title: Geotechnical properties of municipal solid waste at Laogang Landfill, China.
abstract: Landfills have been widely constructed all around the world in order to properly dispose municipal solid waste (MSW). Understanding geotechnical properties of MSW is essential for the design and operation of landfills. A comprehensive investigation of geotechnical properties of MSW at the largest landfill in China was conducted, including waste composition, unit weight, void ratio, water content, hydraulic conductivity, and shear behavior. A large-scale rigid-wall permeameter and a direct-shear apparatus were adopted to test the hydraulic conductivity and shear behavior of the MSW, respectively. The composition of the MSW varied with age. With the depth increasing from 0 to 16m, the unit weight increased from 7.2 to 12.5kN/m3, while the void ratio decreased from 2.5 to 1.76. The water content ranged between 30.0% and 68.9% but did not show a trend with depth. The hydraulic conductivity of the MSW ranged between 4.6×10-4and 6.7×10-3cm/s. It decreased as the dry unit weight increased and was sensitive to changes in dry unit weight in deeper layers. Displacement-hardening was observed during the whole shearing process and the shear strength increased with the normal stress, the displacement rate, and the unit weight. The friction angle and cohesion varied from (15.7°, 29.1kPa) to (21.9°, 18.3kPa) with depth increasing from 4 to 16m. The shear strength of the MSW obtained in this study was lower than the reported values in other countries, which was caused by the less fibrous materials in the specimens in this study. The results in this study will provide guidance in the design and operation of the landfills in China.
authors.affiliation: Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China. Electronic address: fsjgly@tongji.edu.cn.
authors.forename: Shi-Jin
authors.initials: SJ
authors.lastname: Feng
authors.affiliation: College of Civil Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Ke-Wei
authors.initials: KW
authors.lastname: Gao
authors.affiliation: College of Civil Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Yi-Xin
authors.initials: YX
authors.lastname: Chen
authors.affiliation: College of Civil Engineering, Tongji University, Shanghai 200092, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong.
authors.forename: L M
authors.initials: LM
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China.
authors.forename: H X
authors.initials: HX
authors.lastname: Chen
mesh_terms: D002681:China; D055585:Physical Phenomena; D012037:Refuse Disposal; D033081:Shear Strength; D062611:Solid Waste / Q000032:analysis*; D064091:Waste Disposal Facilities; D014867:Water
chemical_list: D062611:Solid Waste; D014867:Water
keywords: Geotechnical properties; Hydraulic conductivity; Landfill; Municipal solid waste; Shear strength