Study On Bearing Capacity Of Post-injecting Paste Bored Pile

The application of post - grouting Technology at the bored Pile-end has a well foreground. But now the post - injecting paste bored pile is obviously lagged behind project practice in the relation study between bearing capability and grouting's technical parameters and mechanisms research of improving its bearing capability. This thesis has systemically researched its bearing capability from model test,numerical simulation and theory analysis.According to the model test and field test , It has studied the P-S curves of post - injecting paste bored Pile with Limited bearing capability and settlement, stress and friction of pile body,soil stress distribution at pile's side and pile's end. The result of the test has verified that grouting parameters have very heavy influences to its bearing capability, And it has preliminary researched the relations of grouting parameters and bearing capability.Through numerical simulation, Post- grouting serous forced to squeeze into the bottom sediment piles and piles subsoil, pile-bearing layer of soil compaction reinforcement and the formation of the end of pile-expanding greatly enhanced pile-carrying capacity, thereby enhancing pile bearing capacity. post - injecting paste bored pile is compaction grouting. the cylinder can spread into grouting Theory and grouting pressure. post - injecting paste bored pile loads curve-settlement curve with ordinary pile, slowly varying curve type.It indicates that post - injecting paste bored pile bearing capacity is significantly increased .Through the researching on Grouted—in pile bottom with spherical (columnar) hole expansion theory considering material strain-soffening, the thesis proposes the method of counting the limit bearing capacity of the post - injecting paste bored Pile, and makes the contrast using this method computation limit supporting capacity and the test result, it indicates that this method can estimate the imit bearing capacity of the post - injecting paste bored Pile.The thesis offers a very kind reference and guide to the design and construction of the post - injecting paste bored Pile .