Study On Reinforced Chemical Churning Pile Application In Deep Foundation Pit

Reinforced Chemical Churning Pile is in recent years engineering appeared in a new form of foundation pit supporting structure,It is in the foundation pit supporting pile construction field over the narrow or under the condition of boundary is not enough,Rely on chemical churning pile machine work highly low,take up the characteristics of few sites, Creative in chemical churning pile up in foundation pit supporting structure profiles. Now, the reinforcement way already diversification, The design has not formed norms and theoretical aspects of research appear lesser also. In this paper, the science city of guangzhou, ke xiang road tunnel engineering electric power in double row reinforcement chemical churning pile design and construction as the background, For such forms of retaining piles for research, Main content and the results are as follows:(1)Through the high pressure chemical churning pile into the pile fromation mechanism, Analyzes reinforcement chemical churning pile profile and the combination of cement-soil effect, also clear the combination effect of the calculation principle.(2) SMW method according to pile the built-in small radius mixing pile in the form of reinforcement chemical churning pile design and calculation, Single row reinforcement chemical churning pile all safety coefficient satisfies the design specifications, Can be used as a design of a kind of method to check.(3) By FLAC-3 D on the double row of reinforcement chemical churning pile foundation pit excavation was simulated, Clear the foundation pit excavation process double row of mechanical characteristics of steel pipe, surrounding the soil mass displacement of foundation pit in form. In the calculation of the foundation, on the reinforcement chemical churning pile length, the optimization results show that reasonable pile length for 12 m. In addition to the foundation pit surrounding soil consolidation method, and concludes that the optimization of foundation pit basal reinforcement stable the most advantageous.(4)Combining with the construction monitoring data, The form of different support horizontal displacements of the soil foundation are analyzed, At the same time, comparisons the monitoring data, design calculation and simulation results, In order to verify the reliability of the design results.