摘要
以Swoers等沉降经验模型为基础,结合浙江大学针对高厨余的生活垃圾特性给出的中国生活垃圾堆体沉降计算方法,计算了竖向改建生活垃圾填埋场主、次压缩沉降量和不均匀沉降。对实际项目进行沉降监测,并分析了其压缩沉降特性。同时,收集了不同防渗材料力学特性,分析防渗材料在竖向改建生活垃圾填埋场工程应用的适用性。结果表明:主压缩沉降历时较短,而次压缩沉降历时长达30~50 a;压缩沉降与下层生活垃圾堆体深度、飞灰堆体高度呈非线性正比关系,随着深度和高度的增加,沉降速率变小。垃圾堆体堆填坡比是不均匀沉降的重要影响因素,建议飞灰堆体坡度缓于1∶3,以保证防渗衬层拉伸应变小于10%。在采取双向土工格栅、缓冲层等工程措施的情况下,可采用HDPE膜、土工布等材料组合为竖向改建的防渗衬层,不建议在竖向改建中使用钠基膨润土防水毯、黏土。
Based on the settlement experience model of Swoers and so on,a settlement calculation method of Chinese domestic waste landfills provided by Zhejiang University,combined with the characteristics of high-food-waste domestic waste,has been used to calculate the primary and secondary compression settlement,as well as the uneven settlement of vertical reconstruction of domestic waste landfills.The actual project settlements was monitored and compression settlement characteristics was analyzed.Additionally,the mechanical properties of different impermeable materials were collected to analyze their applicability in the engineering application of vertical reconstruction of domestic waste landfills.The results showed that the primary compression settlement had a short duration,while the secondary compression settlement lasted for 30 to 50 years.The compression settlement is nonlinearly proportional to the depth of the underlying domestic waste body and the height of the fly ash body,with the settlement rate decreasing as the depth and height increase.The landfilling slope ratio of the waste body is an important factor affecting uneven settlement,and it is recommended that the slope of the fly ash body be less than 1∶3 to ensure that the tensile strain of the impermeable lining is less than 10%.With the adoption of engineering measures such as bidirectional geogrids and buffer layers,combinations of materials such as HDPE membranes and geotextiles can be used as impermeable linings for vertical reconstruction,and the use of sodium bentonite waterproof blankets and clay in vertical reconstruction is not recommended.
作者
张宗建
周锋
卜庆国
张姣
ZHANG Zongjian;ZHOU Feng;BU Qingguo;ZHANG Jiao(CECEP(Beijing)Energy Conservation and Environmental Protection Engineering Co.Ltd.,Beijing 100176;CECEP(Longnan)Environmental Protection Energy Co.Ltd.,Ganzhou Jiangxi 341706)
出处
《环境卫生工程》
2025年第2期110-116,共7页
Environmental Sanitation Engineering
关键词
填埋场
竖向改建
压缩沉降
不均匀沉降
防渗衬层
landfill
vertical reconstruction
compression settlement
uneven settlement
impermeable lining
