ﻣﻄﺎﻟﻌﮥ ﺗﺄﺛﯿﺮ ﻧﺎﻧﻮ رس و ﭘﻮدر ﺳﻨﮓ آﻫﮏ ﺑﺮ وﯾﮋﮔﯽﻫﺎي ژﺋﻮﺗﮑﻨﯿﮑﯽ ﺧﺎكﻫﺎي رﺳﯽ ﺷﺮق ﺗﺒﺮﯾﺰ

Study of Nano-clay and Limestone Powder Effects on the Geotechnical Properties of Clayey Soil of Eastern Tabriz

ﺧﺎكﻫﺎي رﺳﯽ ﺑﻪ دﻟﯿﻞ ﮐﺎﻫﺶ ﺷﺪﯾﺪ ﻣﻘﺎوﻣﺖ و ﻗﺎﺑﻠﯿﺖ اﻓﺰاﯾﺶ ﺣﺠﻢ در اﺛﺮ ﺟﺬب رﻃﻮﺑﺖ، ﺑﻪ ﻋﻨﻮان ﯾﮑﯽ از ﺧﺎكﻫﺎي ﻣﺴﺌﻠﻪدار در ﮐﺎرﻫﺎي ﻣﻬﻨﺪﺳﯽ و ﻋﻤﺮاﻧﯽ ﻣﻄﺮح ﻣﯽﺑﺎﺷﻨﺪ. اﻣﺮوزه از ﻧﺎﻧﻮ ﻣﻮاد ﻫﻤﭽﻮن ﻧﺎﻧﻮ رس در ﺟﻬﺖ ﺑﻬﺴﺎزي و ﺗﺜﺒﯿﺖ ﺧﺎك ﻫﺎي رﺳﯽ اﺳﺘﻔﺎده ﻣﯽﺷﻮد. از ﺳﻮي دﯾﮕﺮ، ﺣﺠﻢ روز اﻓﺰون ﻧﺨﺎﻟﻪﻫﺎي ﺣﺎﺻﻞ از ﺗﺨﺮﯾﺐ ﺳﺎﺧﺘﻤﺎنﻫﺎ از ﺟﻤﻠﻪ ذرات و ﻗﻄﻌﺎت ﺳﻨﮓ ﻣﺸﮑﻼت ﻓﺮاواﻧﯽ را از ﻧﻈﺮ زﯾﺴﺖ ﻣﺤﯿﻄﯽ در ﺷﻬﺮﻫﺎي ﺑﺰرگ ﺑﻪ وﺟﻮد آوردهاﻧﺪ. ﻫﺪف از اﯾﻦ ﭘﮋوﻫﺶ، ﻣﻄﺎﻟﻌﻪ اﻣﮑﺎن ﭘﺬﯾﺮي ﺗﺎﺛﯿﺮ ﺗﺮﮐﯿﺐ ﻣﺎده اﻓﺰودﻧﯽ ﻧﺎﻧﻮ رس و ﭘﻮدر ﺳﻨﮓ آﻫﮏ در ﺧﺎك رس ﮐﻮي ﻧﺼﺮ ﺷﻬﺮ ﺗﺒﺮﯾﺰ ﺟﻬﺖ ﺑﻬﺒﻮد ﺧــﻮاص ژﺋــﻮﺗﮑﻨﯿﮑﯽ از دﯾﺪﮔﺎه ﺗﻮاﻧﺎﯾﯽ ﺑﺎرﺑﺮي و ﺗﻐﯿﯿﺮ ﺷﮑﻞ ﻣﯽﺑﺎﺷﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ، ﻧﺎﻧﻮ رس و ﭘﻮدر ﺳﻨﮓ آﻫﮏ در دو ﺣﺎﻟﺖ ﺟﺪاﮔﺎﻧﻪ و ﺗﺮﮐﯿﺒﯽ ﺑﺎ درﺻﺪﻫﺎي 5 و 10 ﺑﺎ ﺧﺎك رس ﻣﺨﻠﻮط ﺷﺪهاﻧﺪ. ﻋﻤﻞ آوري ﺑﺮ روي ﻧﻤﻮﻧﻪﻫﺎي ﺗﺜﺒﯿﺖ ﺷﺪه در ﻣﺪت زﻣﺎن 14،7 و28 روزه ﺻﻮرت ﮔﺮﻓﺘﻪ اﺳﺖ. ﺑﻪ ﻣﻨﻈﻮر ارزﯾﺎﺑﯽ ﻣﯿﺰان ﺗﺎﺛﯿﺮ ﮔﺬاري ﻣﻮاد ﻣﺬﮐﻮر ﺑﺮ ﭘﺎراﻣﺘﺮﻫﺎي ژﺋﻮﺗﮑﻨﯿﮑﯽ ﺧﺎك رس آزﻣﻮنﻫﺎي آزﻣﺎﯾﺸﮕﺎﻫﯽ ﺣﺪود آﺗﺮﺑﺮگ، ﺗﺮاﮐﻢ، ﺗﮏ ﻣﺤﻮري، ﺑﺮش ﻣﺴﺘﻘﯿﻢ )ﺗﺤﺖ اﺛﺮ ﺗﻨﺶﻫﺎي ﻗﺎﺋﻢ 2 ،1 و 3 ﮐﯿﻠﻮﮔﺮم ﺑﺮ ﺳﺎﻧﺘﯿﻤﺘﺮ ﻣﺮﺑﻊ( اﻧﺠﺎم ﮔﺮﻓﺘﻪ اﺳﺖ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن ﻣﯽدﻫﺪ ﺗﺎﺛﯿﺮ ﻫﻤﺰﻣﺎن 5% ﻧﺎﻧﻮ رس ﺑﻪ ﻫﻤﺮاه 10 % ﭘﻮدر ﺳﻨﮓ آﻫﮏ در ﻣﺪت زﻣﺎن ﻋﻤﻞ آوري 7 روزه در ﺷﺮاﯾﻂ دﻣﺎي ﻣﺤﯿﻂ ﺑﻪ ﺧﺎك رس ﺳﺒﺐ ﮐﺎﻫﺶ ﺷﺎﺧﺺ ﺧﻤﯿﺮي ﺑﻪ ﻣﻘﺪار 72 % ، ﺑﻬﺒﻮد ﺳﺎﺧﺘﺎر داﻧﻪ ﺑﻨﺪي و ﮐﺎﻫﺶ ﻓﻀﺎي ﺧﺎﻟﯽ و اﻓﺰاﯾﺶ ﻣﻘﺎوﻣﺖ ﺑﺮﺷﯽ ﺑﻪ ﻣﯿﺰان 33 % ﺷﺪه اﺳﺖ.

Clayey soils in terms of sharp reduction in strength and swelling ability as a results of water and moisture absorption, it is considered as one of the most problematic soils in civil engineering and construction works. Nowadays, Nano materials such as Nano clay are used to improve and stabilize of clay. On the other side, the increasing volume of municipal waste and residues materials especially debris of building destruction have caused many problems in mega cities such as environmental issues due to incorrect disposal of waste material. Main propose of this research is study of possibility in effecting Nano clay and limestone powder mixture for improve geotechnical properties of Kuye Nasr clayey soil in Tabriz City. In this study, Nano clay and limestone powder in both separate and combined conditions with 5 and 10 percentage are mixed with clay. Curing of stabilized specimens have been performed in 7, 14 and 28 days. For evaluating geotechnical behavior of mixture materials some tests were performed such as Atterberg limits, Compaction, uniaxial strength and direct shear (in 1, 2 and 3 kg/cm2 vertical stress). Results show that the simultaneous effects of 5% Nano clay with 10% limestone powder with 7 days curing period in ambient temperature conditions in clay reduced plasticity index by 72%, improved graining skeleton structure, reduced void ratio of inter grains and increased shear strength by 33%.