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تأثیر مقدار سیمان و زمان عملآوری بر مقاومت فشاری محدود نشده و ضریب ارتجاعی خاک | ||
| مهندسی زیر ساخت های حمل و نقل | ||
| مقاله 4، دوره 11، شماره 1 - شماره پیاپی 41، فروردین 1404، صفحه 59-82 اصل مقاله (2.78 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/jtie.2025.35698.1706 | ||
| نویسندگان | ||
| محمود نیکخواه شهمیرزادی* 1؛ علیرضا خلج2؛ آرزو طحان3 | ||
| 1استادیار گروه مهندسی عمران، واحد سمنان، دانشگاه آزاد اسلامی، سمنان، ایران. | ||
| 2دانش‌آموخته کارشناسی ارشد گروه مهندسی عمران، واحد سمنان، دانشگاه آزاد اسلامی، سمنان، ایران. | ||
| 3دانشیار گروه شیمی، واحد سمنان، دانشگاه آزاد اسلامی، سمنان، ایران. | ||
| تاریخ دریافت: 23 آذر 1403، تاریخ بازنگری: 10 فروردین 1404، تاریخ پذیرش: 16 فروردین 1404 | ||
| چکیده | ||
| ساخت ساختمانها و سایر سازههای مهندسی روی خاک ضعیف یا نرم، بسیار مخاطرهآمیز است زیرا چنین خاکی به دلیل مقاومت برشی کم و تراکمپذیری زیاد، مستعد نشستهای متفاوت است. بهبود برخی از خواص خاک مانند ظرفیت باربری و ویژگیهای مقاومت برشی خاک را میتوان با یکی از روشهای بهسازی، یعنی تثبیت، انجام داد. در این مقاله، تأثیر سیمان بر خصوصیات خاک واقع در منطقه جنوب شرقی سمنان مورد بررسی قرار گرفت. هدف اصلی این پژوهش، بررسی اثر سیمان بر مقاومت فشاری خاک ماسهای رسدار به همراه لای است. آزمایشهای مورد استفاده در این تحقیق شامل تراکم و مقاومت فشاری محدود نشده بود. نمونههای آزمایشگاهی به روش تراکم استاتیک تهیه شدند. نمونهها در 95 درصد جرم مخصوص خشک بیشینه به‌منظور رسیدن به بهترین تراکم و با درصدهای مختلف سیمان (2، 4، 6، 8 و10) ساخته شدند. با ازدیاد سیمان از 2 تا 8 درصد، مقاومت فشاری محدود نشده خاک سیمان افزایش یافته و افزودن بیشتر سیمان باعث کاهش مقاومت فشاری محدود نشده گردید. با ازدیاد مقدار سیمان از 2 تا 8 درصد، مقدار ضریب ارتجاعی با شیب ملایمی افزایش یافته ولی ازدیاد بیشتر سیمان تا 10 درصد، روند تغییرات به شدت افزایشی بود. ازدیاد سیمان باعث افزایش وزن مخصوص خشک بیشینه شد. با افزودن سیمان به خاک، مقاومت آن افزایش یافت؛ این افزایش مقاومت تابعی از درصد سیمان بهکار رفته و زمان عملآوری است. نتایج بهدست آمده از ضریب ارتجاعی خاک، حاکی از افزایش شکنندگی خاک اختلاط یافته با سیمان است که با افزایش درصد سیمان بهکار رفته و یا زمان عملآوری، این شکنندگی بیشتر شد. افزودن سیمان، گسیختگی نمونهها را از نرم به شکننده تغییر داد. | ||
| کلیدواژه‌ها | ||
| سیمان؛ تراکم؛ مقاومت فشاری محدود نشده؛ تنش-کرنش؛ سمنان | ||
| عنوان مقاله [English] | ||
| Effect of Cement Content and Curing Time on Unconfined Compressive Strength and Soil Elasticity Coefficient | ||
| نویسندگان [English] | ||
| Mahmoud Nikkhah Shahmirzadi1؛ Alireza Khalaj2؛ Arezoo Tahan3 | ||
| 1Assistant Professor, Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, I. R. Iran. | ||
| 2Graduated MSc., Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, I. R. Iran. | ||
| 3Associate Professor, Department of Chemistry, Semnan Branch, Islamic Azad University, Semnan, I. R. Iran. | ||
| چکیده [English] | ||
| Building the buildings and other engineering structures on weak or soft soil is very risky because such soil is prone to different settlements due to its low shear resistance and high compreessibility. Improving some soil properties such as bearing capacity and shear resistance characteristics can be done by one of the methods of improvement, which is stabilization. In this article, the effect of cement on soil properties in the southeast region of Semnan was investigated. The main objective of this research is to investigate the effect of cement on the compressive strength of sandy clay with silty soil. The tests used in this research included compaction and unconfined compressive strength. Laboratory samples were prepared by static compaction method. The samples were made in 95% of the maximum dry unit mass in order to achieve the best density and with different percentages of cement (2, 4, 6, 8, 10). With increasing the cement from 2% to 8%, the unconfined compressive strength of the cement soil increases and adding more cement causes the unconfined compressive strength to decrease. With increasing the amount of cement from 2% to 8%, the elasticity coefficient increased with a low slope, but with the increase of cement up to 10%, the trend of changes was strongly increasing. Adding cement increases the maximum dry unit weight. By adding cement to the soil, its resistance increases; This increase in strength is a function of the percentage of cement used and the curing time. The results obtained from the soil elasticity coefficient indicate an increase in the brittleness of the soil mixed with cement, which increases with the increase in the percentage of cement used or the curing time. Adding cement changes the fracture of the samples from soft to brittle. | ||
| کلیدواژه‌ها [English] | ||
| Cement, Compaction, Unconfined compressive strength, Stress-strain | ||
| مراجع | ||
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