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

مهندسی عمران فردوسی

مقاله 1، دوره 35، شماره 2 - شماره پیاپی 38، شهریور 1401، صفحه 1-18   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2022.71939.1053

نویسندگان

سهراب خضریان¹؛ علی رییسی استبرق^{* 2}؛ محدثه امینی²؛ جمال عبدالهی³

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

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

³دانشکده 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

خاک متورم‌شونده؛ تورم آزاد؛ منحنی مشخصه؛ سدیم‌کلرید و کلسیم‌کلرید

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