ショートステップ工法を使用すると、支柱の閉鎖時間を短縮し、初期支柱の応

Using the short step method helps to reduce the closing time of the stanchions, improves the stress conditions of the initial stanchions and helps control the deformation of surrounding rocks. Note the following when using the short-step method: ① The initial closure of all sections must be completed within 30m of the excavation surface or within 30 days of the start of the upper half of the excavation. (2) If the initial support is greatly deformed or sinks, it must be closed in advance. (3) Consider the minimum number of steps, assuming that the construction machine operates normally.

The short-step method helps to reduce the closing time of the strut, improve the stress condition of the initial strut, and control the deformation of the surrounding rocks. When using the short step method, keep the following in mind: (1) The closure of the first all section must be completed within 30 m from the drilling surface or within 30 days from the start of the first half of the excavation. (2) If the initial support is greatly deformed or sunk, it must be closed beforehand. (3) Consider the minimum number of steps on the assumption that construction machinery will operate normally.

使用短步工法可以缩短支柱的关闭时间，改善初期支柱的应力状态，有助于控制周围岩石的变形。使用短步法时，请注意以下几点。①第一个全断面的关闭必须在距离挖掘面30米以内，或者从挖掘的上半部分开始30天内完成。②初始支持出现较大变形或下沉时，需要事先关闭。③以建设机械正常运转为前提，研究最低步数。<br>