ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮ ﺣﻀﻮر ﺳﺘﻮن ﻫﺎي اﺧﺘﻼط ﻋﻤﯿﻖ در زﯾﺮﺳﺎزي ﺧﻄﻮط راه آﻫﻦ ﺑﺮ ﮐﺎﻫﺶ ارﺗﻌﺎﺷﺎت ﻧﺎﺷﯽ از ﻋﺒﻮر ﻧﺎوﮔﺎن رﯾﻠﯽ

Influence of presence of deep mixed columns in railways tracks subgrade in reduce the vibrations from the train path

ﯾﮑﯽ از اﻟﮕﻮﻫﺎي اﺻﻠﯽ ﺗﻮﺳﻌﻪ ﯾﺎﻓﺘﮕﯽ در ﻫﺮ ﻣﻨﻄﻘﻪاي ﺗﻮﺳﻌﻪي ﺳﯿﺴﺘﻢﻫﺎي ﺣﻤﻞ و ﻧﻘﻞ و ﺳﻬﻮﻟﺖ دﺳﺘﺮﺳﯽ ﺑﻪ آﻧﻬﺎ در آن ﻣﻨﻄﻘﻪ ﻣﯽ ﺑﺎﺷﺪ. از ﺑﯿﻦ ﺳﯿﺴﺘﻢﻫﺎي ﻣﺨﺘﻠﻒ ﺣﻤﻞ و ﻧﻘﻞ، ﺣﻤﻞ و ﻧﻘﻞ رﯾﻠﯽ ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﺰﯾﺖ ﻫﺎي ﻣﻨﺤﺼﺮ ﺑﻪ ﻓﺮدي ﮐﻪ دارد ﻣﻮرد ﺗﻮﺟﻪ ﺳﯿﺎﺳﺘﮕﺬاران ﮐﺸﻮر واﻗﻊ ﺷﺪه و ﺗﻮﺳﻌﻪ آن ﻫﻤﻮاره ﻣﻮرد ﺗﻮﺟﻪ ﻣﯽ ﺑﺎﺷﺪ. ﺑﺎ ﺗﻮﺳﻌﻪ راه آﻫﻦ اﺟﺮاي ﺧﻄﻮط رﯾﻠﯽ ﺑﺮ روي ﺑﺴﺘﺮﻫﺎي ﺿﻌﯿﻒ و زﻣﯿﻦ ﻫﺎي ﻣﺴﺌﻠﻪ دار ﯾﮑﯽ از ﻣﺴﺎﺋﻞ اﺟﺘﻨﺎب ﻧﺎﭘﺬﯾﺮ ﺧﻮاﻫﺪ ﺑﻮد ﮐﻪ ﺑﺎﯾﺪ ﺑﺮاي رﻓﻊ اﯾﻦ ﻧﻘﯿﺼﻪ ﺗﺪﺑﯿﺮي اﻧﺪﯾﺸﯿﺪه ﺷﻮد. از ﻣﯿﺎن روش ﻫﺎي ﻣﺘﻨﻮع ﺑﻬﺴﺎزي ﺧﺎك ﺳﺘﻮن ﻫﺎي اﺧﺘﻼط ﻋﻤﯿﻖ ﺑﻪ دﻟﯿﻞ ﺳﻬﻮﻟﺖ در اﺟﺮا و ﺳﺎزﮔﺎري ﺑﺎ ﻣﺤﯿﻂ زﯾﺴﺖ ﺑﺴﯿﺎر ﻣﻮرد ﺗﻮﺟﻪ ﻫﺴﺘﻨﺪ. اﯾﻦ ﺳﺘﻮن ﻫﺎ ﻣﻮﺟﺐ اﻓﺰاﯾﺶ ﻇﺮﻓﯿﺖ ﺑﺎرﺑﺮي و ﮐﺎﻫﺶ ﻧﺸﺴﺖ ﺑﺴﺘﺮ ﺗﺤﺖ ﺑﺎرﻫﺎي وارده ﻣﯽ ﮔﺮدﻧﺪ و ﮐﯿﻔﯿﺖ ﺑﻬﺮه ﺑﺮداري را اﻓﺰاﯾﺶ ﻣﯽ دﻫﻨﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﻪ ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮ ﺣﻀﻮر ﺳﺘﻮن ﻫﺎي اﺧﺘﻼط ﻋﻤﯿﻖ در زﯾﺮﺳﺎزي ﺧﻄﻮط راه آﻫﻦ ﺑﺮ ﮐﺎﻫﺶ ﭘﺎﺳﺦﻫﺎي دﯾﻨﺎﻣﯿﮑﯽ ﺑﺴﺘﺮ ﺳﺴﺖ و ﻏﯿﺮﻣﺘﺮاﮐﻢ ﻣﺎﺳﻪاي، ﺗﺤﺖ ﺑﺎرﮔﺬاري ﻧﺎﺷﯽ از ﻋﺒﻮر ﯾﮑﯽ از ﻗﻄﺎرﻫﺎي ﻣﺘﺪاول در ﮐﺸﻮر ﭘﺮداﺧﺘﻪ ﺷﺪه اﺳﺖ. ﻧﺘﺎﯾﺞ اﯾﻦ ﺗﺤﻘﯿﻖ ﻧﺸﺎن ﻣﯽدﻫﺪ در ﺻﻮرت اﺳﺘﻔﺎده از روش اﺧﺘﻼط ﻋﻤﯿﻖ ﭘﺎراﻣﺘﺮﻫﺎي ارﺗﻌﺎﺷﯽ ﺧﺎك ﻣﺎﺳﻪاي ﺳﺴﺖ و ﻏﯿﺮﻣﺘﺮاﮐﻢ ﺑﺴﺘﺮ، ﺷﺎﻣﻞ ﺗﻐﯿﯿﺮﻣﮑﺎن ﻗﺎﺋﻢ، داﻣﻨﻪي ﺗﻐﯿﯿﺮات ﺳﺮﻋﺖ ﻗﺎﺋﻢ و داﻣﻨﻪي ﺗﻐﯿﯿﺮات ﺷﺘﺎب ﻗﺎﺋﻢ ﺑﻪ ﺗﺮﺗﯿﺐ ﺣﺪاﮐﺜﺮ %53/87% ،32/36 و %53/09 ﮐﺎﻫﺶ ﻣﯽﯾﺎﺑﻨﺪ.

One of the significant development indicators in each region is the existence of various transport systems and their accessibility. Among the various transportation methods, railroad transport due to unique advantages has attracted the attention of country policy makers. an‎d the development of the railways network is on the agenda. To expand the railway networks, construction of railway tracks on the loose subgrades is one of the inevitable issues. Among the various soil improvement methods, deep mixed columns due to implementation and economic efficiency are of interest. This method increase the bearing capacity and reduce the settlement of the loose subgrade soil and improve operation quality. In this investigation has studied the influence of presence of deep mixed columns in term of reduce the dynamic response of loose sandy subgrade soil under the train path. This investigation results show that deep mixed columns the maximum reduce in the vibration parameters of loose sandy subgrade soil such as vertical displacement, amplitude range of vertical velocity and acceleration are respectively 32/36, 53/87 and 53/09 percent.