组合锤置换墩极限承载力计算方法

发布时间：2018-10-08 15:13

【摘要】：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.
[Abstract]:In order to study the bearing capacity of soft soil foundation strengthened by combined hammer replacement method, the calculation model of ultimate bearing capacity of replacement pier should be established and the feasibility of the calculation method should be verified. First of all, laboratory model tests are carried out to study the shape and failure mode of replacement piers. Secondly, on the basis of model test, the calculation model of the ultimate bearing capacity of displacement pier is established according to the energy method, and the model parameters are replaced. Based on the GA_PSO optimization algorithm, the influence of each parameter on the ultimate bearing capacity of the pier is studied on the Matlab platform. The results of test and calculation show that the typical piers of displacement piers are axisymmetric rotating bodies with vertical sections of trapezoidal sections of upper, larger and lower sizes, and the failure modes of piers under the limit state are bulging failure. The piers diameter and the soil strength around the pier have a significant influence on the ultimate bearing capacity of the pier body, which is consistent with the design idea of the combined hammer replacement method. Finally, an engineering case is given to verify the feasibility of applying this method to the preliminary design of the combined hammer replacement method.
【作者单位】：岩土及地下工程教育部重点实验室(同济大学);同济大学土木工程学院地下建筑与工程系;江西基业科技有限公司;
【基金】：国家自然科学基金(41272294) 上海市浦江人才计划(A类)(15PJ1408800)
【分类号】：TU470

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