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Research of loss of mass of substance in the compression of clays

UDK: УДК 624.131.43

A.V. Anukhina, M.V. Fedorov, V.V. Seredin, I.I. Minkevich

When rocks are loaded, stress concentration appears around defects leading to growth and spread of fractures. Hypothesized, that the destruction of rocks takes place in two stages: initially formed backbone fracture gap, then the rock is a shift for this crack. Depending on the stresses applied to the ground in the fracture zone, microdeformation processes take place between the structural segregations, a certain morphology of the crack surface is formed, sand of friction appears, the temperature of the material changes, which leads to a change in the phase state of the soil. Under these conditions, the water content of the clays must vary depending on the pressures applied to the ground. However, experimental information on this issue is not enough. Therefore, the aim of this paper is to study the regularities of the change in the content (mass) of water in clays, depending on the pressures exerted on the clay sample. It was experimentally established that the content of loosely bound and firmly bound forms of water, as well as of hydroxyl groups and the mass of recrystallization of minerals, is controlled not only by the composition, structure and properties of the crystal lattice of montmorillonite and kaolinite clay, but also by the amount of pressures to which the soil sample was subjected. With increasing pressure, the loss of mass of firmly bound water increases. For loosely bound water, the relationship between pressure and mass loss could not be established. It was found that the total loss of water mass with increasing stresses in kaolinite clay is less (m = 13.2%) than in montmorillonite clay (m = 16.9%).

Файл: А.В. Анюхина, М.В. Федоров, В.В. Середин, И.И. Минькевич.pdf, 7 pag.

Рубрика: Инженерная геология
Выпуск №8: По материалам IX Всероссийской молодежной конференции аспирантов, молодых ученых и студентов «СОВРЕМЕННЫЕ ТЕХНОЛОГИИ В СТРОИТЕЛЬСТВЕ. ТЕОРИЯ И ПРАКТИКА», (Часть I ,июнь, 2017)


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