当地下工程（包括隧道工程）中开挖断面较大的时候，称为大断面，在施工工程中，大断面开挖受力较为不利。
Recently pin timbering has been extensive used because the bolting of coal road has mellowed, however the problem of difficult tunnel reinforcement haven’t been solved properly, for example, wide span tunnel, heavy section.
近年来,随着煤巷锚杆支护技术日趋成熟,锚杆支护得到普遍推广应用,但是还不能很好解决大跨度、大断面等巷道支护加固问题。
参考来源 - 大跨度切眼巷道锚杆（索）支护技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
形成良好的泥浆套是大断面箱涵顺利顶进施工的关键。
It is a key factor for large cross section box culvert to form good slurry sleeves.
合理的扁平率对大断面隧道稳定性和经济性具有重要的意义。
Reasonable span-ratio has an important effect on configuration stability and economical nature of large-span tunnel.
通过对大断面大跨度巷道围岩稳定性的分析，提出了支护的总体思路。
The large span large section of the roadway surrounding rock stability analysis supporting the proposed overall idea.
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