Method and device for preparing aeolian sand mechanical test piece based on microorganisms

Abstract

The invention provides a method for preparing an aeolian sand mechanical test piece based on microorganisms. The method comprises the following steps: preparing a bacterial solution; sieving the aeolian sand; and sequentially injecting a fixing solution, a bacterial solution and a cementing liquid from bottom to top into the sieved aeolian sand so as to obtain an aeolian sand mechanical test piece. The invention further provides a device for preparing the aeolian sand mechanical test piece based on microorganisms, and the device is used for preparing the aeolian sand mechanical test piece. Themethod provided by the invention is simple and feasible, and can be used for effectively preparing the aeolian sand mechanical test piece. Meanwhile, the method can be further used for the quantitative evaluation of the microorganism reinforced aeolian sand effect. According to the method provided by the invention, a large number of effective attachment sites can be provided for microorganisms byfirstly injecting the fixing solution in the test piece preparation process, and then respectively injecting the bacterial solution and the cementing liquid. Therefore, the microbial activity is maximally exerted. Meanwhile, the sufficient reaction between microorganisms and peripheral chemical components is ensured. The cementing effect is improved, and the time required for cementing is shortened.

Description

Technical field [0001] The invention relates to the technical field of rock and soil body strength test sample preparation, in particular to a method and device for preparing aeolian sand mechanical test specimens based on microorganisms. Background technique [0002] Aeolian sand is widely distributed in the desert areas of northwest my country. Due to its small particles, no cohesion between particles, and poor gradation, it is not only difficult to directly provide assistance for desert area engineering construction, but it has even become the culprit of local air pollution problems. At present, there is a great demand for building materials in the development process in the western region of my country, and the transportation of building materials from the eastern region is expensive. Taking certain measures to reinforce aeolian sand and using it as a construction engineering material in engineering construction can not only alleviate environmental pollution problems to a cer...

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Problems solved by technology

However, this method has the disadvantage that it is difficult to fully stimulate the ability of microorganisms to produce urease without adding urea when cultivating microorganisms, which will have an important impact on the cementation effect; The grouting method of calcium mixed solution will inevitably cause blockage in the middle of the sand body, which is also not conducive to sand body consolidation

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