Effect of Leachate Seepage on Stability of Landfills
|摘要:||廢棄物掩埋場設置滲出水集排水系統(Leachate collection system, LCS)之目的為收集滲
放之水量。利用HELP 所得之結果，則可作為SEEP/W或FEMWATER 模擬時之輸入條
Leachate collection systems (LCSs) are designed to efficiently remove leachate from solid waste landfills. This prevents ponding of the leachate on the liner system, thus minimizing leachate migration to the environment. The potential of LCS drainage materials (sand, gravel, and geotextiles) to clog as a result of biological growth and particulate clogging is an important issue that should be addressed in landfill design. However, almost all of the landfills in Taiwan adopted outdated LCS design and thus most of the LCS systems suffer from clogging. On the other hand, leachate recirculation is used in most of these landfills to achieve zero discharge since the leachate treatment plant of these landfills had failed due to lack of proper maintenance. More than 70 such landfills are located in mountainous areas such that the reduced slope stability as a result of the elevated leachate level should be a major concern for the regulatory agencies and the public. The objective of this research is to study the effect of clogged LCS on the risk of slope failure of landfills. The research proposed using HELP, which is a hydrological balance model for landfill design in the United States, to compute the water balance in all the layers in the landfills as a first step. The resulted water balance data will then be processed as the initial and boundary conditions for groundwater simulation model SEEP/W and FEMWATER used to compute the distribution of leachate head in the landfill. Consequently, the slope stability will be analyzed with the 2D slope stability software, SLOPE/W, to access the factor of safety of critical leachate distribution. The research will also study the effectiveness of the alternatives of reducing leachate generation or leachate removal on improving the slope stability. The study will also include modeling 2 to 3 actual mountainous landfills in Taiwan to access the feasibility of widespread application of the proposed analytical procedures
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