Advances in Civil Engineering / 2019 / Article / Tab 2

Research Article

Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar

Table 2

Three stages of stress change during advance.

Unstressed influence sectionAdvance stress influence sectionSuperimposed stress influence section

Roof stress in maximum failure plane (MPa)101118
Peak stress of roadway roof (MPa)101318
Peak position (m)−17.50−17.5

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