中文摘要：

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。

英文摘要：

The evolution of pressure arch of underground engineering excavated in different ways was analyzed. The results of analysis showed that with progress of excavation the space between two the inner borders of pressure arch on the top of underground engineering changed little, but the thickness of the pressure arch was increasing; tbe space between two the inner borders of pressure arch was larger in the middle of the floor and the two sides of underground cavern engineering than other part ;core -soil had a greater effect on the space between two the inner borders of pressure arch on the base of underground cavern engineering;step- by- step excavation could make the space between two the inner borders of pressure arch reduce, but had a little impact on the thickness of pressure arch, that is, could make the pressure arch closer to the edge of underground cavern engineering.