The effective stress iterative method of estimating neutral point and downdrag on a single pile was presented in this paper.

采有效应力迭代算法来确定中性点的位置和计算下拉荷载值,并通过例来说明迭代试算的过程。

The diagnosis principle and diagnosability conditions are proposed, and the normal tolerance network test nede voltage interval are given by interval iterative algorithm.

该方法给出了差情况下诊断的原理和可诊断性条件，并间迭代算法，给出了差网络无故障情况下的测试节点电压范围。