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对不同开挖方式地下工程压力拱的发展演变过程进行了分析。分析结果表明,随着开挖的进行,地下工程拱顶部压力拱内边距变化不大而压力拱的厚度在增加;地下硐室两帮、底板中部压力拱内边距较大;核心土对硐室拱脚处压力拱的内边距有较大影响;分步开挖可使压力拱内边距减小而对压力拱厚度影响较小,即可使压力拱向硐室边沿移近。
The development and evolution of pressure arch under different excavation methods are analyzed. The results show that with the excavation progressed, the inner margin of pressure arch in underground arch did not change much but the thickness of pressure arch increased; the inner pressure of arch in the underground chamber was larger than that in the middle of bottom chamber; The inner margin of the pressure arch at the arch foot of the chamber has a greater impact. The step-by-step excavation can reduce the inner margin of the pressure arch and less affect the arch thickness, so that the arch of pressure can move closer to the edge of the chamber.