中文摘要：

最佳的支持时间的数字分析和在 Xiangjiaba 水力发出的电力车站的地下的植物的包围岩石的长期的稳定性索引基于 rheological 理论被执行。第一，每个岩石组的机械参数从试验性的数据被识别；第二，为在没有支持的走的挖掘的大洞的 rheological 计算和分析被做；最后，当在每挖掘步以后的 creep 率和排水量满足了最佳的支持时间的标准时，在典型的节在典型的点支持的最佳的时间被获得。当支持的最佳的时间被识别时，挖掘被重复，并且长期的稳定性爬时间和最大值爬典型的点的变丑根据长期的稳定性索引的标准被决定。特征的最佳的支持时间指在 Xiangjiaba 水力发出的电力车站的地下的植物，这被显示出是 58 d，典型的节的长期的稳定性时间是 126 d，并且相应最大爬变丑是 24.30 公里。当大洞被支持时，大洞变丑显著地被减少，压力包围岩石声明群众显著地被改进。

英文摘要：

Numerical analysis of the optimal supporting time and long-term stability index of the surrounding rocks in the underground plant of Xiangjiaba hydro-power station was carried out based on the rheological theory. Firstly, the mechanical parameters of each rock group were identified from the experimental data; secondly, the rheological calculation and analysis for the cavern in stepped excavation without supporting were made; finally, the optimal time for supporting at the characteristic point in a typical section was obtained while the creep rate and displacement after each excavation step has satisfied the criterion of the optimal supporting time. Excavation was repeated when the optimal time for supporting was identified, and the long-term stability creep time and the maximum creep deformation of the characteristic point were determined in accordance with the criterion of long-term stability index. It is shown that the optimal supporting time of the characteristic point in the underground plant of Xiangjiaba hydro-power station is 5-8 d, the long-term stability time of the typical section is 126 d, and the corresponding largest creep deformation is 24.30 mm. While the cavern is supported, the cavern deformation is significantly reduced and the stress states of the surrounding rock masses are remarkably improved.