Sample preparation device for calcareous sand test

Abstract

The invention provides a sample preparation device for a calcareous sand test. The sample preparation device comprises a cylindrical soil body, a cementing liquid adding mechanism, a calcareous sand screening mechanism and an upper computer, wherein the cylindrical soil body is internally provided with a raw material cavity, a calcareous sand particle conveying mechanism comprises a baffle and a conveying belt, and the calcareous sand screening mechanism comprises a lifting plate, a first electric push rod, a material pushing plate and a second electric push rod; when the conveying belt conveys calcareous sand particles below the lifting plate, the calcareous sand particles can penetrate through the passing cavity, the height of the passing cavity is changed by adjusting the height of the lifting plate, and therefore large-particle calcareous sand can be intercepted and prevented from entering the raw material cavity; after adding microbial cementing fluid to the calcareous sand through a cementing fluid adding mechanism, the calcareous sand sample can be manufactured, large-particle calcareous sand is removed, so large deviation of the calcareous sand sample during subsequent mechanical property test can be avoided, test errors are reduced, and a theoretical basis is provided for application of the calcareous sand in the South China Sea ocean engineering.

Description

technical field [0001] The invention relates to the technical field of marine rock and soil material testing, in particular to a sample preparation device for calcareous sand testing. Background technique [0002] Calcareous sand is a CaCo 3 More than 50% of the special soil of marine biogenesis, from the perspective of microstructure, has large intergranular porosity and internal pores. These internal pores are interconnected or called blind pores. The special depositional environment makes calcareous sand have It is easy to break, high compressibility and low strength. Therefore, when using calcareous sand as raw material for marine engineering construction, it needs to be reinforced. Since calcareous sand is different from traditional construction materials, it is necessary to strengthen the calcareous sand. Carry out performance tests on calcareous sand to check the shear and compressive properties of calcareous sand. [0003] At present, the commonly used new calcareo...

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Problems solved by technology

[0003] At present, the commonly used new calcareous sand reinforcement technology is Microbe induced calcium carbonate deposition (MICP for short), which has better durability and less energy consumption than traditional cement reinforcement and gypsum reinforcement. The cost is low, so MICP is widely used. Before the mechanical performance test of calcareous sand, it is necessary to make samples. At present, the production of calcareous sand samples is basically to pour calcareous sand into the mold and add cement. However, since calcareous sands of different sizes have different internal pore depths and quantities, the data obtained by mixing calcareous sand particles of different sizes for sample preparation and testing will be quite different. There is no guarantee that the obtained data will be used for practical guidance. For example, a calcareous sand hollow cylinder sample in-situ solidification sample preparation instrument and sample preparation method with a publication number of CN112683630A and a microbial solidification sand sample preparation device with a publication number of CN209878442U The sample preparation process shown does not consider the size of calcareous sand particles, and the prepared calcareous sand samples are prone to differences in mechanical performance tests, which cannot provide a theoretical basis for marine engineering construction

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