上软下硬复合地层隧道施工爆破岩体参数敏感性的灰色关联分析

Gray Relational Analysis on Parameter Sensitivity of Blasting Rock Mass in Soft-hard Composite Strata

在上软下硬复合地层进行隧道爆破开挖的过程中,爆破地震动效应会引起软硬岩体间相互挤压、错动,加剧围岩失稳。采用爆破荷载模型进行参数分析,以确定不同岩体参数对隧道爆破施工的影响;同时,基于灰色关联的敏感性分析方法,研究不同岩体参数的相对重要性。结果表明,上软下硬复合地层隧道爆破施工地震动效应影响因素的主次顺序为：密度比〉弹性模量比〉泊松比〉内摩擦角比,并根据研究结果讨论了对隧道爆破施工的实际意义。

In the process of tunnel blasting excavation in soft and hard composite strata,the effect of blasting ground motion can cause the hard and soft rock mass to be squeezed and dislocated,and aggravate the instability of surrounding rock.In this paper,the blasting load model is used to analyze the parameters.At the same time,based on the gray relational sensitivity analysis method,the relative importance of different rock mass parameters is studied.The results show that：the order of the influence factors of the ground motion effect of the soft and hard composite strata tunnel blasting is：density ratioelastic modulus ratio 〉Poisson＇s ratio〉internal friction angle ratio,and the practical significance of tunnel blasting construction is discussed according to the research results.