Numerical Analysis of Wall Deformation of PBFC Anti-seepage Slurry in Landfill
This research is based on an anti-seepage project of landfill in Jiangsu province, China. Finite element method in ANSYS is used to investigate numerically the stress and strain of diaphragm wall in the landfill. The pulp ratio of diaphragm wall is determ
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stract. This research is based on an anti-seepage project of landfill in Jiangsu province, China. Finite element method in ANSYS is used to investigate numerically the stress and strain of diaphragm wall in the landfill. The pulp ratio of diaphragm wall is determined by orthogonal experimental method. Results show that the maximum stress (absolute value) of the wall is only 0.24– 0.38 MPa and no tensile stress is produced with the wall. The maximum horizontal displacement is in the bottom of the wall with the value about 0.19% of the height of the wall. The maximum vertical displacement is in the top of the wall with the value about 2.5% of the thickness of the wall. In addition, no plastic deformation occurs in the diaphragm wall and the deformation of wall is proportional to that of its surrounding soil, which meets the operational requirements of landfill. Keywords: Landfills
Diaphragm wall Stress
1 Introduction For the vertical diaphragm wall in the landfill, the wall mainly bears the load of the gravity, the earth pressure and the water pressure, which enlarges the deformation of wall [1]. The wall does not crack during its service life, because the deformation modulus of the vertical diaphragm wall is close to that of surrounding soil. Thus, the deformation of the wall and the surrounding soil can be coordinated [2–4]. Experiments show that the concretion body of PBFC anti-seepage slurry has a good anti-seepage performance and the average permeability coefficient is about 0.53–1.86 10−8 cm/s. It can prevent effectively the diffusing of leachate to the surrounding soil [5]. And elastic modulus of the wall made of PBFC material is about 50–800 MPa. Its stiffness is also close to that of the surrounding soil. All these features lead the anti-seepage slurry to meet the requirements of mechanical impervious wall. This paper is based on an diaphragm wall of a landfill project in Jiangsu Province, China. The stress and deformation of the diaphragm wall is analyzed by ANSYS finite element software. The distributions of the maximum principal stress and the minimum principal stress are estimated accurately. The change law of horizontal displacement and vertical displacement is summarized. The results can provide theoretical basis for the design of vertical diaphragm wall around the landfill [6–8]. © Springer Nature Singapore Pte Ltd. 2018 L. Hu et al. (Eds.): GSIC 2018, Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, pp. 271–279, 2018. https://doi.org/10.1007/978-981-13-0095-0_31
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2 Engineering Survey and Calculation Parameter Selection 2.1
Engineering Survey
The landfill is in the alluvial plain of the Yangtze River Delta, which belongs to the floodplain terraces unit. The terrain of landfill is relatively flat, the natural ground elevation of the Yellow Sea is about 3.7–5.8 m and the average thickness of ground cover layer is 51 m. The maximum length of the landfill (East to West) is about 440 m and the maximum
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