Result showed that the construction would be the worst stress condition and unloading effect occurred when the middle pit was excavated with both-side leading pit method being applied.

中洞上步开挖是施工过程中最不利环节，容易产生较大的卸荷效应，引起拱顶和地表的大幅度沉降。

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Before the advent of computers and charting software, pit traders and market makers used this method to figure out where the markets might be heading.

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