A rigid sample preparation mold for preparing microbial sand column samples by soaking method
A technology for making sample molds and microbes, which is applied in the field of geotechnical engineering, can solve problems such as low compressive strength, difficulty in removing molds, and non-standard shapes, and achieve the effects of convenient mold removal, high strength, and wide application range
Active Publication Date: 2022-08-02
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology
[0003] The purpose of the present invention is to provide a rigid sample preparation mold for preparing microbial sand column samples by immersion method, so as to solve the problems of low unconfined compressive strength, non-standard shape and poor sample preparation effect in the preparation of microbial consolidation sand samples by immersion method. Poor, difficult form removal, poor applicability to fine-grained sand
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[0028] First open holes and slits in the outer layer mold 1, and then use 304 stainless steel mesh to form two semi-cylindrical shapes and place them inside the outer layer mold 1, so that the first steel mesh 2-1 and the second steel mesh 2-2 are close to the outside. The inner wall of the layer mold 1 is used as the inner layer mold 2, and then a circular 304 stainless steel mesh is used as the lower sealing cover 2 with hot melt adhesive and the outer layer mold 1 is firmly glued. Mix the bacterial liquid containing Bacillus pasteuri with standard sand of different particle sizes, put it into the inner layer mold 2 several times, and compress it while pouring it. Finally, another round 304 stainless steel mesh is used as the upper sealing cover 3 to be firmly glued to the outer mold with hot melt adhesive. The outer layer mold 1 is made of PVC material with a thickness of 2mm and the diameter of the hole is 7mm. The inner layer mold 2 and the upper and lower sealing covers ...
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Abstract
The invention discloses a rigid sample preparation mold for preparing microbial sand column samples by soaking method, comprising an outer layer mold, an inner layer mold, an upper sealing cover and a lower sealing cover. The inner layer mold is located in the outer layer mold, and the upper The sealing cover and the lower sealing cover are respectively fixed on the upper end and the lower end of the outer layer mold, the outer layer mold is a hollow cylinder with a plurality of evenly arranged holes on its side wall, the inner layer mold is a net-shaped hollow cylinder, and the upper sealing Both the lid and the lower sealing lid are mesh discs. The invention has the advantages of convenient mold removal and wide application range, and at the same time, the final sample has a standard shape and high strength.
Description
technical field [0001] The invention relates to a mold for preparing microbial sand column samples, belonging to the technical field of geotechnical engineering. Background technique [0002] In the current study of microbial consolidation of loose sand, the unconfined compressive strength of the sample is an important evaluation index. Immersion is one of the current microbial-induced calcium carbonate deposition (MICP) techniques for consolidating loose sand. In the method, the loose sand is mixed with bacterial liquid in advance and placed in a sample preparation mold, and then the sample preparation mold is immersed in a cemented nutrient solution for natural reaction, thereby forming a consolidated body of microbial sand. However, in the current research on the reinforcement of loose sand by the immersion method MICP, the sample preparation mold used is a flexible mold made of geotextile. Although the geotextile can prevent the outflow of sand and bacteria, bacteria an...
Claims
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IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 邓雪杰李玉卢迪刘旭正赵逸乐王斐石孝明
Owner CHINA UNIV OF MINING & TECH (BEIJING)