Base Research on Solid Waste Pressure Transmission in Solid Waste Landfill

Takayuki Shimaoka*, So Takezaki*, Takeshi Ohyama*, Masataka Hanashima*, Takao Hirai** and Kuninori Mizuta***

* Department of Civil Engineering, Faculty of Engineering, Fukuoka University
** Research Laboratory, Mitsui Petrochemical Industrial Products Ltd.
*** Civil Engineering Materials Section, Mitsuboshi Sangyo Co., Ltd.

+ Correspondence should be addressed to Takayuki Shimaoka: Faculty of Engineering, Fukuoka University
(8-19-1 Nanakuma, Johnan-ku, Fukuoka 814-0180 Japan)

Abstract

The forces within solid waste landfill must be understood in determining the stability of the foundation ground, structure and solid waste landfill at final waste disposal sites. In particular, pressure from solid waste that forms its structure is important in rationaly designing that structure. In this research, experiments were conducted on the pressure from bottom ash, incombustible shredded solid waste and mixed solid waste, by using two test apparatuses for measuring earth pressure different forms of foundation. The purpose has to define the pressure transmission mechanism of solid waste landfill. It was found that the horizontal pressure was not proportional to the load pressure in certain types of waste, while vertical pressure from the solid waste showed differences in forms of distribution for each type of waste. Unlike earth pressure, the solid waste pressure fluctuated over time and did not show any distinct active state. The coefficient of stationaly solid waste pressure ranged between 0.38 and 0.46 for bottom ash, between 0.27 and 0.38 for incombustible shredded solid waste and between 0.34 and 0.62 for mixed solid waste. It was also found that these coefficients could not be estimated from the classification based on the grain size distribution of the solid waste. The effectiveness of Poisson's ratio concept in successfully explaining the pressure special characteristics of the transmission was demonstrated.

Key words: landfill, solid waste landfill, solid waste pressure, transmission of pressure, the coefficient of solid waste at rest