Method for generating karst cave by dissolving PVA thin shell applied to geotechnical engineering experiments
A geotechnical engineering and karst cave technology, which is applied in the field of PVA thin shell dissolution to generate karst caves in geotechnical engineering experiments, can solve the problems of reducing the cost of model printing and not being better.
Pending Publication Date: 2020-10-20
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology
This method has the disadvantage of not being able to drain the water body and fill it with various fillers, and also has the disadvantage of not using a thin shell model instead of a solid model to reduce the cost of model printing
[0006] In the model test, there is no better method for making caves with filling properties, so there is an urgent need for a relatively complete method for preparing rock mass samples containing caves
Method used
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Embodiment 1
[0054] In a typical implementation of the present application, such as figure 1 shown, including:
[0055] 1. Select water-soluble polyvinyl alcohol raw materials suitable for printing caves, as raw materials for printing caves, such as room temperature soluble water-soluble polyvinyl alcohol with a degree of alcoholysis between 75-78;
[0056] 2. According to the test requirements, determine the size of the sample, based on the results of the three-dimensional scanning of the cave, and according to the geometric similarity ratio, draw the three-dimensional digital model of the cave required for the experiment in advance in the three-dimensional drawing software, that is, the hollow cave model 2; The drawing of the cave model can use CATIA, SolidWorks and other software;
[0057] 3. Carry out solid cave construction through mold construction or 3D printing. When printing caves, the above-mentioned raw materials are melted and placed in the nozzles of the 3D printer, and the ...
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Abstract
The invention discloses a method for generating a karst cave by dissolving a PVA thin shell applied to geotechnical engineering experiments. The method comprises the following steps: determining the size of a sample according to experimental requirements, and constructing a solid model by using a water-soluble polyvinyl alcohol material to form a preliminary thin-shell sample of a karst cave; connecting pipelines into reserved holes in the positions, close to the top and the bottom, of the karst cave model; preparing a rock mass similar material mixture according to a proportioning scheme; paving and tamping the mixture layer by layer, and embedding the karst cave model into the mixed material in advance; after the rock similar material is hardened, injecting water into the sample througha pipeline at the top of the karst cave sample to be dissolved, and discharging water from a pipeline at the bottom after reaching the saturation degree; circularly injecting and draining water untilthe model is completely dissolved to form a hollow karst cave; adding fillers into the hollow karst cave to form different types of karst cave samples; and taking out the pipeline and carrying out plugging to form a complete rock sample with the karst cave. The method can be used for preparing rock samples containing irregular karst caves.
Description
technical field [0001] The invention relates to the technical field related to civil engineering experiments, in particular to a method for forming karst caves by dissolving a PVA thin shell applied to geotechnical engineering experiments. Background technique [0002] With the urgent need for the development and utilization of underground space, more and more underground buildings and structures are being built in Southwest my country. Karst is widely distributed in Southwest my country, so karst caves have become common geological disasters in the process of underground engineering development and construction. The integrity and continuity of the rock mass are destroyed due to the existence of caves, and the strength and stability are greatly reduced. At the same time, due to the difference in the spatial geometry of the cave, the nature and filling amount of the filling, and the spatial topological relationship, there are obvious differences in the strength, stress distr...
Claims
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Login to View More IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor吴冰鑫陈俊生翟利华史海欧林琛王一兆陈仕洪
OwnerSOUTH CHINA UNIV OF TECH