Centrifuge Tests on the Instability of Valley-Type Municipal Solid Waste Landfill
Peng Ren, Hou Yujing, Chen Zuyu, Zhang Xuedong, Sun Qinglei and Yao Yangping
DOI:10.11835/j.issn.1674-4764.2014.06.011
Received May 05, 2014,Revised , Accepted , Available online July 01, 2015
Volume ,2014,Pages 67-72
- Abstract
The process of valley-type solid waste landfill sliding was simulated in centrifugal model test using container rotated during the centrifuge flight In the test, the displacement of the slope was measured and analyzed. The results showed that large deformation occured in the shoulder of the slope when the front slope angle and the back slope angle reached 40 degree and 45 degree respectively at centrifuge acceleration of 40g. The overall sliding appeared when the front and back slope angels were 51.6 degree, 56.6 degree respectively, and the interface slope angle at the bottom was 11.6 degree. With the increase of rotation angle of the model, the trend of overall sliding was accelerated and there was a large deformation of landfill body as well. The deformation perpendicular to the bottom of the slope was larger than that parallel to the bottom. When the model rotated 26 degree with the front and back slope angel of 66 degree, 71 degree, respectively，the interface slope angle at the bottom was 26 degree, and the failure mode changed from sliding inside the landfill to sliding along the internal interface slopes. The process of waste body sliding along the liner interface was recreated in the test and this process supported the method of choosing liner parameters in stability analyses. Based on measured data, the deformation and destruction characteristic were analyzed, and the main influence factors in selecting the waste shear strength parameter were discussed.