Prediction of long-term slake durability of clay-bearing rocks

Document Type: Research Paper

Authors

1 Postgraduate student in Engineering geology, Bu-Ali Sina University, Geology Department, Hamadan

2 Assisstant Prof. in Engineering geology, Bu-Ali Sina University, Geology Department, Hamadan

3 Associate Prof. in Sedimentary Petrology, Bu-Ali Sina University, Geology Department, Hamadan

4 PhD student in Engineering geology, Bu-Ali Sina University, Geology Department, Hamadan

Abstract

A research program was conducted on different clay-bearing rocks selected from the Ilam, Sarpol-e Zahab and Tajarak regions (Iran) to predict their slaking characteristics. The new durability apparatus (nested mesh drums) separates disintegrated particles varying from > 25.4 to < 2 mm as the drums were rotated. On the basis of the particle size distribution, the disintegration ratio (DR) was used to evaluate the rock durability. A concept was proposed to describe the rock slaking characteristics under the slake durability test cycles, by using the difference in the DR values between the adjacent (ΔDR) and backward (N*) cycles. This allows the estimation of the rock durability as it is subjected to a larger number of test cycles, and hence the prediction of the effects of weathering processes. This prediction provides an effective approach when data are limited or inaccessible. Therefore, a new classification system is introduced for rock durability assessment. The test results show that the Gurpi-limey marls (G-2, G-3) and the Pabdeh-marly limestone (P-3) are classified as moderate to high durability rocks

Keywords


Article Title [Persian]

پیش بینی دوام بلند مدت سنگ های حاوی کانی های رسی

Authors [Persian]

  • وحید رستگاریان 1
  • مجتبی حیدری 2
  • بهروز رفیعی 3
  • یزدان محبی 4
1 دانشگاه بوعلی سینا
2 استادیار زمین شناسی مهندسی دانشگاه بوعلی سینا همدان
3 دانشیار رسوب شناسی و سنگ شناسی رسوبی دانشگاه بوعلی سینا
4 دانشجوی دکترا زمین شناسی مهندسی دانشگاه بوعلی سینا عضو هیات علمی دانشگاه پیام نور
Abstract [Persian]

این پژوهش برای پیش بینی ویژگی های دوام سنگ های حاوی کانی های رسی در مناطق ایلام، سرپل ذهاب و تجرک انجام شده است. دستگاه دوام جدید با استوانه های متحد المرکز هم محور قطعات خرد شده در اندازه های 2 تا 4/25 میلیمتر را در حال چرخش از هم جدا می کند. بر اساس توزیع اندازه دانه ها، شاخص نسبت تخریب(DR) برای ارزیابی دوام سنگ ها مورد استفاده قرار گرفت. با استفاده از نمودار *ΔDR-N بدست آمده از آزمایش دوام دینامیکی، ویژگی های دوام سنگها توصیف شد. که امکان تخمین دوام سنگها در تعداد چرخه های بیشتر و پیش بینی اثر فرایندهای هوازدگی را فراهم می کند. این پیش بینی، یک روش موثر هنگامی که داده ها محدود و یا غیر قابل دسترس هستند را فراهم می کند. لذا یک رده بندی جدید برای ارزیابی دوام سنگها معرفی شد. نتایج مطالعه حاضر نشان می دهد که مارن آهکی سازند گورپی( G-2،G-3) و آهک مارنی سازند پابده(P-3) در رده سنگ های با دوام متوسط تا بالا قرار می گیرند.

Keywords [Persian]

  • شکفتگی
  • سنگ های حاوی کانی های رسی
  • دوام پذیری
  • شاخص نسبت تخریب
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