Influence of fracture roughness and micro-scale rock properties on the hydro-mechanical behaviour of fractured rock masses

岩石在颗粒尺度（微尺度）上的力学和几何特性决定了裂隙岩体在各个尺度上的水力学行为。本研究的总体目标是通过具体考虑断裂粗糙度和岩石微观结构，开发一种新的方法来模拟断裂岩体的水力力学行为。通过对表面粗糙度和岩石微观结构进行高分辨率测量，我和我的学生将能够提供必要的约束，以测试用于描述断裂岩体行为的数值和分析模型，其中复杂的表面粗糙度几何形状，非均质颗粒分布，空洞和缺陷的存在仍然很难模拟。拟议的研究将涉及四个独立但互补的领域，这些领域是在实验室和岩体（矿山）尺度上，对断裂粗糙度和岩石微观结构（粒度和分布、矿物学、微裂缝的存在和方向）在断裂岩石的水力力学行为中所起的作用进行量化的整体计划的一部分。我们将研究三维微观结构对实验室尺度下岩石强度（D1）、矿山尺度下岩石强度（D2）、节理粗糙度和节理抗剪强度（D3）的影响，以及裂隙粗糙度在生物化学过程演化和岩体渗透率中的作用（D4）。提出的研究的重要部分是“将实验室带入矿山”，直接获取用于数值模型的比例岩体参数。它将通过使用高分辨率3D光学扫描仪来实现，该扫描仪易于携带，并在实验室和现场条件下提供相同的测量分辨率。这种新方法将使我的小组能够获得关于岩石结构和断裂粗糙度的相同信息，这些信息今天只能在实验室条件下直接在现场（矿井漂移）获得。该研究计划为实验和数值岩石力学方面的高素质人才培训提供了独特的机会，并将加强加拿大矿产工业。

Mechanical and geometrical properties of rock at grain scale (micro-scale) govern the hydro-mechanical behavior of fractured rock masses at all scales. The overall objective of this research is to develop a novel approach for modeling the hydro-mechanical behavior of fractured rock masses by specifically accounting for fracture roughness and rock microstructure.     By making high-resolution measurements of surface roughness and rock microstructure, my students and I will be able to provide the necessary constraints to test numerical and analytical models for describing fractured rock masses behavior, where complex surface roughness geometry, heterogeneous grain distribution, presence of voids and flaws remain very difficult to simulate.     The proposed research will address four independent but complementary areas that are part of the overall program of quantifying the role of fracture roughness and rock microstructure (grain size and distribution, mineralogy, presence and orientation of micro-cracks) within the hydro-mechanical behavior of fractured rock at laboratory and rock mass (mine) scale. We will study the influence of 3D microstructure on rock strength at laboratory scale (D1), at mine scale (D2), on joint roughness and joint shear strength (D3), and the role of fracture roughness in the evolution of bio-chemical processes and rock mass permeability (D4).     Important part of the proposed research aims at "bringing the laboratory inside a mine" to directly acquire scaled rock mass parameters to be used in numerical models. It will be achieved by using a high resolution 3D optical scanner that is easy to carry and provides same measurement resolution at both laboratory and field conditions. This new approach will enable my group to acquire the same information regarding rock structure and fracture roughness that today are possible only at laboratory conditions, directly on the site (mine drifts).     The research program offers a unique opportunity for highly qualified personnel training in experimental and numerical rock mechanics, and it will strengthen the Canadian mineral industry.