基于二次正交组合试验的围岩松动圈影响因素分析

Analysis of influence factors for the broken rock zone based on quadratic orthogonal method

围岩松动圈的形成实质是松动圈内围岩产生碎胀变形,碎胀变形是围岩卸荷扰动产生的松动与破坏,其影响因素包括地下水含量、地应力以及其它地质力学指标如霍克布朗参数等。采用二次正交组合试验的4因素5水平试验方案,并结合地质雷达,按照组合设计表进行了17次野外试验。经过计算得出影响因素的显著性由高至低分别为:霍克布朗参数S、M、S和M的交互作用及隧道埋深。

The essence of the broken rock zone is the formation of the hulking deformation of surrounding rock, while the hulking deformation of surrounding rock is produced by loosening or damaging after the unloading of tunnels, the influence factors include not only the groundwater and the ground stress, but also the other geological mechanic indicators, such as Hock-Brown parameters and so on. The quadratic orthogonal combination experiment with 4 factors 5 level scheme is used, and with the help of Ground Penetrating Radar, 17 times of the field tests are carried out in accordance with the combination design table. The tests results from high to low are listed as follows： the Hock-Brown parameter S, M, interaction of S and M and the buried depth of tunnels.