隧道塌方是工程中常见的地质灾害，对其发生的可能性及其风险分级评价一直是工程界的难题之一。针对理想点法的基本原理，建立基于理想点法的隧道塌方风险等级评价模型。在综合考虑影响隧道塌方风险因素的基础上，选取岩石单轴饱和抗压强度等12个具有代表性的影响因素作为隧道塌方风险评价指标体系，根据既定体系确定相应的评价标准，建立一种新的隧道塌方风险评价模型。利用2个典型隧道样本对本文模型进行验证，评价结果与隧道塌方风险等级基本一致，与云模型理论得到的隧道塌方风险评价结果也相近，且该方法简单、直观、可操作性强。

Collapse is one of the main geological disasters during tunnel construction. The prediction of tunnel collapse and classification of tunnel collapse risks are very difficult. A tunnel collapse risk grade evaluation model is established based on ideal point method. Twelve typical indexes are selected for tunnel collapse risk grade evaluation and a series of evaluation standards are decided. The modeling results are testified by 2 typical tunnel samples and they coincide with the actual results and the evaluation results of cloud model. The abovementioned tunnel collapse risk grade evaluation method is simple, intuitive and practical.