Evaluation of Biogrouting Method in Sandy Soil improvement in Column Injection Experiments

  • سال انتشار: 1391
  • محل انتشار: هفتمین سمپوزیوم بین المللی پیشرفتهای علوم و تکنولوژی
  • کد COI اختصاصی: SASTECH07_048
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 1472
دانلود فایل این مقاله

نویسندگان

A.R Sotoudehfar

Student of M.Sc. in Geotechnics, Islamic Azad University Najafabad Branch, Isfahan, Iran

E Mokhtari

Student of M.Sc. in Geotechnics, Islamic Azad University Najafabad Branch, Isfahan, Iran

M.M Sadeghi

Assistant Prof., Department of Civil Engineering, Islamic Azad University Najafabad Branch, Isfahan, Iran

F Shafiei

Research Assistant, Lab. of Microbiology, Isfahan Higher Education and Research Institute (IHEARI), Isfahan, Iran

M Abtahi

Associate Prof., Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran

چکیده

Improvement of soils is among the major concerns in civil engineering. For this, a variety of approaches have been employed for different soil types. The annual budget of implementing the projects of this kind in countries clearly implies the importance of the subject. The loose granular soils and sediments have always imposed challenges due to their low strength and bearing capacity as well as difficulties in drilling and excavation. Biogrouting has recently been introduced as a novel link of biotechnology and civil engineering for improving the problematic soils, i.e. utilizing some bacteria to precipitate calcite on the soil particles. In the present study, the Sporosarcina pasteurii PTCC 1642 (DSM 33) was used as the bacterial agent to improve soil strength parameters in a two-phase injection approach. Bacterial injection to a sandy soil column was followed by nutrients injection containing CaCl2 and urea and the soil columns were settled in the ambient temperature. Experiments were performed in triplicates and conducted for two types of sandy soils. The unconfined compressive strength of soil specimens was evaluated after 15 days of the last injection. The results show significant increase in the soil strength with values of 1.78 and 2.83 Kg/cm2 for the two investigated soil types according to t test.

کلیدواژه ها

Biogrouting, Soil improvement, Bacteria, Column injection, Sandy soil

مقالات مرتبط جدید

اطلاعات بیشتر در مورد COI

COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.

کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.