تحليل ترك در ارتباط با پايداري سدهاي وزني‌بتني با استفاده از نرم‌افزار CADAM (مطالعه موردي: سد تنظيمي دز)

Crack analysis related to the stability of gravity and concrete dams using CADAM software (Case study: Dez regulatory dam)

ﻣﻄﺎﻟﻌﻪ ﺣﺎﻇﺮ ﺑﻪ ﺑﺮرﺳﯽ ﺗﻨﺶ و ﺗﺤﻠﯿﻞ ﺗﺮك در ﺳﺪﻫﺎي وزﻧﯽ-ﺑﺘﻨﯽ ﺗﺤﺖ ﺷﺘﺎب ﺛﺎﺑﺖ ﺣﺎﺻﻞ از زﻣﯿﻦﻟﺮزه در راﺳﺘﺎي اﻓﻘﯽ و زﻟﺰﻟﻪﻫﺎي اﻟﻘﺎﯾﯽ ﺗﻮﻟﯿﺪ ﺷﺪه از ﺟﺎﻧﺐ ﻣﺨﺰن ﺳﺪ ﭘﺮداﺧﺘﻪ اﺳﺖ. اﯾﻦ ﺗﺤﻠﯿﻞ ﺑﺎ اﺳﺘﻔﺎده از ﻧﺮماﻓﺰار CADAMاﻧﺠﺎم ﺷﺪ. ﻫﺪف اﺻﻠﯽ از ﻣﺤﺎﺳﺒﺎت ﺗﻨﺶ، ﺗﻌﯿﯿﻦ ﻣﯿﺰان ﮐﺸﺶ ﻃﻮل ﺷﮑﺎف ﻣﯽﺑﺎﺷﺪ ﮐﻪ ﺑﺮ اﺛﺮ ﻧﯿﺮوﻫﺎي اﯾﻨﺮﺳﯽ ﻣﻮﺟﻮد در ﺳﺪ اﯾﺠﺎد ﻣﯽﺷﻮﻧﺪ و ﺗﺄﺛﯿﺮ اﯾﻦ ﺗﻨﺶﻫﺎ ﺑﺮ ﭘﺎﯾﺪاري ﺳﺪ ﺑﺘﻨﯽ ﻣﯽﺑﺎﺷﺪ. ﻧﺮماﻓﺰار CADAMدر ﺳﺎل 2003در داﻧﺸﮕﺎه ﻣﻮﻧﺘﺮال و ﺑﺮاي ﺗﺤﻠﯿﻞ ﺳﺪﻫﺎي ﺑﺘﻨﯽ در ﺣﺎﻻت ﻣﺨﺘﻠﻒ ﻃﺮاﺣﯽ ﺷﺪه اﺳﺖ. در اﯾﻦ ﻣﻘﺎﻟﻪ ﺑﻪ ﺗﺤﻠﯿﻞ ﺷﮑﺎف و ﺗﺄﺛﯿﺮ آن ﺑﺮ ﭘﺎﯾﺪاري ﺳﺪ وزﻧﯽﺑﺘﻨﯽ ﺑﺎ ﺑﯿﺸﯿﻨﻪ زﻟﺰﻟﻪ g 0/28ﭘﺮداﺧﺘﻪ ﺷﺪ و ﻧﺘﺎﯾﺞ آن در ﻫﺮ درز اﺟﺮاﯾﯽ ﺑﻪ ﺻﻮرت ﻣﺠﺰا ﻣﻮرد ﺗﺤﻠﯿﻞ ﻗﺮار ﮔﺮﻓﺖ. در ﺗﻤﺎﻣﯽ درزﻫﺎ ﺣﺪاﻗﻞ ﺿﺮﯾﺐ اﯾﻤﻨﯽ در ﺑﺮاﺑﺮ ﭘﺎﯾﺪاري )ﺣﺪاﻗﻞ 1/3( ﺣﺎﺻﻞ ﺷﺪ. ﺑﺎ ﻣﺸﺎﻫﺪه ﺟﺪاول ﻧﺘﺎﯾﺞ ﻣﯽﺗﻮان ﺑﻪ اﯾﻦ ﻧﺘﯿﺠﻪ رﺳﯿﺪ ﮐﻪ ﭘﺎﯾﺪاري ﺳﺪ ﺗﻨﻈﯿﻤﯽدز ﺑﺮاي ﺷﺘﺎب زﻟﺰﻟﻪ اﻓﻘﯽ ﻣﻌﺎدل 0/28 gﻣﻨﺎﺳﺐ ﺑﻮده ﻫﺮ ﭼﻨﺪ ﺗﺮكﻫﺎﯾﯽ در ﺑﺪﻧﻪ ﺳﺪ ﺑﻮﺟﻮد ﻣﯽآﯾﺪ اﻣﺎ ﺑﺎﻋﺚ ﺧﺮاﺑﯽ ﺳﺪ ﻧﻤﯽﺷﻮﻧﺪ و ﺗﻤﺎﻣﯽ ﭘﺎراﻣﺘﺮﻫﺎي ﺑﺪﺳﺖ آﻣﺪه در ﺣﺎﻟﺖ زﻟﺰﻟﻪ و ﺣﺎﻟﺖ ﻋﺎدي ﻗﺎﺑﻞ ﻗﺒﻮل ﻣﯽﺑﺎﺷﻨﺪ.

The present study investigates the stress and crack analysis in weighted concrete dams under constant acceleration resulting from earthquakes in the horizontal direction and induced earthquakes generated by the dam reservoir. This analysis was performed using CADAM software. The main purpose of stress calculations is to determine the amount of tensile length of the gap that is created by the inertial forces in the dam and the effect of these stresses on the stability of the concrete dam. CADAM software was developed in 2003 at the University of Montreal to analyze concrete dams in a variety of situations. In this paper, the gap and its effect on the stability of the concrete weight barrier with a maximum earthquake of 0.28 g were analyzed and the results were analyzed separately in each executive joint. In all joints, the minimum coefficient of safety against stability (at least 1.3) was obtained. Looking at the tables of results, it can be concluded that the stability of the regulating dam is suitable for acceleration of horizontal earthquake equal to 0.28 g. They are acceptable in earthquake and normal conditions.