جۆری توێژینه‌وه‌: Original Article

نوسه‌ران

Civil Department, faculty of Engineering, University of Sulaimani, Al- Sulaimaniyah, KRG/Iraq

پوخته‌

Rocks have been used as a building material throughout the history. The Engineering
Properties of rocks mainly depends on mineralogical composition and texture of the
rock type. Weathering processes influence the rock porosity in cold climate area. This
paper studies the effect of weathering (freezing thawing cycles) on physical and
mechanical properties of specific types of rock (sedimentary rocks). Freeze–thaw
cycles is one of the most important phenomena affecting the engineering properties
of rocks. This study was conducted based on literature data to analyze the durability
and stability of rocks throughout the physical and mechanical properties such as
(density, porosity, Brazilian tensile strength, unconfined compressive strength and
point load Index) of sedimentary rock specimens exposed to excessive amount
freezing-thawing cycles. Key factors that affecting the strength of frozen rocks were
analyzed. Results showed that porosity and the intensity of freezing-thawing cycles
influenced Engineering properties of sedimentary rocks significantly. The loss in
unconfined compressive strength is an important indicator for rock strength and
durability However, this test is extremely expensive and tedious. Therefore, different
correlations and Statistical models were developed using multiple regression analyses
to predict the mechanical properties of rocks such as unconfined compressive
strength and tensile strength from other physical properties and corresponding to
specified number of F-T cycles. The models are very reliable with R 2 = 95% and can
be used to predetermination of unconfined compressive strength and tensile strength
of sedimentary rocks.

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