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分析松动圈的分布范围对优化隧道支护参数，确保隧道施工安全有重要的理论价值，以弹塑性理论计算为基础，利用 Ｈ－Ｂ强度准则推导了理想状态下围岩松动圈厚度的计算公式。当侧压力系数不等于１时，将实测竖直方向和水平方向的初始地应力分别带入，并考虑实际支护力的影响，得到较为准确的围岩松动圈分布规律。在铜旬高速某公路隧道中该方法计算所得围岩松动圈分布范围与围岩深部位移监测所得结果较为接近，验证了基于 Ｈ－Ｂ强度准则的围岩松动圈计算公式的准确性，为确定围岩松动圈半径提供了新的有效方法。
Analyzing the distribution range of loose ring has important theoretical value for optimizing the parameters of tunnel support and ensuring the construction safety of tunnel. Based on the elastoplastic theory, the calculation formula of the loose ring thickness of surrounding rock under ideal conditions is deduced based on the H-B strength criterion . When the lateral pressure coefficient is not equal to 1, the measured initial in-situ stress in the vertical direction and in the horizontal direction are respectively taken into account, and the influence of the actual supporting force is taken into account to obtain a more accurate distribution rule of loose ring of surrounding rock. The calculated range of the loose ring of the surrounding rock calculated by this method is close to the result of the monitoring of the deep displacement of the surrounding rock in a copper tunnel with a high speed. The accuracy of the calculation formula of the rock loosening circle based on the H-B strength criterion is verified. Rock loosening radius of the surrounding rock provides a new and effective method.