Abstract
In this study, through an analysis of vibration response characteristics of joint surface stiffness on dangerous rock mass, the relationship formula between amplitude ratio of the dangerous rock mass to the bedrock and the length of the bonding section of the joint surface is determined. The stability of the rock mass can be evaluated by combining the formula with the existing rock-mass limit equilibrium theory. This study proposes the existence of a resonance bonding length for the dangerous rock mass. When the length of the bonding section reaches the resonance bonding length, the dangerous rock mass has the largest response to the bedrock vibration. The study found that when the length of the bonding section of the dangerous rock mass is longer than the resonance bonding length, the amplitude ratio increases with the decrease of the bonding section and increases with the increase of the vibration frequency of the bedrock. When the length of the bonding section of the dangerous rock body is shorter than the resonance bonding length, the amplitude ratio decreases with the decrease of the bonding section and decreases with the increase of the vibration frequency of the bedrock. Indoor experiments were conducted by collecting the vibration time-history curves of rock blocks and stone piers and performing analysis and calculation, which proved the accuracy of the analytical results. Through the amplitude ratio of the dangerous rock mass and the bedrock, the bonding length can be calculated. This method can improve the calculation accuracy of the stability coefficient K of the dangerous rock mass.
Highlights
Through an analysis of vibration response characteristics of joint surface stiffness on dangerous rock mass, the relationship formula between amplitude ratio of the dangerous rock mass to the bedrock and the length of the bonding section of the joint surface is determined. e stability of the rock mass can be evaluated by combining the formula with the existing rockmass limit equilibrium theory. is study proposes the existence of a resonance bonding length for the dangerous rock mass
Indoor experiments were conducted by collecting the vibration time-history curves of rock blocks and stone piers and performing analysis and calculation, which proved the accuracy of the analytical results. rough the amplitude ratio of the dangerous rock mass and the bedrock, the bonding length can be calculated. is method can improve the calculation accuracy of the stability coefficient K of the dangerous rock mass
Formula (1) has shown that the length of the bonding section determines the stability of the slip-type dangerous rock mass. erefore, we can determine the stability of the dangerous rock mass by analyzing the ratio of the amplitude of the dangerous rock mass to the bedrock
Summary
In the process of rock mass from stable to unstable failure, the length of the bonding section of the joint surface continuously decreases, and the antislip force it can provide continuously decreases. E preceding analysis shows the influence process of the bonding section of the joint surface on the stability of dangerous rock mass. M2 natural vibration frequency: f2 k/m2 Relative vibration frequen c y : λ w/f2 Damping ratio: ξ c/2 km2 It can be seen from equations (2) and (3) that the bonding section will affect the stiffness and damping of the dangerous rock mass when it vibrates, causing the dangerous rock mass and the parent rock to produce different amplitudes. Formula (1) has shown that the length of the bonding section determines the stability of the slip-type dangerous rock mass. Formula (1) has shown that the length of the bonding section determines the stability of the slip-type dangerous rock mass. erefore, we can determine the stability of the dangerous rock mass by analyzing the ratio of the amplitude of the dangerous rock mass to the bedrock
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
