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The time and space of the support structure applying is related to the overall stability of the roadway after excavation directly. Designed twenty-four groups of roadway support schemes with time and space dimensions, and studied the stability characteristics of roadway in different schemes by using Fast Lagrangian Analysis of Continua in Three Dimensions. The main conclusions are as follows: the influence of energy dissipation (time) and support position (space) on the stability of the roadway is not a linear relationship, and supporting at the appropriate opportunity can be beneficial. Established the "displacement-dissipation energy" curve, founding that there is an obvious "jump" phenomenon in the dissipation energy of surrounding rock during the process of gradually increasing displacement. A novel method for determining the optimum supporting opportunity of roadway based on energy dissipation was proposed, based on the above finding. This study can provide an original idea for the determination of roadway supporting opportunity.

支护施作的时空条件与巷道开挖后的整体稳定性直接相关。本研究设计了24组涵盖时空维度的巷道支护方案，并采用三维连续介质快速拉格朗日分析（Fast Lagrangian Analysis of Continua in Three Dimensions）对不同方案下巷道的稳定性特征进行了研究。主要研究结论如下：能量耗散（对应时间维度）与支护位置（对应空间维度）对巷道稳定性的影响并非线性关系，选择恰当的支护时机可获得良好的支护效果。本研究构建了“位移-耗散能”曲线，发现围岩耗散能在位移逐步增大的过程中存在显著的“跃变”现象。基于上述发现，提出了一种基于能量耗散的巷道最优支护时机确定新方法。本研究可为巷道支护时机的确定提供原创性思路。