Mounting method, dismounting method and using method of hollow cylinder sample

Abstract

The invention discloses a mounting method, a dismounting method and a using method of a hollow cylinder sample. The hollow cylinder sample comprises an inner cylinder, a consolidation outer cylinder, a permeable top cover and a drainage chassis, wherein the inner cylinder comprises four inner cylinder assemblies which are arranged in an arc shape, fixing grooves and water permeable holes; the consolidation outer cylinder comprises two semi-circular consolidation outer cylinder assemblies, a fixing table, a fixing hole A, locking blocks, limiting grooves and limiting blocks; a through hole is formed in the center of the permeable top cover; the whole drainage chassis is in a disc shape and provided with water collecting holes. The installation and connection adopts a mortise and tenon buckling mode, so that a soil sample can be more accurately close to the required standard size; a vacuum bin with relatively high leakproofness is formed, so that water and gas can be conveniently discharged, and the water content can be more accurately controlled; and moreover, the disturbance degree on the soil sample during sample disassembly is effectively reduced, secondary cutting on the inner diameter and the outer diameter of the soil sample is avoided, and the possibility is provided for rapidly manufacturing the saturated hollow cylindrical sample with the inner diameter and the outer diameter of the international common standard at one time.

Description

technical field [0001] The invention relates to the field of geotechnical technology, in particular to a method for installing, disassembling and using a hollow cylindrical sample. Background technique [0002] Remodeled clay is one of the most widely used soils in geotechnical tests. It has the characteristics of small particle size, low strength, poor permeability, easy disturbance and damage, and large deformation under force. The existing remodeling clay preparation methods mainly include compaction method and mud consolidation method. The compaction method is to pour the prepared wet soil sample into the compactor, use a heavy hammer to compact the soil sample layer by layer, and then take out the sample and carry out suction and saturation. Since it is difficult to accurately control the height of the compaction layer and the magnitude of the gravitational work manually, it is difficult to ensure the uniformity of the prepared sample, and it is difficult to accurately...

AI Technical Summary

Problems solved by technology

However, most of the existing sample preparation test equipment has a large volume, and the mud separation phenomenon in the sample preparation is relatively obvious. In order to obtain a hollow cylindrical sample that meets the size requirements, it is necessary to perform secondary cutting on the inner and outer diameters of the soil sample, which is easy It produces different degrees of disturbance to the hollow cylindrical sample (especially the side wall of the soil sample), and it is difficult to ensure the uniformity of the soil sample in the test

When the vacuum consolidation method is used for sample preparation, if the vacuum negative pressure is increased to shorten the consolidation time, and the stress applied in the follow-up test is lower than the stress level of the sample preparation, the soil sample in the test will be in the over-consolidation state. state, which has a greater impact on the test results

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