均质黏土中圆形平板锚的抗拉承载力分析

基于网格重新生成和场变量映射的大变形有限元模型，探索了立即脱离和无脱离两种典型条件下均质黏土中圆形平板锚的抗拉承载力。与小变形有限元比较，大变形分析克服了锚周围土体初始网格畸变的不利影响，能够追踪平板锚整个拔出过程中抗拉力的变化。通过具体算例，考察平板锚表面摩擦性质和上覆土重等因素对立即脱离工况承载力的影响程度，指出有重土中深锚的承载力小于无重土中对应的承载力与上覆土重之和，其上限是无脱离条件下的承载力。计算结果表明：土重对无脱离条件下的承载力影响很小，进而给出了无脱离承载力系数与初始埋深的关系曲线。

Analysis of uplift capacity of circular plate anchors in uniform clay

Based on the mesh regeneration and mapping of field variables, a large deformation finite element model was developed. The uplift capacities of circular plate anchors in immediate break away case and no break away case were investigated using this model. It is assumed the anchors are buried horizontally in uniform clay. Compared with small strain finite element calculation, large deformation analysis overcomes the severe mesh distortion of soils around the plate anchor, which makes it possible to describe the variation of uplift capacity during the whole pulling-up process. According to several numerical examples under immediate break away condition, the effects of anchor roughness and overburden pressure on uplift capacity are studied. It is found as considering soil weight, uplift capacity of deep anchor is lower than the sum of corresponding capacity in weightless soil and the overburden pressure, and the upper limit is the capacity under no break away condition. It is shown that the soil weight puts slight effect on no-break away-capacity. The relationship between no-break away-capacity and initial embedment of anchor is offered.