ЭКСПЕРИМЕНТАЛЬНОЕ ИССЛЕДОВАНИЕ ВЛИЯНИЯ ТЕРМИЧЕСКОЙ ОБРАБОТКИ НА ВОДОСТОЙКОСТЬ УПЛОТНЕННОГО ЛЕССА Experimental Study on the Effect of High Temperature on the Water Stability of Compacted loess in Yangling

Lu Zhang, Hui Heng Fan, Juan Xiu Yang, Ce Gao, Wei Jia Liu

Аннотация


Анализируется водостойкость уплотненного лесса после термической обработки при температурах 100...900 °C. Проведены испытания на дезинтеграцию обработанного лесса при степени уплотнения 84%...100%. После термической обработки при температурах 400°C и ниже лесс распадался в воде, а при > 500°C не распадался. Для количественного описания водостойкости термически обработанного грунта использовали коэффициент водостойкости (отношение прочности на одноосное сжатие во влажном и сухом состояниях). На водостойкость влияли как температура, так и степень уплотнения. При той же степени уплотнения время распада увеличивалось, а количество дезинтегрированного грунта уменьшалось с повышением температуры обработки. При температуре обработки 400°C или менее время распада увеличивалось, а количество грунта уменьшалось с увеличением уплотнения при той же температуре обработки. Для заданной степени уплотнения коэффициент водостойкости увеличивался с повышением температуры обработки и лишь незна-
чительно изменялся с увеличением уплотнения при температурах 500°C или более. 

Полный текст статей публикуется в английской версии журнала
«Soil Mechanics and Foundation Engineering” vol.59, No.1

High temperature treatment could change engineering properties of soil. In this study, the water stability of compacted Yangling loess  after high temperature treatment was analyzed. The relationships between different temperature from 100 ℃ to 400 ℃ and disintegration time, disintegration rate, and different compaction degree from 84 % to 100% and disintegration time, disintegration rate were delineated by disintegration tests, respectively. Different disintegration characteristics under factors of treatment temperature and compaction degree were clarified. The relationships between the water stability coefficient with different temperature from 500 ℃ to 900 ℃ and the water stability coefficient with different compaction degree from 84 % to 100% was obtained by unconfined compressive strength test. The results showed that the water stability was greatly affected by high temperature and compaction degree. Disintegration time increased and disintegration rate decreased with treatment temperature increased under same compaction degree or with compaction degree increased under same high temperature, thus the resistance to disintegration was enhanced. Water stability coefficient increased with high temperature increased under same compaction degree. With compaction degree increased, water stability coefficient variation was less than 0.2, but overall water stability coefficient of small compaction degree was slightly higher than that of big compaction degree.

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