Е.φ.萨瓦连斯基统计,对于大多数的岩石,泊松比接近0.25。当泊松比ν>0.5时,岩石便进入塑性状态。当振动在无限弹性介质中发生时,压缩波不是分层地而是连续不断地向外扩散,周围介质成为一个连续整体,克雷洛夫认为介质成整体地振动时,拉梅系数λ=μ(泊松假设)。在距离爆破中心为r的点上,当t≥r-r_0/a时,φ值为: Е.φ. Savarinsky's statistics, for most rocks, the Poisson's ratio is close to 0.25. When the Poisson's ratio ν> 0.5, the rock will enter the plastic state. When the vibration occurs in an infinite elastic medium, the compressional wave diffuses not continuously but hierarchically but continuously, and the surrounding medium becomes a continuous whole. When the medium vibrates integrally, the Lame's coefficient λ = μ (Poisson assumption). At the point r from the blasting center, when t≥r-r_0 / a, the value of φ is: