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Accueil du site → Master → Chine → 2007 → The Test Study of the Structure Character of Aeolian Soil in the West Area of Liaoning and the Evolvement Regularity of Structure Character during Freezing and Thawing

Liaoning Technical University (2007)

The Test Study of the Structure Character of Aeolian Soil in the West Area of Liaoning and the Evolvement Regularity of Structure Character during Freezing and Thawing

Liu Gong Xun

Titre : The Test Study of the Structure Character of Aeolian Soil in the West Area of Liaoning and the Evolvement Regularity of Structure Character during Freezing and Thawing

Auteur : Liu Gong Xun

Grade : Master’s Theses 2007

Université : Liaoning Technical University

Résumé
Through a series of indoor routine soil test, including density, moisture content, specific gravity, particle analysis, as well as consolidation and shear test, aeolian soil basic physical and mechanical indexes, to create conditions for the behind the experiment and theoretical analysis. Study of the status quo of the aeolian soil particles arrangement and coupling characteristics remolded and saturated soil macro-mechanical properties, combined with electron microscopy, western Liaoning Province aeolian soil with other soil were analyzed to reveal the aeolian soil unique structural : the calculated compression coefficient describes the minimum undisturbed soil compression saturated soil compressibility. This is mainly due to the undisturbed soil is not disturbed, the arrangement of soil particles and coupling has not been destroyed, and reshape the original structure of soil and saturated soil has been damaged, so compression is larger than the undisturbed soil, aeolian soil significant structural macro reflects. e-lgt curve linear : As the pressure increases, the primary, secondary consolidation divided by the obvious becomes apparent, and later became the obvious, which is significantly different with saturated soft clay. Comprehensive structure potential as structural parameters, Fuxin region aeolian soil compared with Lanzhou and Weifang soil, body, and found significant differences. Furthermore, the images obtained by electron microscopy were compared with other areas of soil mesostructure Image reflects its compact structure, and high strength characteristics. Improved freeze-thaw test device of western Liaoning Province typical wind soil samples were freeze-thaw test. The results showed that : With the increase of the temperature gradient, the maximum frost heave and thaw value different degree of reduction ; either in a closed system or in the open system, the presence of external forces are heaving restrains financial the Shen value will decrease as the load increases ; outside water supply will make the final frost heave and thaw value increased significantly. After freezing and thawing of the specimen, pore characteristics significant changes, and changes in pore characteristics will inevitably lead to the soil skeleton features corresponding changes in the structural system of the power transmission backbone displacement occurs, resulting in structural changes. Sample after freezing and thawing, the shear strength of cohesive force part of the lower part has been increased shear strength of the friction, internal friction angle has been increased. This porosity changes caused the indirect contacts increases and arranged irregularity results are consistent with increased soil particles. Ice rate as the structural parameters by studying with moisture and stress field changes in the freeze-thaw process to reveal the the aeolian soil freezing and thawing process of structural evolution.

Mots clés : Aeolian soil Structural Freeze-thaw Ice rate Parameter

Présentation (Dissertationtopic)

Page publiée le 22 octobre 2014, mise à jour le 8 novembre 2017