اثر کیفیت شیمیایی مایعات منفذی مختلف بر ارتباط مکش با پتانسیل تورمی یک خاک متورم-شونده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه آبیاری و آبادانی، دانشکده مهندسی و فناوری، دانشگاه تهران

2 گروه آبیاری و آبادانی، دانشکده مهندسی و فناوری، دانشگاه تهران.

3 دانشکده مهندسی و فناوری، دانشگاه تهران.

چکیده

در این کار تحقیقاتی، ارتباط مکش­ ماتریک با پتانسیل تورمی و فشار تورمی یک خاک متورم­شونده تهیه‌شده با مایعات منفذی مختلف (آب مقطر، سدیم­کلرید و کلسیم­کلرید) با انجام آزمایش­های لازم، مورد مطالعه قرار گرفت. نمونه­هایی از خاک متورم­شونده که حاوی مایع منفذی آب مقطر و محلول­های سدیم­کلرید و کلسیم­کلرید با غلظت g/l  250 بودند، به­روش تراکم استاتیکی تهیه شدند و منحنی مشخصه آب و خاک با استفاده از روش فیلتر کاغذی برای هر یک از آن‌ها تعیین شد. با انجام آزمایش­های مربوط، میزان تورم آزاد و فشار تورمی در رطوبت­های مختلف برای هر نمونه به­دست آمد. هم‌چنین با استفاده از منحنی مشخصه هر نمونه برای هر رطوبت، مکش معادل آن به­دست آمد. سپس منحنی تغییرات مقادیر تورم و فشار تورمی با مکش تعیین گردید. نتایج نشان داد که کیفیت­های گوناگون مایع منفذی سبب ایجاد منحنی­های مشخصه آب و خاک مختلف می­گردد. از طرفی مقایسه نتایج مشخص نمود که در هر مکش مشخص، پتانسیل تورمی و فشار تورمی نمونه­های با مایع منفذی سدیم­کلرید بیشتر از سایر مایعات منفذی می­باشد. علاوه بر این نتایج SEM نشان داد که ساختار خاک برای مایعات منفذی مختلف یکسان نمی­باشد و برای یک مایع منفذی مشخص نیز، ساختار خاک در ابتدا و انتهای آزمایش متفاوت است. 

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Different Chemical Quality Pore Fluids on the Relationship Between Suction and Swelling Characteristics of an Expansive Soil

نویسندگان [English]

  • Sohrab Khezrian 1
  • Ali Raeesi Estabragh 2
  • Mohadeseh Amini 2
  • jamal abdollahi 3
1 Hydraulic Structures, Irrigation and Reclamation Department, Tehran University, Iran.
2 Geotechnical Engineering, Irrigation and Reclamation Department, Tehran University, Iran.
3 Civil Engineering, Irrigation and Reclamation Department, Tehran University, Iran.
چکیده [English]

In this research work, the relationship between suction and swelling potential and swelling pressure of an expansive soil with different chemical pore fluid qualities was investigated through experimental tests. Different soils were prepared with different chemical qualities of pore fluid (distilled water, sodium chloride, and calcium chloride solutions with concentration of 250 g/l). The samples were made by the static compaction method for testing. Soil-Water characteristic curves were determined by the filter paper method for each prepared soil sample. By performing the swelling tests, the amount of free swelling and swelling pressure for different water content were obtained for each sample with different pore fluid. By using the Soil-Water characteristic curve of each sample, the equivalent suction was obtained for each water content. Then the curve of variations of free swelling and swelling pressure versus suction were obtained for each pore fluid. The results showed that the pore fluid with different qualities causes different Soil-Water characteristic curves. On the other hand, comparing the results showed that, at a given suction the swelling potential and swelling pressure of the samples with NaCl solution as a pore fluid was more than the samples with the pore of distilled water or CaCl2 solution. In addition, the SEM results revealed that the soil structure is dependent on the used pore fluid quality. Also, for a specific pore fluid, the soil structure is not the same at the beginning and end of the test.

کلیدواژه‌ها [English]

  • Expansive soil
  • Free swelling
  • characteristic curve
  • Sodium chloride
  • Calcium chloride

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