Sandstone similar material based on freeze-thaw cycle model tests and preparation method thereof

Abstract

The invention relates to a sandstone similar material based on freeze-thaw cycle model tests and a preparation method thereof. The sandstone similar material comprises, by weight, 186-280 parts of anaggregate, 213-225 parts of a bonding agent and 86-89 parts of water; the aggregate comprises, by weight, 158-278 parts of standard river sand, 0-35 parts of 40-80 mesh pottery sand, 0-42 parts of 32-40 mesh pottery sand, and 0-28 parts of 20-32 mesh pottery sand; the bonding agent adopted in the aggregate is prepared by mixing 21-68 parts of plaster and 149-203 parts of cement. The preparation method of the sandstone similar material includes the step that according to the proportion, the cement, the plaster, the river sand and the distilled water are weighed and then placed into a containerto be evenly stirred. By adopting the sandstone similar material, freezing resistance of sandstone can be well simulated; according to the sandstone similar material, a mixture of the plaster and thecement serves as the bonding agent; the mixture of the plaster and the cement has the advantages of having high bonding capability, stable properties, a high adjustable degree and the like, after themixture of the plaster and the cement serves as the bonding agent to be mixed with the aggregate, the similar material which is compact, uniform and stable in physical and mechanical property is obtained, and thus properties of the similar material coincide with those of sandstone.

Description

technical field [0001] The invention relates to the technical field of model-like materials, in particular to a sandstone-like material based on a freeze-thaw cycle model test and a preparation method thereof. Background technique [0002] Traditional geotechnical engineering The area of ​​cold regions in my country ranks third in the world. About 75% of the country’s land area is frozen in winter and thawed in summer, and the cycle of freezing at night and thawing at the turn of spring and summer. The development of resources in cold regions, the process of engineering construction and the service During the period, the problem of freeze-thaw disasters in rock mass engineering was not uncommon. A large number of engineering examples in cold regions showed that although the freeze-thaw cycle affected the depth of slope rock mass to a limited extent, it would induce local landslides and collapses, and cause a wider range of slope damage due to chain reactions. In addition, the ...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of sandstone similar material based on freeze-thaw cycle model test and preparation method thereof, to solve the present sandstone similar material model test proposed in the above-mentioned background technology is mostly developed for other similar properties of rock, for rock There are not many similar materials with similar frost resistance, and only the mechanical properties similar to those before freezing and thawing are considered. The physical and mechanical properties after freezing and thawing are not compared with the original rock. However, during the freezing and thawing cycle of rocks, due to The thermal expansion coefficients of the sandstone mineral particles are different. When the temperature decreases or increases, the shrinkage and expansion of the minerals in the rock will be different under the action of the crack water and pore water in the rock. During the freeze-thaw cycle test, it is necessary to simulate both before and after freezing and thawing according to the physical and mechanical properties of the original rock.

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