Soil Arch Effect of Roadbed Pile Network Structure Based on Particle Discontinuous Deformation Method
Roadbeds of pile network have been widely used in railroads and highways construction in China due to their advantages such as short construction period and minimal settlement deformation.A discontinuous deformation analysis method(DDA)was used to study the mechanism and influencing variables of soil arch effect in the network roadbed.Nine different models were established by changing the roadbed height,inter-pile clearance and geogrid parameters.The results show these as follows.The numerical results are in good agreement with the experimental results,which verifies the feasibility of the discontinuous deformation analysis method in simu-lating the soil arch effect in the roadbed pile network structure.The influence of soil arch production becomes increasingly noticeable as the height of the roadbed rises,and the height of the equal sink surface stabilizes at 0.8～0.85 times the inter-pile clearance.The peak moment of the pile-soil stress ratio is clearly influenced by the net distance between piles;as this distance decreases,the pressure on the pile top receiving the load transfer from the roadbed rises and the peak speed of the pile-soil stress ratio accelerates.The reduc-tion of the net distance between piles will lead to the decrease of the height of the surface.The pile-soil stress ratio generated by the pile network structure after the addition of the geogrid is greater compared with that without the geogrid,indicating that the geogrid can effectively improve the strength of the roadbed.
discontinuous deformation analysisheight of roadbedinter-pile clearanceroadbed of pile networksoil arch effect
万方数据
维普
