基于监测量值变化速度特征的围岩稳定动态综合评判模型

Dynamic Comprehensive Evaluation Model for Surrounding-Rock Stability Based on Variation Speed Characteristics of Measurements

隧道施工中围岩力学行为受较多因素影响,考虑多因素对围岩稳定的综合评判被越来越多研究者所共识。监控量测是隧道围岩应力、变形状态最直接的反映,其变化速度特征是围岩稳定性评价的重要指标;从围岩稳定性的综合评判模型构建角度来说,所建立的模型必须考虑时间因素进行动态综合评判。据此,文章利用具有速度特征的动态综合评价模型可将评价对象速度状态和趋势融合的特点,提出了基于监测量值变化速度特征的隧道围岩稳定动态综合评判模型的构建方法和评判准则。该模型从多因素角度出发,可以全面地对多时段内被评价对象的变化速度进行测度;所采用的被评价对象变化速度状态和速度趋势计算方法使模型在短时量测或量测数据拟合程度不高时同样适用。该模型的可行性在华蓥山隧道围岩稳定判别中得到了验证,为隧道围岩稳定的综合判定提供了一种新的途径。

Considering that the mechanical behaviors of surrounding rock are affected by various factors, the comprehensive evaluation model of surrounding-rock stability is being accepted by more and more researchers. Monitoring and measuring are the most direct ways of reflecting the stress and deformation state of surrounding rock, since the characteristic of variation speed is the important indicator of surrounding-rock stability. As for the establishment of a comprehensive evaluation model for surrounding-rock stability, the time factor must be taken into account to provide a dynamic evaluation. In light of the advantage of incorporating both variation speed and its trend, a modeling method and the relevant evaluation criteria for the dynamic comprehensive evaluation model for surrounding-rock stability are put forward. From the perspective of multiple factors, this model can measure the variation speed of evaluated targets in multiple time periods comprehensively. The model is also appropriate for short-time monitoring, or a case when the correspondence between simulated and measured results is not good enough. The feasibility of the model is verified by the Huayinshan tunnel, providing a new approach for evaluat- ing the surrounding-rock stability.