Device for rapidly and uniformly preparing triaxial test soil sample and method thereof

Abstract

The invention discloses a device for rapidly and uniformly preparing triaxial test soil samples and method thereof. The device comprises a consolidation forming cylinder, a consolidation forming cylinder upper cover plate, a consolidation forming cylinder base, a piston rod, a piston plate, rigid screws, bolts, and a drainage tube, and also is provided with a silica gel air bag, a pneumatic threaded joint, a positioner, and an air tube. The consolidation forming cylinder is made of microporous steel wire mesh, so that water can be drained.; Drainage holes are arranged on the consolidation forming cylinder base. Drainage holes are formed in the piston plate and the piston rod, so that water can be drained up and down and can be drained around the periphery when the soil sample is prepared.The positioner is arranged on the piston rod to control the prepared soil sample height, so that the prepared soil sample density is controlled. The silica gel air bag is placed in the consolidation cylinder, connected with the pneumatic threaded joint on the upper cover plate, and the silica gel air bag is expanded and compressed by an air compressor to compress the soil sample downwards, the pressure is constant, and the sample is uniform. According to the device for rapidly and uniformly preparing triaxial test soil samples and method thereof, the device is applicable to all kinds of soil,triaxial test soil samples can be prepared uniformly and rapidly, and the prepared soil sample can be applied to triaxial compression and shearing tests.

Description

technical field [0001] The invention relates to a preparation device for preparing triaxial test soil samples, in particular to a sample preparation device capable of rapid and uniform drainage, constant pressure, and uniform density, hardness and stress of the prepared soil samples and its use method. It can be used for different types of soil, and the prepared soil samples can be used in triaxial compression, shear and other tests. Background technique [0002] Triaxial test is a test method for determining the strength index of soil in civil engineering. Indoor soil sample preparation techniques can be roughly divided into two categories. Compaction method: that is, a hammer of a certain mass is dropped from a certain height, and the soil sample is compacted to the required size in one layer or in layers. However, the impact force is used in the sample preparation process, and the compacted soil samples are not uniformly stressed, and the lower layer of soil samples is...

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Problems solved by technology

However, the impact force is used in the sample preparation process, and the compacted soil samples are not uniformly stressed, and the lower layer of soil samples is denser than the upper layer of soil samples.

In addition, air is easily encapsulated in the sample during the test, resulting in large pores inside, which is not conducive to subsequent tests and may lead to distortion of test results

Consolidation method: the air-dried soil and distilled water are mixed to form a thin slurry larger than the liquid limit, poured into the sample preparation cylinder, and a static load is applied on the top to accelerate the consolidation of the soil sample. In this way, the saturated sample is obtained by the one-way drainage consolidation method. One-way drainage and consolidation tends to cause the upper and lower tops of the prepared samples to be harder and the middle to be softer

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