Undisturbed loess preferential flow dynamic observation device for CT scanning and method of use

Abstract

The invention discloses an undisturbed loess preferential flow dynamic observation device for CT scanning and a method of use. The loess is stored in a visual container of the device. A continuous fluid adding device continuously supplies liquid to a percolation chamber. During the gradual seepage of the loess, CT can clearly scan related parameters such as pore changes in the loess and seepage paths of the liquid. The device is simple in structure, convenient to mount and dismount, and high in automation degree. The method of using the device adopts advanced X-ray CT non-destructive testing technology to perform dynamic CT scanning on undisturbed loess samples in an undisturbed soil visual seepage device under continuous humidification conditions, and uses an AVIZO three-dimensional visual reconstruction platform to perform image processing, three-dimensional visual reconstruction, pore fracture characteristic analysis and preferential flow seepage path extraction on CT scanning results under dry wet conditions to obtain preferential seepage channels of the pore fracture and dynamic development rules of the preferential flow.

Description

【Technical field】 [0001] The invention belongs to the technical field of soil seepage experiments, and relates to an observation device for CT scanning of undisturbed loess preferential flow dynamics and a use method. 【Background technique】 [0002] Loess is an aeolian sediment in arid and semi-arid areas, with loose texture and obvious columnar joints and pores, which makes loess a special structural geological material, which directly affects the mechanical and hydraulic properties of loess . In addition, due to external factors such as animal and plant activities, freeze-thaw cycles, alternating wet and dry, hydrochemical dissolution, and physical submerged erosion during the formation of loess, large pores are generally developed in loess. [0003] The existence of large pores makes water infiltrate along it first and bypass most of the matrix particles in the process of infiltration, and reach the deep layer of soil in a short time in the form of preferential flow. Th...

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Problems solved by technology

Although there have been many studies on preferential flow of soil in CT, most of them are based on the quantification of static loess structure, using numerical simulation method to simulate preferential flow seepage, which is easy to ignore the soil pressure caused by the change of osmotic pressure in the seepage process. information such as the destruction of the body structure or the expansion and development of pores and fissures, so that the real seepage of the preferential flow in the pore and fissure structure cannot be revealed

At the same time, research on the dynamic seepage of preferential flow in loess with special structural pores and cracks is relatively lacking.

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