竖向扩建填埋场变形离心模型试验研究  

Centrifugal model tests on stress deformation of plain-type landfills under vertical expansion

作　　者：李俊超[1,2] 朱斌[1,2] 杨春宝 王路君[1,2] 陈云敏 LI Jun-chao;ZHU Bin;YANG Chun-bao;WANG Lu-jun;CHEN Yun-min(MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;,Institute of Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China)

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学岩土工程研究所,浙江杭州310058

出　　处：《岩土力学》2018年第11期4071-4078,4085,共9页Rock and Soil Mechanics

基　　金：浙江省科技厅资助项目(No.2015C03021)~~

摘　　要：填埋场扩建是增大库容的重要手段,而其引起的沉降变形对填埋场及内部构筑物的稳定性有重大影响。针对扩建填埋场自重应力作用下的沉降变形问题,采用能够模拟我国固废工程特性的人工固废开展了平原型填埋场竖向扩建的离心模型试验。结果表明,堆体自重应力沉降随固废龄期增大而减小,最大沉降可达到堆体初始高度的20%。新老堆体界面不均匀沉降随老堆体龄期增大而减小,界面水平位移最大值出现在新堆体坡肩附近,且随坡比增加和龄期减小而增大。坡比越小,龄期和垃圾坝的作用越明显。垃圾坝对填埋堆体变形的影响随其相对高度减小而减弱。试验结果略大于常用的填埋场一维沉降计算结果,为填埋场增容及中间衬垫设计和稳定评估等提供了参考。Expansion is an important strategy to increase the capacity of a landfill, but the induced deformation by expansion can threat the stability of the landfill and its internal structure. Synthetic municipal solid wastes（MSWs） which exhibited engineering characteristics similar to MSW in China were developed, and a series of centrifugal model tests on the deformation of expanded plain-type landfill under self-gravity stress was performed. The settlement of landfill under self-gravity stress decreased as the MSW age increased with a maximum settlement of approximately 20% of the initial landfill height. Differential settlement of the interface between the old landfill and the new landfill decreased with the increase of old landfill MSW age. The maximum value of horizontal displacement on the interface occurred under the slope shoulder, and increased with the increase of slope ratio and decrease of filling age. The engineered berm restricted the settlement of the old landfill before expansion, but the settlement restriction was weakened as the height of landfill increased after expansion. It might induce large difference of the horizontal displacement on the interface. The results of the tests are slightly larger than those of one-dimensional settlement calculation of the landfill, and can provide reference for the expansion and liner system design, stability assessment and landfill operation.

关 键 词：城市固体废弃物 平原型填埋场 竖向扩建 离心模型试验 沉降变形 

分 类 号：TU411[建筑科学—岩土工程]