Effect of cycles of drying and saturation on sub-base soils of MSW landfill (case study: Tehran Kahrizak region)
Subject Areas :
Naser Ebadati
1
(دانشگاه آزاد اسلامی واحد اسلامشهر)
Mohammad Drostkersary
2
(کارشناس ارشد خاک و پی شهرداری تهران)
Keywords: drying, Relative permeability, self healing, Cracking,
Abstract :
Waste control and its adequate disposal are included as a substantial problem in human life inthis world. So far vast studies have been carried out at in this regards, and several of self healingmethods have been common in practice. Since recovery of waste is not cost effective and is withthe technologic limitations, with respect to the mentioned reasons, the waste Land fill is ageneral solution. However, practically it is impossible to give or achieve a general solution. Anadequate Land fill is a place for waste Land fill which must be a location that don’t infect theenvironment in short term or long term. The most important problem is use of a method thatdoesn't let to waste emulsion to leak into the ground or to control it properly. In this research fordecrease of leakage of emulsion waste, two basic specifications that are less cracking and moreself healing for determination of the efficiency of soils application was analyzed. In this reasonchemical, mechanical and permeability test based on ASTM standard was perform on theKahrizak Landfill soil samples, and finally with respect to the obtained results from variouscycles of drying and saturation, the permeability coefficient was calculated. Permeabilitycoefficients in the end of 1st & 2nd cycles of drying and saturation divided by initialpermeability coefficient and also the relative permeability was included as the criteria of soilefficiency for application in impermeable layers. And whatever the relative permeability of soilclose to the 1, then this type of soil is ideal for using in this field also it was found that soils withless plasticity index have lesser cracks during drying.
