CRS temperature control consolidation system and method based on nuclear magnetic scanning

Abstract

The invention discloses a CRS temperature control consolidation system and method based on nuclear magnetic scanning, and belongs to the field of marine geotechnical engineering. The system comprises a continuous loading device, a consolidation chamber, a temperature control device, a computer, a data acquisition and processing system and a nuclear magnetic resonance scanning device. The heating refrigerator and the micro circulating pump are used for temperature control; the consolidation chamber is made of high-temperature-resistant organic glass, so that nuclear magnetic resonance scanning can be performed in the consolidation process, and the microstructure change of soil in the consolidation process can be observed; the two semicircular limiting blocks are combined to limit the displacement of the pressurizing rod, so that the influence of soil body rebound on a scanning result and a subsequent test during nuclear magnetic scanning is avoided; and the use of the organic glass material is also beneficial to observing the consolidation chamber in the consolidation process, and is beneficial to the proceeding of the test. A constant strain rate consolidation method is adopted, so that the consolidation test speed is greatly increased; and the system can also be used for exploring the influence of temperature on the consolidation test.

Description

technical field [0001] The invention belongs to the field of marine geotechnical engineering, and relates to a CRS temperature-controlled consolidation system and method, in particular to a CRS temperature-controlled consolidation system and method capable of in-situ NMR scanning of soil. Background technique [0002] Seabed marine soil is a kind of soft clay soil with extremely low strength, and structures such as suction anchors directly act on the seabed marine soil; marine soil contains microbial debris such as diatoms, and has a strong structure. Marine soil is different from terrestrial clay, so the study of various characteristics of marine soil is of great significance for the exploration and exploitation of marine resources. The original consolidation test can only control the temperature. After the consolidation is completed, the sample is taken out and put into the NMR scanning for scanning. However, the sampling process will inevitably disturb the sample, and cha...

AI Technical Summary

Problems solved by technology

The original consolidation test can only control the temperature. After the consolidation is completed, the sample is taken out and put into the NMR scanning for scanning. However, the sampling process will inevitably disturb the sample, and changes in external stress conditions will also affect the stability of the sample. It will affect the soil sample and cannot observe the structural changes during the consolidation process, which has obvious shortcomings for marine soils with low strength, strong structure and microbial debris

[0003]In recent years, X-ray tomography and CT scanning have been applied to observe unsaturated soil granular materials, but for clay materials, X-ray tomography and CT scanning are not accurate enough Distinguishing clay particles and their pores, not applicable to clay

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