软土地基中壁桩框架码头结构受力分析及稳定性计算方法
Mechanical Analysis and Stability Calculation Methods for Wharfs of Pile Wall Frame Structure in Soft Soil Foundation

针对适用于软土地基的壁桩框架码头结构, 对其稳定机理进行分析, 并提出设计计算方法．结合壁桩框架结构自身特点, 提出非均质土体中截桩力计算方法, 并考虑排距对截桩力的影响．在此基础上建立该结构的水平抗滑、抗倾、整体圆弧滑动稳定性及桩基竖向承载力的分析模型和计算方法．通过工程试验对壁桩框架码头结构及其稳定性计算方法的应用可行性进行验证, 并研究了排距、桩长、桩径和桩间距等因素对稳定性的影响．结果表明, 试验工程的最不利滑动面经过桩身、位于抗剪强度指标较弱的地基土底面, 增大排距可有效提高结构的稳定性．所提出的计算方法能够合理地反映壁桩框架码头结构的稳定机理, 为该结构的工程应用提供参考依据．
The stability mechanism was analyzed for wharfs of pile wall frame structure，a structure applied to soft soil foundation，to put forward the corresponding design calculation method. Combined with the characteristics of pile wall frame structure，the calculation method of the cutting pile force under the heterogeneous soil condition was put forward with the effect of row spacing considered. On this basis，analysis models and calculation method for the structural stability of pile wall frame structure were established，including stability against level-sliding，stability against rotation，overall circular sliding stability and vertical bearing capacity of pile foundation. The engineering tests were carried out to verify the application feasibility of the pile wall frame structure and its stability calculation method，and the influences on stability were studied，such as row spacing，pile length，pile diameter and pile spacing. Results show that the most unfavorable sliding surface goes across the pile body and lies on the bottom of subsoil layer with weak shear strength index，and increasing the row spacing can efficiently improve structural stability. The proposed calculation method can reasonably reflect the stability mechanism for wharfs of pile wall frame structure，and serve as reference for engineering application