垃圾填埋场PBFC防渗浆材性能与墙体变形分析

In view of the complex composition, high concentration and strong pollution for leachate of domestic waste landfill site,through the experiment,PBFC slurry with low permeability coefficient and with effect of adsorption retardation to pullutants in leachate for domestic waste landfill site are developped.This slurry has a concretion stone ratio greater than 99.6%, concretion body for 28 day and coefficient of permeability less than 1×10-7cm/s, compressive strength between 0.5～2.0MPa. The concretion body of the slurry blocks CODCr, BOD5、NH4-N and phosphorus adsorption at a rate above 85% and Hg, Pb and other heavy metal ions at a rate above 99%. The grouting concretion body performs good instability and durability in acidic liquid and leachate, its plasticity and toughness are very well, adapted to the distortion of the base for domestic waste landfill site.Useing simulating penetration test, carry on research of filtration deposition of anti-seepage slurry with a low permeability coefficient, as well as the adsorption retardation mechanism of bentonite and fly ash to leachate pollutants. Combined with specific landfill engineering, carry on research of mechanical properties on seepage control wall grouting material, built with high accuracy mathematical model on stress strain relation for waste landfill site isolation wall.

针对生活垃圾填埋场渗滤液成分复杂、浓度高、污染性强等特点，通过实验研制出低渗透性、对垃圾填埋场渗滤液等污染物具有吸附阻滞作用的PBFC型防渗浆材；该浆材结石率大于99.6%，固结体28d渗透系数小于1×10-7 cm/s，无侧限抗压强度为0.5～2.0MPa；浆材固结体对CODCr、BOD5、NH4-N、TP、SS等阻滞率达到85%以上，对Hg、Pb等重金属离子阻滞率在99%以上；浆材结石体耐酸性液体和垃圾场渗滤液的侵蚀，耐久稳定性强，塑性和韧性好，与垃圾填埋场的地基变形相协调。采用模拟渗透试验进行防渗浆材低渗透系数的渗滤沉积作用和膨润土、粉煤灰对渗滤液等污染物的吸附阻滞作用机理的研究。结合垃圾填埋场具体工程，进行防渗墙体浆材结石体力学特性的研究，建立起具有较高符合度的墙体应力-应变关系数学模型。

针对生活垃圾填埋场渗滤液成分复杂、浓度高、污染性强等特点，通过实验研制出低渗透性、对垃圾填埋场渗滤液等污染物具有吸附阻滞作用的PBFC型防渗浆材。该浆材结石率大于99.6%，固结体28d渗透系数小于1×10-7 cm/s，无侧限抗压强度为0.5～2.0MPa；浆材固结体对CODCr、BOD5、NH4-N、TP、SS等阻滞率达到85%以上，对Hg、Pb等重金属离子阻滞率在99%以上。浆材结石体耐酸性液体和垃圾场渗滤液的侵蚀，耐久稳定性强，塑性和韧性好，与垃圾填埋场的地基变形相协调。结合模拟渗透试验，进行PBFC防渗浆材渗滤沉积作用和对渗滤液等污染物吸附阻滞作用的研究，研究了渗滤液中重金属污染物在浆材结石体中迁移规律。开展了PBFC防渗浆材固结体力学特性的研究，结合垃圾填埋场具体工程，采用有限元分析的方法，进行PBFC防渗浆材固结体（塑性防渗墙）非线性应力变形数值分析，建立起符合度较高的墙体应力-应变关系数学模型。所研发的气压式生活垃圾填埋场渗滤仪，可通过宏微观试验揭示PBFC防渗墙浆材的抗渗、吸附阻滞机理。通过有限元数值分析，得出了墙体位移、应力、变形、渗透比降等变化规律，可为垃圾填埋场防渗工程设计和施工提供依据。