Для формирования технологических свойств глин разработаны различные способы их обработки: тепловая, химическая, ультрафиолетовая, механическая и др. Однако вопросы трансформации энергетических свойств поверхности глинистых частиц, предварительно уплотненных стрессовым давлением, изучены недостаточно полно. Поэтому целью работы является изучение закономерностей изменения сил адгезии на поверхности частиц монтмориллонитовой и каолиновой глин, обработанных стрессовым давлением до 800 МПа и сдвигом на 90°. Исследования сил адгезии образцов глин, подвергнутых стрессовому давлению и сдвигу, осуществлялись при помощи атомно-силового микроскопа NT-MDT NTEGRA Prima (Россия). Экспериментально доказано, что при механической обработке каолиновой и монтмориллонитовой глин стрессовым давлением и сдвигом изменения силы адгезии имеют разнонаправленный характер. В каолиновой глине при увеличении давления сила адгезии возрастает. В монтмориллонитовой рост давления до 150 МПа приводит к усилению адгезионного взаимодействия, дальнейшее увеличение до 800 МПа — к его снижению. Выявлено, что при обработке глин стрессовым давлением и сдвигом в них протекают процессы дробления, агрегации и деформации частиц, приводящие к изменению дефектности кристаллической решетки и поверхности частиц. Такие преобразования вызывают изменения энергетического потенциала глинистых частиц, что в свою очередь изменяет сорбционные и адгезионные свойства глин. При этом в исследуемых грунтах формирование энергетического потенциала на поверхности частиц при воздействии высоких давлений происходит по-разному: в каолиновой глине основным является процесс дробления, а в монтмориллонитовой — агрегации.

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Vol. 124–125, pp. 127–136, https://doi.org/10.1016/j.clay.2016.01.033.

СЕРЕДИН В.В.
Пермский государственный национальный исследовательский университет, г. Пермь, Россия, seredin@nedra.perm.ru
Адрес: ул. Букирева, д. 15, г. Пермь, 614068, Россия
ЛУНЕГОВ И.В.
Пермский государственный национальный исследовательский университет, г. Пермь, Россия, lunegov@psu.ru
ФЕДОРОВ М.В.*
Пермский государственный национальный исследовательский университет, г. Пермь, Россия, fedorovmaxim5035@gmail.com
МЕДВЕДЕВА Н.А.
Пермский государственный национальный исследовательский университет, г. Пермь, Россия, nata-kladova@yandex.ru

For the formation of the technological properties of clays, various methods of their processing have been developed: thermal, chemical, ultraviolet, mechanical, etc. However, the issues of changing the energy properties of the surface of clay particles, previously compacted by stress pressure, are not fully understood. Therefore, the aim of the work is to study the patterns of change in adhesion forces on the surface of particles of montmorillonite and kaolin clays treated with stress pressure up to 800 MPa and a shift of 90°. The adhesion forces of clay samples subjected to stress pressure and shear were studied using an NT-MDT NTEGRA Prima atomic force microscope (Russia). It was experimentally proved that during the machining of kaolin and montmorillonite clays by stress pressure and shear changes in adhesion forces are multidirectional in nature. In kaolin clay, as the pressure increases, the adhesion force increases. In montmorillonite, an increase in pressure up to 150 MPa leads to an increase in the adhesive interaction, a further increase to 800 MPa leads to its decrease. It was revealed that during the processing of clays by stress pressure and shear, the processes of crushing, aggregation and deformation of particles occur in them, leading to a change in the defectiveness of the crystal lattice and the surface of the particles. Such transformations create changes in the energy potential of clay particles, which in turn changes the sorption and adhesive properties of clays. At the same time, in the studied soils the formation of the energy potential on the surface of particles takes place in different ways: in kaolin clays, the main factor is the crushing process, and in montmorillonite — aggregation.

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39. Zhu X., Zhu Z., Lei X., Yan C., 2016. Defects in structure as the sources of the surface charges of kaolinite. Applied Clay Science,
Vol. 124–125, pp. 127–136, https://doi.org/10.1016/j.clay.2016.01.033.

VALERIY V. SEREDIN
Perm State National Research University; Perm, Russia; seredin@nedra.perm.ru
Address: Bld. 15, Bukireva St., 614068, Perm, Russia
IGOR V. LUNEGOV
Perm State National Research University; Perm, Russia; lunegov@psu.ru
MAXIM V. FEDOROV*
Perm State National Research University; Perm, Russia; fedorovmaxim5035@gmail.com
NATALIA A. MEDVEDEVA
Perm State National Research University; Perm, Russia; nata-kladova@yandex.ru