کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4923737 | 1363064 | 2017 | 8 صفحه PDF | دانلود رایگان |
In order to understand the effects of soaking time and confined water pressure on the strength of rock due to dissolution of gypsum, rock samples with 96% of gypsum content collected from Kurdistan Region in northern Iraq were investigated. Laboratory tests were then performed on the normal gypsum rock samples under pre-saturated condition to obtain their uniaxial compressive strength (UCS) values. The pre-saturated samples were submerged in distilled water for 35Â d, 70Â d and 105Â d, respectively, under confined water pressures of 0-0.5Â MPa. The gypsum content decreased by 11% after 105Â d of soaking under confined water pressure of 0.5Â MPa. The UCS of the normal gypsum rock was 19.6Â MPa and it decreased to 6.3Â MPa and 2Â MPa after 105Â d of soaking under confined water pressures of 0 and 0.5Â MPa, respectively. A nonlinear constitutive model was used to simulate the experimental stress-strain relationships of rock samples under various conditions. The constitutive model parameters were sensitive to the gypsum content.
Journal: Journal of Rock Mechanics and Geotechnical Engineering - Volume 9, Issue 4, August 2017, Pages 741-748