Device and method for measuring permeability coefficient of cement-soil

Abstract

The invention discloses a device and a method for measuring a permeability coefficient of cement-soil. The device comprises a variable cross-section transparent organic glass tube (1), and an adapter (2) for connecting the variable cross-section transparent organic glass tube (1) with a sample (3), wherein the lower end of the adapter (2) is arranged in a rubber membrane (4) in a sleeving manner to be connected with the sample (3), the gap between the adapter (2) and the rubber membrane (4) is tightened by utilizing a rubber seal ring (8), a permeable stone (5) and a permeable stone (6) are arranged at the upper end and the lower end of the sample (3), and the device is placed in a water tank (9). The device and the method provided by the invention have the advantages of simple operation, cheapness in fabrication and stronger applicability.

Description

technical field [0001] The invention relates to the field of performance testing of underground engineering materials, in particular to a device and method for measuring cement-soil permeability coefficient. Background technique [0002] The cementation and ion exchange between cement hydration products and soil particles reduce the dispersion of soil particles, reduce the pores, and greatly improve the strength and impermeability of the soil. Therefore, cement-soil mixing piles have been widely used in anti-seepage projects such as deep foundation pit water-stop curtains, earth dams and flood embankments in recent years. However, due to different construction methods and soil properties, the impermeability of cement-soil varies greatly. Since the anti-seepage performance of cement-soil is directly related to the safe construction of anti-seepage engineering, the determination of the permeability coefficient of cement-soil is an indispensable work. [0003] After searching...

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Problems solved by technology

[0003] After searching the existing domestic literature on the determination method of cement-soil permeability coefficient, the applicant Anhui Academy of Hydraulic Sciences (patent publication number is CN101603913B) invented a method that uses a pressure chamber to apply back pressure to the sample to provide water head pressure to measure cement-soil. The device and method of the permeability coefficient, but the processing cost of the device is very expensive, and once the device is processed, it can only be used to measure the permeability coefficient of a cement-soil sample of a certain size. vary in size, so this device is not very versatile

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