Where condition (4) above is not fulfilled, the effectivedepth of the steel for the calculation of bending resistance in accordance with 6.1 should apply to the layer furthest from the tension face.
凡条件(4)项不符合，该钢计算弯矩的有效深度应符合6.1条，应适用于最远的一层张力。
2
In addition, there is usually a small amount of extra hole drilled to allow for junk, hole fill-in and other conditions that may reduce the effectivedepth of the well prior to running logging tools.
On this basis, the difference between the limited lift by vacuum pumping and the effectivedepth of vacuum preloading is analyzed and the reason of the latter may greater than the former is analyzed.