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为研究组合锤置换法加固软土地基的承载性能,需建立置换墩的极限承载力计算模型并验证该计算方法的可行性.首先,进行室内模型试验,研究置换墩墩体形态和墩体破坏模式.其次,在模型试验的基础上,根据能量法建立置换墩极限承载力的计算模型,代入模型相关参数,基于GA_PSO优化算法在Matlab平台研究各参数对墩体极限承载力的影响.试验和计算结果表明:置换墩典型的墩体形态为一轴对称的旋转体,纵向剖面为上大下小的梯形截面;极限状态下墩体的破坏模式为鼓胀破坏;墩径和墩周土体强度对提高墩体极限承载力影响显著,此与组合锤置换法设计理念相吻合.最后,通过一工程案例,验证了该计算方法应用于组合锤置换法初步设计是可行的.
In order to study the bearing capacity of soft soil foundation by combining hammer replacement method, the calculation model of ultimate bearing capacity of replacement pier is established and the feasibility of this calculation method is verified.First, indoor model test is conducted to study the morphology of pier pier body and damage of pier body Model.Secondly, based on the model test, the calculation model of the ultimate bearing capacity of the pier was established based on the energy method, and the relevant parameters of the model were substituted into the model, and the influence of parameters on the ultimate bearing capacity of the pier was studied based on the GAOPSO optimization algorithm. The calculation results show that the typical pier body of the replacement pier is an axisymmetric rotating body, and the longitudinal section is a trapezoidal cross section with a large upper and a lower lower part. The failure mode of the pier body in the ultimate state is bulging and destroying. The pier diameter and the soil strength around the pier Which has a significant impact on improving the ultimate bearing capacity of piers, which is consistent with the design concept of the combination hammer replacement method.Finally, through a project case, it is validated that the calculation method applied to the preliminary design of the combination hammer replacement method is feasible.