دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

مطالعه­ شاخص­ های رسوب ­شناسی آبرفت ­های رودخانه خرم­ رود (شهرستان خرم ­آباد) و ارزیابی مناسب بودن آن­ها برای استفاده به عنوان سنگدانه بتن

نویسندگان
1 دانشیار گروه زمین‌شناسی، دانشکده علوم، دانشگاه لرستان، خرم‌آباد، ایران
2 دانشجوی دکترا رسوب‌شناسی و سنگ‌شناسی رسوبی، دانشکده علوم، دانشگاه بوعلی‌سینا، همدان، ایران، کارشناس آزمایشگاه مرکزی دانشگاه لرستان، خرم‌آباد، ایران
3 گروه زمین شناسی مهندسی، مؤسسه فناوری، علم و پایایی، دانشگاه فدراسیون، بالارات 3350، وی آی سی، استرالیا
چکیده
هدف از پژوهش حاضر، بررسی شاخص­های رسوب­شناسی رسوبات رودخانه خرم­رود (شهرستان خرم­آباد، استان لرستان) به روش لحظه­ای، تعیین منشأ رسوبات و شناخت عامل حمل آن­ها و در نهایت ارزیابی پتانسیل رسوبات رودخانه مذکور برای استفاده به­عنوان سنگدانه بتن می­باشد. در این راستا تعداد 15 نمونه به صورت نظام­مند از رسوبات کف و دیواره کانال رودخانه برداشت گردید. بر اساس آنالیز دانه­بندی، رسوبات در چهار گروه ماسه گراولی، گراول ماسه­ای، گراول ماسه­ای گلی و ماسه گلی گراولی قرار دارند. میانگین جورشدگی رسوبات 21/2 فی می­باشد که بیانگر جورشدگی بسیار بد رسوبات است. میانگین شاخص کشیدگی ذرات 82/1 و میانگین کج‌شدگی آن­ها 13/0 بوده که گویای کج­شدگی به سمت رسوبات دانه­­ریز است. حرکات کششی، جهشی و معلق به عنوان مهم­ترین مکانیسم­های حرکت رسوبات شناخته شدند. اجزاء آواری رسوبات شامل کوارتز، فلدسپات و خرده سنگ­های رسوبی، آذرین و دگرگونی می­باشند. فرسایش سنگ­های رسوبی تاقدیس خرم­آباد را می­توان به عنوان منشأ اصلی خرده­سنگ­های رسوبی رودخانه در نظر گرفت. منشأ سایر ذرات نظیر کوارتز، فلدسپات و خرده­سنگ­های آذرین و دگرگونی را می­توان به حمل و انتقال آن­ها از منشأ بالادستی رودخانه نسبت داد. رودخانه خرم­رود از نوع مآندری با پیچش کم می­باشد که در بازه­های زمانی مورد هجوم سیلاب­های قوی و مخرب قرار گرفته به طوری­که جورشدگی بسیار بد رسوبات در ارتباط با این سیلاب­ها می­باشد. در پایان نتایج دانه­بندی نشان داد از 15 نمونه رسوب مورد مطالعه، 2 نمونه از آن­ها قابلیت استفاده به عنوان سنگدانه بتن را دارند.
کلیدواژه‌ها

عنوان مقاله English

Study of sedimentological indices of alluviums of Khorramrood River (Khorramabad city) and evaluation of their suitability for use as concrete aggregate

نویسندگان English

A. Jamshidi 1
M. Sedaghatnia 2
S. Aligholi 3
1 Assoc. Prof., Dept., of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
2 Ph. D., student sedimentology and sedimentary rocks, Bu Ali Sina University, Hamedan, Iran, Expert of the Central Laboratory of Lorestan University, Khorramabad, Iran
3 Dept., of Engineering Geology, Institute of Innovation, Science and Sustainability, Federation University, Ballarat 3350, VIC, Australia 3350, VIC, Australia
چکیده English

The aim of the study present is to investigate the sedimentological parameters of the sediments of Khorramrood River (Khorramabad city, Lorestan Province) using the moment’s method, and determining the origin and how they are transported. In this regard, 15 samples were systematically taken from the bottom and wall sediments of the river channel from depths between 5 and 20 cm. Next, a number of 15 microscopic thin-sections from the sediment grains with a size of 1 φ were prepared for mineralogical composition studies with aim determining the source rock of the sediments. The statistical analyses revealed that there are a range of sedimentary grains with the different sizes, with an average diameter of 0.57 φ (coarse sand), in Khorramrood River. According to the results of gradation analysis, the sediments fall into the four groups including gS gravel sand (33.33%), sG sand gravel (33.33%), msG sand gravel (20.00%), and gmS sand gravel (13.33%). The average of sediments sorting was equal to 2.21 φ, indicating the very bad sorting of sediments. The average of elongation index (K) and skewness (Sk) of the grains is 1.82 and 0.13, respectively, showing that they are skewed towards fine-grained sediments. According to the investigations, stretching, jumping, and suspension were identified as the most main mechanisms of sediment movements. The detrital components of the sediments include quartz, feldspar, and sedimentary rock-fragments (such as sandstone, carbonate, and chert) and with the less amounts igneous and metamorphic rock-fragments. Based on these findings, the erosion of sedimentary rocks belonging to Khorramabad anticline can be considered as the main source of Khorramrood river sediments. Finally, the gradation results showed that among the studied sediment samples, 2 of them have the potential to be used as concrete aggregate.

کلیدواژه‌ها English

Khorramrood River, Alluvium, Sedimentology, Moment&rsquo
s method, Concrete aggregate
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  • تاریخ دریافت 23 شهریور 1403
  • تاریخ بازنگری 28 بهمن 1403
  • تاریخ پذیرش 30 بهمن 1403