Research On The Change Regulation Of Pile Bearing Capacity And Soil Displacement In Static Pressure Pile Sinking

With the development of China’s reform and opening up and urbanization process,urban land use has become increasingly tense,how to reduce the impact on the dense urban areas’ environment during construction has become a major issue worthy of study.Static pile as the precast pile,it has reliable pile quality,relatively low prices,no noise,no vibration,no impact,small construction stress,thus having been widely used.But static pile also has its drawbacks,it is that it belongs to dump replacement pile,the soil compaction effect produced in the process of pile penetration affects the surrounding environment adversely.This paper combines with the static pressure pile construction of soft soil foundation engineering in China resources power co.,LTD,and uses FLAC2 D software to simulate sinking static pile,sinking pile realized by displacement control method,analyzing the force of whole process of the sinking pile.The results show that the process of sinking pile is mainly supported to vertical stress,especially late sinking pile on top of pile subjected to vertical stress greater.We use single factor control method on various factors that affect the force of the pile,and analyze the friction angle,cohesion,pile sharp corner and pile diameter affecting the relevance and sensitivity.Static pile belongs to dump replacement piles,and soil compaction effects produced in the pile penetration process to adversely affect the surrounding environment.Based on the analysis of single pile model,this paper studies the displacement of soil in the process of pile sinking.The results show that the radial displacement was logarithmic decay with the radial distance increased.The vertical displacement within a certain range of soil from surface is the uplift,soil subsidence below the depth,and the maximum vertical displacement is achieved in the range of 2~3 m.The soil radial displacement between two piles is smaller compared to the case of a single pile,but the vertical displacement increased significantly.Study on the pile bearing capacity of pile and variation law of the soil around in the process of the pile sinking,can be selected the construction method according to the engineering situation,and avoid the emergence of engineering problems.To provide theoretical basis for the construction of effective engineering measures and reduce the impact of the pile on the environment,and it has important practical significance.