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以基于岩体波速的Hoek-Brown准则为理论基础,根据岩体的稳定性条件建立了初始地应力场中水平地应力σH取值范围的计算模型,并通过已有的地应力测量数据验证了计算模型的合理性。在该计算模型的基础上,对平均水平地应力σ_(Hmean)、水平地应力和垂直地应力的比值σ_H/σ_V、侧压系数λ沿深度h的分布特征进行了研究,从岩体稳定性的角度较合理的解释了σ_H/σ_V在地层中的分布现象。在给定σ_(Hmean)和λ沿h分布的边界条件的基础上,建立了σ_(Hmean)和h之间、λ和h之间的非线性函数关系式,并将后者应用于工程实例中的初始地应力场计算。结果表明:在此初始地应力场条件下模拟出的岩体开挖后的应力和位移分布与现场地质调查情况基本相符,在地应力资料缺乏的情况下为初始地应力场评估提供了新的思路和方法。
Based on the Hoek-Brown criterion based on the rock mass velocity, the calculation model of the horizontal stress σH in the initial geostress field is established according to the stability of the rock mass. Based on the existing geostress measurement data, Calculate the rationality of the model. On the basis of the calculation model, the distribution characteristics of average horizontal stress σ_ (Hmean), horizontal stress and vertical stress σ_H / σ_V and lateral pressure coefficient λ along depth h are studied. From the aspects of rock mass stability The reason of the distribution of σ_H / σ_V in strata is explained reasonably. Based on the boundary conditions of σ_ (Hmean) and λ along h, a nonlinear function between σ_ (Hmean) and h and between λ and h is established, and the latter is applied to engineering cases In the initial stress field calculation. The results show that the stress and displacement distribution of rock mass excavated under this initial stress field is in good agreement with the field geological survey and provides a new evaluation of initial geostress field in the absence of the ground stress data Ideas and methods.