MECHANICAL PROPERTIES AND CAPACITY EXPANSION ANALYSIS OF BACKFILL SOIL IN ENGINEERING MUCK FIELD

The unreasonable storage capacity design can lead to a low utilization rate of site storage capacity. The simple dumping measures adopted at present would also cause potential safety hazards such as collapse and landslide. This paper aims to explore reasonable landfill method,increase landfill capacity and prevent safety accidents. This paper studies the capacity utilization of Lijia'ao landfill site in Longwei District of Wuzhou City for 4 years. The mechanical properties of engineering muck are studied by in-situ test and laboratory test. The process of filling is simulated by 3D geological modeling and LANDFILL. The site is calculated by LANDFILL and Sowers consolidation model. The settlement and capacity change are compared and analyzed. The results show that:(1)the composition of engineering muck is uneven due to the large disturbance,and are mainly composed of sandy fine grain soil(CLS) and low liquid limit clay(CL)in the half-saturated and-saturated states; (2)the engineering muck are mostly in fluid-plastic state and soft-plastic state,with low compacting degree and low average foundation bearing capacity; (3)the simulation results show that the expansion rate can be increased from 8.9%to 25.1%after the drainage measures and the landfill technology are improved. The capacity can be effectively improved; (4)compared with the model,the error value of landfill software settlement calculation is smaller,and the average error is less than 4.5%,which shows that the calculation of landfill settlement by LANDFILL is more practical. The research results provide both data and engineering references for the expansion design,safe operation and landfill construction of engineering muck field.