محبوبترین نویسندگان :
نویسندگان مقالات پربازدید :
دینامیک خاک و مهندسی زلزله 2011
جزئیات رویداد
اینستاگرام تی پی بین
همایش ، رویداد ، ژورنال
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  • evaluation of temperature and freeze–thaw effects on excess pore pressure generation of fine-grained soils

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 982
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the november 3, 2002 denali-alaska earthquake (mw=7.9) caused significant liquefaction associated damage to various infrastructure built on fine-grained soils. the seismic response, liquefaction potential, and excess pore pressure generation of soils in cold regions, especially those of fine-grained nature, have not been studied thoroughly and therefore are not well-understood. this paper presents results from an extensive laboratory study on the characteristics of excess pore pressure generation and liquefaction potential of fine-grained soils. laboratory-constituted soils specimens were tested in four categories: (1) tests on specimens subjected to no thermal conditioning or freeze–thaw cycles; (2) tests on specimens conditioned at 24, 5, 1, 0.5, and −0.2 °c; (3) tests on specimens subjected to 1–4 freeze–thaw cycles; and (4) tests on specimens conditioned at near-freezing temperatures of 0.5 and −0.2 °c through different freeze–thaw paths. strain-controlled, undrained, cyclic triaxial tests were performed at shear strain levels of 0.005–0.8%. specimens conditioned at different temperatures were found to generate significantly different pore pressures with cyclic loading. the excess pore pressure generation at near or slightly below freezing was found to change dramatically. a transitional change in the dynamic soil behavior, attributed to unfrozen- or frozen-dominant pore water, was discovered. the threshold shear strain was also found to be influenced by the temperature. subjecting the soil specimens to 1, 2 and 4 freeze–thaw cycles caused a reduction in excess pore pressure generation and slight change in the threshold shear strain. the temperature conditioning path to reach the target temperature was found to be important on the development of excess pore pressure at near and slightly below-freezing temperatures.

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