Undisturbed soil penetration test device and method for measuring permeability coefficient

Abstract

The invention discloses an undisturbed soil penetration test device and a method for measuring a permeability coefficient. The undisturbed soil penetration test device comprises a top cover and a base, wherein at least one specimen tube is arranged between the top cover and the base; the specimen tube is partitioned into an upper chamber and a lower chamber by a seepage plate arranged on the base; water via holes communicated with the outside are formed in the side wall of the upper part of the top cover with a seepage hole and the side wall of the lower chamber of the base; at least two accommodating grooves are formed in the top cover and the upper ends and the lower ends of the base and the specimen tube; installation cavities communicated with the accommodating grooves are formed in two sides of the accommodating grooves in the upper ends of the base and the specimen tube; and insertion parts sliding along the accommodating grooves are arranged in the accommodating grooves in the lower ends of the top cover and the specimen tube; and carrying parts which are paired with the insertion parts and clamp the insertion parts are arranged in the installation cavities of the base and the specimen tube.

Description

technical field [0001] The invention relates to a device for measuring soil permeability, in particular to an undisturbed soil permeability test device and a method for measuring permeability coefficient. Background technique [0002] In geotechnical engineering testing and application, soil penetration test devices generally adopt non-detachable structures, which are difficult to move in the laboratory, and are mainly used for fine-grained soil and disturbed soil samples; the common penetration test devices currently on the market include penetration Instruments, such as the 70-type permeameter and the Nan 55-type permeameter, are mainly aimed at fine-grained soils, and they are all remolded samples, which makes the test results quite different from the actual ones. [0003] Although some scholars have taken the undisturbed soil samples back to the laboratory, and then used the undisturbed samples to conduct the penetration test, the process of moving the undisturbed sample...

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Problems solved by technology

[0002] In geotechnical engineering testing and application, soil penetration test devices generally adopt non-detachable structures, which are difficult to move in the laboratory, and are mainly used for fine-grained soil and disturbed soil samples; the common penetration test devices currently on the market include penetration Instruments, such as the 70-type permeameter and the Nan 55-type permeameter, are mainly aimed at fine-grained soils, and they are all remolded samples, which makes the test results quite different from the actual ones.

[0003] Although some scholars have taken the undisturbed soil samples back to the laboratory, and then used the undisturbed samples to conduct the penetration test, the process of moving the undisturbed samples is redundant, and for soils with a relatively weak degree of cementation, it is slightly The disturbance can cause damage to the sample, and the test failure rate is high

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