Analysis of Bearing Characteristics and Influencing Factors of Post Grouting Bored Pile at Pile End
In order to study the bearing characteristics and influencing factors of post grouting bored pile at the pile end,this article relies on a bridge foundation project using a composite post grouting technology at the pile end.Through on-site single pile static load tests,the settlement characteristics of the pile,as well as the distribution of axial force and lateral friction resistance,were analyzed.Based on the finite element method,the influence of different grouting amounts and grouting body strength on the bearing capacity of post grouting bored pile at the pile end was analyzed,The following conclusion is drawn:The axial force of the pile gradually decreases with the increase of depth,and the proportion of pile end load bearing continuously increases with the gradual increase of applied load.The lateral friction resistance of the pile roughly presents an"R"distribution,and the lateral friction resistance in the lower part of the test pile significantly increases.The post grouting process at the pile end has produced a strengthening effect on the lateral resistance near the pile end.As the radius and elastic modulus of the pile end expand,the bearing capacity and bearing capacity improvement ratio of the pile continue to increase.When the radius of the pile end expand is less than 1m or the elastic modulus of the pile end expand is less than 2000 MPa,the bearing capacity improvement ratio increases significantly.As the pile length increases,the bearing capacity and settlement values of ordinary cast-in-place piles and post grouting cast-in-place piles at the pile end show a continuous increasing trend,and the shorter the pile length,the greater the proportion of improvement in the bearing capacity of cast-in-place piles by post grouting technology.
bored pilepost grouting at the pile endbearing characteristicsnumerical calculation
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