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Sotoudeh Y.,University of jabber ebne hayan | Samsami S.,University of jabber ebne hayan | Mohammad Alipoor A.,University of jabber ebne hayan | Amoei E.,University of elm o farhang | Najafi Moghaddam V.,Islamic Azad University
Advances in Environmental Biology | Year: 2013

Cavitation phenomenon is very important and at the same time damaging the hydraulic structures such as dams overflow is considered This is the phenomenon that occurs when the vapor pressure is less pressure on the spillway structure. This event caused severe damage to the spillway structure and the dam and will adversely affect performance. Among the important parameters involved in the occurrence of this phenomenon can be flow rate, flow pressure, Strength of materials forming the spillway structure and the amount of air flow over the spillway. Therefore, in this study, we have investigated the phenomenon of cavitation in hydraulic structures, The role of cavitation index and how to use it to control the occurrence of cavitation in spillovers is discussed. In this method, the index of the critical cavitation, cavitation index is greater than the risk of overflow, this rule is somewhat insignificant. Therefore, in this study, we have investigated the phenomenon of cavitation in hydraulic structures, The role of cavitation index and how to use it to control the occurrence of cavitation in spillovers is discussed.


Sotoudeh Y.,University of jabber ebne hayan | Salehi M.,University of jabber ebne hayan | Moradzadeh S.,University of jabber ebne hayan | Taghipoor H.,University of jabber ebne hayan | Behboodi M.,University of jabber ebne hayan
Advances in Environmental Biology | Year: 2013

When there is a need to build a lot of buildings and housing, the bulk of the industrial practices of planning, managing and coordinating the development of related industries is available. One of the systems in large industrial tunnel form system In this paper, the use of concrete in construction of the system is discussed. Characteristics, capabilities and limitations of the architecture of the system and the behavior of the structure against earthquakes, fire and sound insulation scheme has been studied. According to studies of the economic tunnel system running fast and clump that causes small projects can not be justified. System shows, the durability and resistance to seismic well and suitable resistance to moisture. But freedom is less than some of the systems architecture. System also requires special equipment and skilled labor force is not suitable for use in remote areas with no facilities.

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