基于应变耦合渗流模型的裂隙岩体弹性模量研究

Study on Elastic Modulus for Fractured Rockmass Based on Strain Coupled Hydraulic Model

原地直接测定裂隙岩体的弹性模量Em,由于各种原因,在工程实践中往往有一定的困难。作为一种替代方法,通常人们利用实验室测得的岩石弹性模量E来确定裂隙岩体弹性模量Em。提出的耦合应变渗流模型,建立了裂隙岩体中裂隙与岩块在应力作用下的变形协调和应力平衡关系,通过考虑裂隙岩体中地下开挖体涌水量大小可直接反映裂隙的贯通情况和密度大小这一事实,用地下开挖体涌水量大小和岩体弹性模量折减系数Rm来计算岩体弹性模量。为计算岩体弹性模量提出了一个可能的新途经。该模型的结果与实际数据吻合良好。

Due to various causes, it is often difficult in engineering practice to make a direct in-situ measurement of the elastic modulus EM of fractured rockmass. As an alternative method, the rock elastic modulus E measured in the lab is generally used to determine the elastic modulus EM of fractured rockmass. The strain coupled hydraulic model that is proposed in the paper has established the deformation coordination and stress balance relations between the fracture and the rock blocks in fractured rockmass. Considering the fact that water inflow in underground excavation in fractured rockmass can directly reflect the fracture connectivity and density, rockmass elastic modulus is calculated based on the said water inflow and the reduction factor of rockmass elastic modulus Rm, hereby providing a new possible way to determine the elastic modulus of fractured rock. The results of the model agree very well with the real data.