重塑断层泥的力学行为实验OA

Given that investigating the mechanical effects of fault gouge forms the basis for studying the engineering impacts within fracture zones,this study focuses on the fault gouge from the fracture zone of Yangbishan ferrotungsten mine(north zone).Through X-ray diffraction mineral composition analysis,the fault gouge was preliminarily classified into two categories.Different fine particle content ratios and moisture conditions were applied to conduct direct shear experiments on samples,followed by multivariate analysis of variance and correlation analysis on the experimental results.Findings revealed that water content significantly affects the cohesion(c)and internal friction angle(φ)of the fault gouge.The combination of water content and fine particle content notably impacts c and φ.Changes in fine particle content and water content levels have a greater effect on φ than on c.The sequence of influence on cohesive strength from the greatest to the least is:moisture content,lithology,and fine particle content.For the impact on the friction angle,the order from the greatest to the least ranges as follows:when the moisture content is between 5%to 10%,it is moisture content,lithology,and fine particle content;with the moisture content between 10%to 15%,it is fine particle content,lithology,the moisture content.Leveraging multiple nonlinear regression theory,a multiple nonlinear regression model concerning multiple factors and fault gouge c,φ was established.Validation showed high determination coefficients for c and φ in this model,indicating its reliability through significant regression and an evident linear relationship between predicted and actual values.