标题: 渗流状况对于废弃物掩埋场稳定性之影响
Effect of Leachate Seepage on Stability of Landfills
作者: 单信瑜
SHAN HSIN-YU
国立交通大学土木工程学系(所)
关键字: 掩埋场;渗出水;边坡稳定;Landfill;Leachate;Seepage;Slope Stability
公开日期: 2008
摘要: 废弃物掩埋场设置渗出水集排水系统(Leachate collection system, LCS)之目的为收集渗
出水,输送至渗出水处理厂进行处理后排放或返送(Recirculation)。目前台湾采取渗出水
返送的掩埋场有一百三十余场,其中有些掩埋场周边雨水截流系统已经破坏、有些渗出
水收集系统已经堵塞,但这些掩埋场并未评估渗出水淤高后对于边坡稳定之影响。这些
掩埋场中有一半为山坡地掩埋场,因此评估渗出水淤积状况以及边坡稳定状态为当务之
急。本研究将以美国掩埋场设计通用之水文平衡分析模式HELP 针对假设之山坡地掩埋
场进行模拟,再将其结果利用SEEP/W与FEMWATER 进行场内渗出水渗流模拟,最后
以SLOPE/W进行边坡稳定分析,以完整瞭解掩埋场渗出水集排水系统效能与其他条件
对于渗出水淤积以及边坡稳定之影响程度。因HELP 在模拟时可考量气象、水文、植生、
排水以及场内各层之导水与贮水性质,故可以极为精确地估算掩埋场内各层所贮留与排
放之水量。利用HELP 所得之结果,则可作为SEEP/W或FEMWATER 模拟时之输入条
件,以进一步掩埋场内渗出水淤积水位之分布。本研究亦将透过系统参数之变化,探讨
降低渗出水导致边坡破坏风险之可行方法。本研究亦将针对二至三场山坡地掩埋场,利
用实际资料进行分析,以评估推广应用之可行性。
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landfills in Taiwan adopted outdated LCS design and thus most of the LCS systems suffer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
官方说明文件#: NSC97-2221-E009-125
URI: http://hdl.handle.net/11536/102765
https://www.grb.gov.tw/search/planDetail?id=1686529&docId=290733
显示于类别:Research Plans


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