Analysis of Uniaxial Compressive Strength and Elasticity Modulus of Tunnel Face Surrounding Rock Based on Drilling Parameters
With burial depth,the section size and length of tunnels gradually increase,and the physical and mechanical parameters of the tunnel face surrounding the rock directly affect the tunnel face stability.The traditional rock laboratory test method consumes considerable manpower and material resources,making it challenging to guide the intelligent design and construction of tunnels.Based on drilling parameters,this study proposes an intelligent analysis method for the uniaxial compressive strength and elastic modulus(Rb-E)of rocks surrounding a tunnel face.First,a formula for calculating the mechanical specific energy during the combined impact-thrust-rotation rock-breaking process of a computer three-arm drilling jumbo is proposed from an energy perspective.Subsequently,a numerical simulation was conducted to simulate the rock-breaking process of the computer three-arm drilling jumbo.Using dynamic analysis methods,the drilling speed and dynamic response patterns of the energy inside the dense rock unit and the uniaxial compressive strength and elastic modulus of the surrounding rock per unit volume were analyzed under different uniaxial compressive strength and elastic modulus conditions of the surrounding rock.Subsequently,an analytical model of the uniaxial compressive strength and elastic modulus of the surrounding rock at the tunnel face based on drilling parameters(DP-Rb-E)was established using the energy method.Field drilling experiments and tests of the mechanical parameters of the surrounding rock were performed to verify the reliability of the method,relying on drilling and blasting method tunnel projects such as the Zhengwan high-speed railway and the Yixing liaison line.The results indicate that under the same conditions of thrust pressure,impact pressure,and rotational speed,the greater the uniaxial compressive strength and elastic modulus of the surrounding rock,the slower the drilling speed,and the higher the average internal energy of the dense units of the surrounding rock.The results of field experiments showed that the variation rate between the analytical results and the measured results of uniaxial compressive strength ranged from-5.52％to-20.89％,while the variation rate between the analytical results and the measured results of the elastic modulus ranged from-9.01％to-22.03％.
tunnel engineeringtunnel face surrounding rockDP-Rc-Eenergy methoddrilling parametersimpact-propulsion-rotation rock breaking
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