Compaction-method triaxial sample preparation device and method

Abstract

The invention relates to a compaction-method triaxial sample preparation device and method. The compaction-method triaxial sample preparation device comprises a fixing frame, a power providing deviceand a sample-compaction device which are fixed to the base. The power providing device comprises a transmission wheel, an upper driven wheel and a lower driven wheel which are connected into a whole through a transmission belt, wherein the transmission wheel is provided with a rocking handle. A lifting rod is fixedly connected to the transmission belt. The sample-compaction device comprises a sample-compaction cylinder, a guide rod and a compaction hammer. The lower end of the guide rod sequentially penetrates through a positioning ring located above the sample-compaction cylinder and the compaction hammer to be connected with a hammer seat, and the upper end of the guide rod penetrates through the center of a guide rod fixing plate located at a cantilever of a fixing frame top plate. Thepositioning ring can be connected with the guide rod and the lifting rod in a contact mode. According to the compaction-method triaxial sample preparation device and method, the falling process of thecompaction hammer can approximate to free falling, the falling height of each time is consistent, the defects that in the prior art, the guide rod is inclined and the compaction processes of all thelayers are uneven are eliminated, the evenness of samples is improved, and meanwhile, the sample preparation process is more reliable, more convenient and rapider.

Description

technical field [0001] The invention relates to geotechnical test equipment and a method, in particular to a device and a method for preparing a disturbed soil triaxial sample. Background technique [0002] The triaxial test is a common method for testing the mechanical properties of soil. The sample preparation includes the steps of taking soil, air-drying, rolling, sieving, mixing soil, and sample preparation, among which sample preparation is the key link. The recommended preparation method for triaxial samples in the existing regulations is the layered compaction method, that is, the soil sample is compacted in five layers in the compaction cylinder with a hammer equipped with a compaction plate; after the last layer is compacted , the two ends of the sample in the compaction cylinder are leveled to complete the sample preparation. Since the compaction of each layer of soil samples is manually operated, the operator’s hand fatigue is prone to occur during the compaction...

AI Technical Summary

Problems solved by technology

Although the device can drive the lower hammer to freely fall for sampling through the gear and rack mechanism, it reduces the friction between the sample and the sample preparation mold, and partially solves the problem of uneven compaction force on each layer during the sample making process. problem, but the friction between the gear and the rack used is relatively large, especially when the hammer is facing downward for free-fall proofing, the friction between the above-mentioned gear and the rack will undoubtedly affect the free-fall process of the hammer , or even interrupt the free fall process, which not only affects the accuracy and reliability of the test data, but also requires timely maintenance of the device, especially the rack and pinion mechanism

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