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南水北调中线总干渠交叉建筑物桩基与渠坡间的非协调变形问题是渠道大面积施工前必须解决的技术难题,为了设计有效、合理的结合部防渗结构,建立ABAQUS数值计算模型,对桩体与渠坡土体的非协调变形特性进行了数值模拟研究,并对某一工程实例的非协调变形作了分析计算。研究结果表明:所建立的计算模型可以较好地模拟桩体和渠坡土体的非协调变形的发展过程;随着水平荷载的增大,裂隙深度逐渐加深,极限状态时裂隙开展深度可达到地表以下1/2桩长处。在竖向荷载作用下,当荷载较小时,桩土间未产生滑移变形,随着荷载的进一步增大桩体的沉降量逐渐增大由线性段向非线性段转化,而桩侧相邻土体的沉降量基本上呈线性增加。在水平荷载作用下,与竖向荷载作用情况不同的是荷载较小时桩土间也会产生分离变形,随着荷载进一步增大,桩体的水平位移非线性逐渐增大,而桩侧相邻土体的水平位移(回弹位移)基本上呈线性增加。根据实例分析,实际荷载作用下所产生的非协调变形相对较小,初步设计所采用的沥青填缝措施基本上能够适应非协调变形,防止渠水、雨水入渗。
In order to design an effective and reasonable joint anti-seepage structure, the ABAQUS numerical calculation model is set up and the pile foundation of the pile in the mid-route of the Middle Route of South-to-North Water Diversion Project is reconstructed. The non-coordinating deformation characteristics of soils and drainage slopes are studied numerically, and the non-coordinated deformation of a project is analyzed and calculated. The results show that the established calculation model can well simulate the development of the non-coordinated deformation of the pile body and the slope slope soil body. As the horizontal load increases, the depth of the fracture wall gradually deepens, and the depth of the fracture development reaches the limit state Below the surface 1/2 pile strengths. Under the action of vertical load, when the load is small, there is no slip deformation between pile and soil. With the further increase of load, the settlement of pile increases gradually from the linear section to the nonlinear section, The settlement of soil mass basically increases linearly. Under the action of horizontal load, the difference between the vertical load and the vertical load is that when the load is small, the pile-soil also can separate and deform. As the load increases further, the horizontal displacement of pile increases nonlinearly, Soil horizontal displacement (rebound displacement) increases linearly. According to the case analysis, the uncoordinated deformation produced by the actual load is relatively small. The asphalt caulking used in the preliminary design can basically adapt to the non-coordinated deformation and prevent the infiltration of drains and rainwater.