| 卫生填埋场防渗层工作性能的数值模型研究 |
| |
| 引用本文： | 刘庭发,张鹏伟,胡黎明.卫生填埋场防渗层工作性能的数值模型研究[J].地震学刊,2012(5):617-623. |
| |
| 作者姓名： | 刘庭发 张鹏伟 胡黎明 |
| |
| 作者单位： | 清华大学水沙科学与水利水电工程国家重点实验室、清华大学水利水电工程系,北京100084 |
| |
| 基金项目： | 国家重点基础研究发展计划（973）课题（2012CB719804）资助 |
| |
| 摘 要： | 粘土衬垫的防渗性能和吸附阻滞性能对卫生填埋场防渗系统工作性能有着重要影响。通过建立一维对流-弥散模型,分析了渗透系数、扩散系数、入渗强度、吸附能力对渗漏量及衬垫击穿时间的影响。考虑实际工程的复杂性,建立能反映土体分层、土体非均质性、地下水运动及宏观弥散等复杂因素影响的污染物运移二维分析模型,并对各参数的敏感性进行分析。计算结果表明,保持填埋场在低渗滤液水位下运行,对提高衬垫的防渗效果及耐久性有重要意义;受材料本身性质、施工质量等因素的影响,粘土衬垫的渗透系数变异性往往较大,渗透系数提高一个数量级时,衬垫击穿时间显著缩短;渗透系数恒定时,衬垫击穿时间与材料阻滞因子成线性变化关系;地下水分布及运动情况对污染物运移及分布有重要影响,地下水位越低,竖向入渗越明显,入渗区下部土体的吸附性能发挥越充分,到达地下水及下部土体的污染物浓度越低。
|
| 关 键 词： | 卫生填埋场 入渗强度 击穿时间 吸附性能 宏观弥散度 污染物运移 数值分析模型 |
Numerical Model Study on Working Performance of Seepproof Liner in Sanitary Landfill |
| |
| LIU Ting-fa,ZHANG Peng-wei,HU Li-ming.Numerical Model Study on Working Performance of Seepproof Liner in Sanitary Landfill[J].Journal of Seismology,2012(5):617-623. |
| |
| Authors: | LIU Ting-fa ZHANG Peng-wei HU Li-ming |
| |
| Institution: | (State Key Laboratory of Hydro-Science and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China) |
| |
| Abstract: | The anti-seepage and absorption ability of clay layer are main factors influencing landfill liner working performance. A 1D convection-dispersion model was proposed to analyze the influence of perme- ability coefficient, diffusion coefficient, infiltration intensity, and absorption ability on the breakthrough time and leaching quantity. A 2D numerical model considering soil stratification, inhomogeneity, under- ground water motion and macro-dispersivity was introduced to reflect practical complex conditions, and pa- rameter sensitivity analysis was conducted. The results show that keeping a relatively low leachate head is of great importance to obtaining well anti-seepage performance and durability of clay liner. The permeabil- ity eoeffisient of clay liner varies within extensive range because of variation in material character and qual- ity control during construction and the breakthrough time decrease sharply when the permeability coeffi- cient increase by one order of magnitude. A nearly linear relation between breakthrough time and retardation factor can be obtained when the permeability keeps constant. Underground water can severely influ- ence the transportation and distribution of pollutant. The results show that pollutant transport occures mainly in vertical direction when the water level is low. The pollutant concentration in lower layer soil and underground water is much lower because of intense absorption in unsaturated soil above the water level. |
| |
| Keywords: | sanitary landfill~ infiltration intensity breakthrough time absorption performance macrodispersivity pollutant transport numerial model |
| 本文献已被 维普 等数据库收录！ |
|
