Joint board cable foundation is a kind of foundation form proposed by the author which is applied to transmission lines. In the study of pullout resistance of a joint board cable foundation, the most important factor is the critical depth of the anchor plate. Theoretical analyses, numerical simulations, and field tests were carried out to study the impact of the critical burial depth on the uplift capacity. Test results were corrected by the back-stepping cohesive force method. The theoretical analyses, numerical simulations, and field test results are consistent. It is found that the development of the plastic failure zone in the foundation is directly controlled by the shear strain. Through the field test, the pullout resistance of the anchor plate is studied, and it is found that the depth ratio has the most influence on the pullout capacity of the anchor plate. The field tests also provide valuable data for theoretical calculation, numerical simulation, and design of joint board cable foundations. The field test data analysis and numerical simulation results show that the optimal burial depth ratio of the joint board cable foundation is about 2.5–3.0. Therefore, in the design of the joint board cable foundation, 2.5 can be adopted as the critical depth ratio of the joint board cable.

中文翻译：

---

考虑临界埋深的联板索基础抗拔力研究

联板电缆基础是笔者提出的一种应用于输电线路的基础形式。在研究接缝板索基础抗拔力时，最重要的因素是锚板的临界深度。通过理论分析、数值模拟和现场试验研究临界埋深对抬升能力的影响。测试结果通过反步内聚力法修正。理论分析、数值模拟和现场试验结果是一致的。研究发现，地基塑性破坏区的发展直接受剪应变的控制。通过现场试验，研究了锚板的抗拔力，研究发现，深度比对锚板的抗拔能力影响最大。现场试验还为连接板电缆基础的理论计算、数值模拟和设计提供了有价值的数据。现场试验数据分析和数值模拟结果表明，接头板索基础的最佳埋深比约为2.5～3.0。因此，在接板索基础设计中，可采用2.5作为接板索的临界深度比。