垃圾填埋场中间覆盖层在垃圾分区或分层堆填作业过程中用于临时封闭垃圾堆体、控制降雨入渗并减少蚊蝇滋生和臭气等.常用的高密度聚乙烯(high density polyethylene,HDPE)膜作为中间覆盖层,存在易被垃圾刺穿导致坡面雨水大量入渗和造价...垃圾填埋场中间覆盖层在垃圾分区或分层堆填作业过程中用于临时封闭垃圾堆体、控制降雨入渗并减少蚊蝇滋生和臭气等.常用的高密度聚乙烯(high density polyethylene,HDPE)膜作为中间覆盖层,存在易被垃圾刺穿导致坡面雨水大量入渗和造价较高等问题.我国西北地区气候干旱且黄土分布广泛,这些黄土是当地制作垃圾填埋场中间覆盖层非常便利的材料.对黄土中间覆盖层的夯实施工、防渗性能和历经干湿循环作用后开裂导致其渗透系数增大、防渗性能劣化进行了试验研究.结果表明:黄土的饱和渗透系数随干密度增大而增大,当干密度达到1.60 g/cm3时其渗透系数为10-7～10-6cm/s,防渗性能较好;现场双套环原位实验测得黄土饱和渗透系数为8.37×10-8cm/s,较室内试验大1倍左右;黄土层历经自然干湿循环作用后易开裂,有裂缝条件下其饱和入渗系数为1.18×10-6cm/s,比无裂缝条件下的增大了14倍左右.在增设15 cm厚的保护植被土层后,黄土的开裂情况得到明显抑制.展开更多
A field monitoring program was carried out to record the slope failure process of a landfill with multiple intermediate covering layers.The monitored items include the leachate level,the surface horizontal displacemen...A field monitoring program was carried out to record the slope failure process of a landfill with multiple intermediate covering layers.The monitored items include the leachate level,the surface horizontal displacement and the deep lateral displacement.Based on the monitoring data,analysis was carried out to verify the stability control effects of leachate drainage on the top layer,leachate drainage in different layers,and near-slope leachate drainage.The results show that the maximum slip area is 34 760 m 2 and the average surface horizontal displacement of the 10th platform is 1.77 m.Dumping near the slope is the main reason for the instability.The closer to the dumping area,the greater the degree of slip and the more significantly the leachate level rises.Affected by the intermediate covering layers,the failure mode is the local sliding inside the landfill,and the effect of near-slope leachate drainage on the stability control is obvious.展开更多
文摘垃圾填埋场中间覆盖层在垃圾分区或分层堆填作业过程中用于临时封闭垃圾堆体、控制降雨入渗并减少蚊蝇滋生和臭气等.常用的高密度聚乙烯(high density polyethylene,HDPE)膜作为中间覆盖层,存在易被垃圾刺穿导致坡面雨水大量入渗和造价较高等问题.我国西北地区气候干旱且黄土分布广泛,这些黄土是当地制作垃圾填埋场中间覆盖层非常便利的材料.对黄土中间覆盖层的夯实施工、防渗性能和历经干湿循环作用后开裂导致其渗透系数增大、防渗性能劣化进行了试验研究.结果表明:黄土的饱和渗透系数随干密度增大而增大,当干密度达到1.60 g/cm3时其渗透系数为10-7～10-6cm/s,防渗性能较好;现场双套环原位实验测得黄土饱和渗透系数为8.37×10-8cm/s,较室内试验大1倍左右;黄土层历经自然干湿循环作用后易开裂,有裂缝条件下其饱和入渗系数为1.18×10-6cm/s,比无裂缝条件下的增大了14倍左右.在增设15 cm厚的保护植被土层后,黄土的开裂情况得到明显抑制.
基金The National Basic Research Program of China(973Project)(No.2012CB719800)the National Natural Science Foundation of China(No.41502276)
文摘A field monitoring program was carried out to record the slope failure process of a landfill with multiple intermediate covering layers.The monitored items include the leachate level,the surface horizontal displacement and the deep lateral displacement.Based on the monitoring data,analysis was carried out to verify the stability control effects of leachate drainage on the top layer,leachate drainage in different layers,and near-slope leachate drainage.The results show that the maximum slip area is 34 760 m 2 and the average surface horizontal displacement of the 10th platform is 1.77 m.Dumping near the slope is the main reason for the instability.The closer to the dumping area,the greater the degree of slip and the more significantly the leachate level rises.Affected by the intermediate covering layers,the failure mode is the local sliding inside the landfill,and the effect of near-slope leachate drainage on the stability control is obvious.
