surrounding rock expansion
surrounding rock expansion
围岩膨胀
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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When the rocks are fractured, roadway convergence is mainly due to expansion deformation of the surrounding rock within the fractured zone in a residual-strength state.
围岩处于破裂状态时，巷道收敛主要是由处于残余强度状态的破裂区围岩的碎胀变形引起的。
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