بررسی مقاومت برشی خاک تثبیت یافته با روش میکروبیولوژی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشگاه شیراز، تخصص: ژنوتکنیک/ مکانیک خاک/ سازه های آبی

2 دانشگاه شیراز

چکیده

تثبیت بیولوژیکی خاک روشی نوین در مقاوم‌سازی خاک در برابر فرسایش می‌باشد. در این پژوهش از باکتری تولیدکننده آنزیم اوره آز با نام علمی Sporosarcina Pasteurii با قابلیت رسوب­زایی در منافذ خاک، استفاده شد. به‌منظور بررسی میزان اثرگذاری باکتری، از مقاومت برشی خاک با دستگاه برش پره‌ای، استفاده شد. تیمارهای موردبررسی شامل نوع خاک، غلظت باکتری، زمان نگهداشت، تزریق مجدد با فاصله زمانی شش روز و تأثیر شرایط محیطی بر عملکرد باکتری و میزان مقاومت برشی می­باشد. نتایج نشانگر بهبود مقاومت برشی خاک­ها به‌صورت معنادار نسبت به زمان است. بیشترین مقاومت برشی در ماسه کربناته و سپس ماسه سیلیسی با توزیع دانه‌بندی ریزتر به ترتیب به اندازه 64/0 و 39/0 کیلوگرم بر سانتیمترمربع حاصل شد. بهترین وضعیت تعادلی بین مواد مغذی و تعداد باکتری در این پژوهش در دانسیته نوری برابر 5/1 مشاهده شد. نتایج نشان داد تزریق مجدد تأثیر افزاینده‌ای در مقاومت نمونه‌ها به‌خصوص در ماسه سیلیسی به‌اندازه 55% نسبت به یک‌بار تزریق دارد. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Shear Strength of Soil Stabilized by Microbiological Method

نویسندگان [English]

  • Seyed Mohammad Ali Zomorodian 1
  • Hamideh Ghafari 2
1 University of Shiraz
2 University of Shiraz
چکیده [English]

Biogrout is a new method in soil improvement on microbial induced calcium carbonate precipitation (MICP). In this study was utilized Sporosarcina pasteurii bacteria, an aerobic bacterium which exists pervasive in natural soil deposits, in order to control soil erosion. The undrained shear strength of the soil was measured using an in situ miniature van shear apparatus. The evaluation of shear strength are done for three types of sandy soil (Siliceous and carbonate), in four OD= 1, 1.5, 2, 2.5 levels, at different the curing time of 3, 7, 14, 20, 28 days, and, the re- injection of the bacteria solution and cementation in the interval of 6 days. Also, the influence of environmental conditions on the performance of the bacteria and the amount of shear strength are investigated. The results show that the shear strength were improved with the time. The highest shear strength was obtained in the carbonate sand and fine silica sand equals to 0.64 and 0.39 kg/cm2 in the periods of 28 days, respectively. The optimal balance between nutrients and the number of bacteria was observed at OD=1.5. Also, the results showed that the re- injection of the bacteria solution and cementation was more effective than once rejection in the shear strength, especially in the silica sand equals to 55% in a curing period of 28 days.

کلیدواژه‌ها [English]

  • Sporosarcina pasteurii
  • shear strength
  • Van Shear Apparatus
  • Soil erosion
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