混凝土扩盘桩盘截面形式对桩周土破坏影响的试验研究

EXPERIMENTAL RESEARCH ON THE INFLUENCE OF THE PLATE SECTION FORM OF CONCRETE EXPANDED-PLATE PILE ON THE FAILURE STATE OF THE SOIL AROUND PILE

在对混凝土扩盘桩桩周土破坏机理影响因素的研究中,盘的截面形式是主要因素之一。针对施工机具成桩工艺形成的实际桩截面形式与理论分析中理想桩截面形式的差异,研究对桩周土体破坏状态的影响,通过不同盘截面形式半面桩原状土模型试验,观察从加载到破坏的全过程,分析破坏状态的差异,为完善混凝土扩盘桩的单桩承载力计算方法提供可靠的理论依据。

In the study about influence factors for failure mechanism of the soil around the concrete expanded-plate pile (the CEP pile),the section form of plate is one of the main factors.Based on the differences between the actual pile section form formed by the pile-forming process and the ideal pile section form in theoretical analysis,the paper studies the influence of section form of plate on the failure state of the soil around pile.Through the test of half- section pile with different plate sections in undisturbed soil,the whole process from loading to failure was observed and the difference of failure state was analyzed for different section form of plate,which could provide a reliable theoretical basis for optimizing the calculation method of single pile bearing capacity of concrete expanded-plate pile.