious strength differences are embedded in the plasticization process to simulate rock joints or cracks. This method can be used without secondary impact on rock samples. Make rock-like samples that are discontinuous in strength, and conduct triaxial and uniaxial mechanical tests on the samples, but this method can only produce rock samples that are similar in strength to cracks and cannot reserve pores for rock sample permeability research, so this method still has deficiencies in the study of the influence of permeability on rock mechanical properties; the third is the insert method, Chinese patent CN105806687. The width of the fissure is staggered by the circular positioning plate, and the angle of the prefabricated gap and the long thin steel sheet can be adjusted by rotating the circular positioning plate, so that a crack with controllable angle and position can be obtained, but the thin steel sheet is difficult to obtain without special treatment. After the material is plasticized, it will inevitably lead to changes in the shape of the cracks, which will affect the accuracy of the prefabricated cracks. Moreover, this method produces surface cracks similar to rock samples, and it is difficult to reserve through-holes inside the rock samples.

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