SU979634A1 - Composition for making simulators of equivalent material - Google Patents

Description

FIELD OF THE INVENTION The invention relates to subterranean / iy construction and mining production.

To assess the sustainability of mine workings and determine the rational parameters of radial underground structures, the method of equivalent materials is used. It is based on the fabrication of models of the rock massif with all the imexcimis in it with workings and fastening structures, and the subsequent study of the behavior of the models under load, reproducing the force field of the simulated object.

The composition of the equivalent material is known, containing a free-flowing filler of the type of sand with binders of various types: fusible substances, mineral in the burner, synthetic resins l.

The closest in technical essence and the achieved result to the proposed is a composition for the manufacture of models from an equivalent material, containing quartz sand, urea resin and oxalic acid 2. The disadvantage of these compositions is the impossibility of using them for

building volumetric models - due to the presence of water in the resin and catalyst, which is added in the form of aqueous solutions /

the release of water during the chemical curing reaction of the resin.

In bulk models, water cannot be completely removed from their thickness, which leads to material

10 does not reach the specified characteristics. In the process of natural drying of the models during the removal of formwork, complete dehydration of the mixture does not occur. Total dehydration can

15 to be achieved by chemical bonding of water. :

The purpose of the invention is to provide a south cost of dewatering the mixture at 20 manufacturing volumetric models.

This goal is achieved by the fact that the composition for the manufacture of models of equivalent material containing quartz sand, carbamide resin 25 and oxalic acid further comprises powdered cement in the following ratio of components, wt.%:

Claims (2)

Quartz sand 85,23-93,46 30 Urea resin 1.91-4.48 Oxalic acid 0.26-0.44 Cement4.35-9.85 Oxalic acid acts as a resin curing catalyst. The amount in relation to the resin was determined on the basis of the need to ensure the optimum cure rate of the resin. The urea resin is its own binder. Varying its amount in relation to sand allows obtaining a material with different strengths and deformations ha. characteristics to reproduce the properties of rocks of varying strength and vary the scale of modeling. Cement vigorously interacts with water, blends it together, thereby eliminating the need to dry the material. The dewatering process takes place simultaneously both on the external surfaces of the models and in their depth. The amount of cement is taken from the calculation of C / G 2, where C is the weight of cement, C is the weight of resin and oxalic acid solution. Quartz sand is the main filler material. The material production technology consists of the preparation of a sand-cement mixture, the creation of a bond, the final mixing of all components, and the consolidation of the mixture. Sand-cement mixture is prepared in the mixer. Then, in a separate container, a binder of carbamide resin is made, for example, mark M-19tb2, and an 8% solution of oxalic acid. Introduction of the binder into the sand-cement mixture is carried out with the mixer rotors in operation. The duration of the final mixing is 5. min. (In the Cf type mixer. The mixture is compacted by rolling with a roller transferring a load of 240 g / cm. The strength of the materials can be adjusted in makes it possible to imitate brittle mountain rocks on a modeling scale of from 1/50 to 1/500. The use of the proposed material makes it possible, by chemical bonding of water, to use cheap urea resin for the manufacture of bulk materials. It provides great opportunities for radiation deformation of rocks and lining with them in the preparatory and capital workings, on joints, in long clearing holes on steep falling layers. The presence of cement gives and There are a number of other advantages to the proposed material. In particular, the concentration-strength coefficient of the material decreases, which reduces the effect of random errors on the properties of EM when dosing the components. In addition, cement contributes to reducing the effect of environmental humidity on strength. The invention Composition for the manufacture of models of equivalent material, containing quartz sand, urea resin and oxalic acid, characterized in that, in order to ensure the possibility of dewatering the mixture in the manufacture of removable models, the composition additionally contains powdered cement in the following ratio of components, wt.% : Quartz sand 85,23-93,48 Urea. slit 1.91-4.48 Oxalic acid 0.26-0.44 Cement4.35-9.85 Sources of information taken into account during the examination 1.Glushikhin FP and Zlotnikov M.S. Equivalent material for modeling rock pressure. M., ZNIEIugol, 1979. 2. Zlotnikov MS Sand-carbamide material for the manufacture of models. Physico-technical problems of mining, 2, 1974, p. 34-38.