Research On The Temperature And Humidity Coupling Effect On The Granite Eluvial Soil Embankment In Fujian Province

The passive-pile problem often occurs because of soil lateral movement due to roadbed construction or bridge abutment construction and so on. The carrying capacity of close-by piles decreases badly under passive load, especially in the bridage construction, which gives us much lesson in recent years.The large surcharge load adjacent to bridges can have a great effect on behavior of piles. First, large settlement of soil beside piles due to the surcharge load can cause negative skin friction of piles. Second, lateral deformation of soil extrude the adjacent piles and cause lateral and deflection deformation of piles. The load on top of piles interact with negative skin friction and lateral extrusion influence the behavior of piles, which can cause additional bending moment and shear stress to lead to pile fracture. This paper uses numerical simulation methods and the actual project to discuss the behavior of vertical loaded piles influenced by side surcharge.(1) Pile loading and thickness of soft soil layer have a significant effect on pile displacement while the size of the Bridge Structure and load on the pile have a certain influence on it. This results that pile displacement is directly related to the settlement of soft soil along pile.(2)The heaped loads、location pile body elastic modulus、clearance height and load on the pile have a great impact on the pile stress. The stress of tie beam consentrates both on the left side of soft soil along left pile and right pile and the right side of the force bearing layer junction of both pile bottom.(3) The moment of pile is affected greatly with heaped loads、location、pile length、pile body elastic modulus、clearance height、tickness of soft soil layer and load on the top of pile. Moment is larger below the soft soil layer about 10m or so and where the pile bottom embedded into force-hearing layer.secondly, This paper focus on the heaped loads on six piers of Fuzhou Minhou Jing Xi Bridge, build certain model by related Drilling data and design files. The result of calculation reveals that the larger displacement is observed on the 69-th pier, which is up to 5.4cm. as a result, this paper put forward some layout of reinforcement and treatment measure according to bridge Strengthening design specification. thereby, some prevention measures are put forward n allusion to the heaped loads on the soft soil nearby the pies and insist that compound foundation method can most effective prevent the development of the displacement along the piers. while, the method of unload, exchange the soil, shelter pile and Pile foundation reinforcement is fit for lesser heaped loads and smaller displacement on the piers merely To Reduce the impact of heaped loads on the piers obviously, the most essential measure is to improve the carrying capacity of soft soil and reduce the settlement of soft soil along pile and alleviate the transformation influence of the soft soil on piers of the bridge.