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| Research on the Soil Arching Effect in Pile Net Structure of Embankment under Static Load and Dynamic Load |
| WEI Ping1，WEI Jing1，YANG Song - lin1，ZHANG Dong1，TAO Sheng2 |
| (1. Beijing Jiaotong University，Beijing 100044，China; 2. Beijing Polytechnic College，Beijing 100042，China) |
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Abstract Abstract ： Research purposes ： To investigate the formation mechanism and mechanical characteristics of soil arching effect within pile net structure in embankment under train load，discrete element model of pile net structure is found by PFC3D software for mesoscopic research，the chain of contact force，the horizontal and vertical displacement，and vertical distribution of soil particles stress are analyzed in this paper. Research conclusions ：( 1) The soil stress between piles is increased and the soil arching effect is weakened by dynamic load. (2 ) Most of dynamic load is pased to the top of pile because of dynamic soil arching formation. ( 3 ) The formation of equal settlement surface is associated with the displacement arch，because the soil particles will run into the area between piles from the area on the top of piles within thedisplacement arch，which leads to a higher vertical displacement on the top of piles outside displacement arch and a lower soil vertical displacement between piles. (4) It will lower soil arch height and weaken virtual soil arches among stress arch if the geogrid cushion is put into use，but the pile - soil stress ratio is increased. ( 5 ) This research results will provide method of working mechanism for railway roadbed Ntructure.
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Received: 05 January 2017
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2017, Vol. 34 
