Numerical Simulation of Forepoling Bolt Installing Angle

Through the numerical simulation of 12081 tunneling crossheading of Yonghua 1^# mine, the study determined the reasonable bolt installing angle. 5 kinds of schemes with unsupported and forepoling bolt installing angle of 15°, 25°, 35°,45°were respectively simulated. Besides, the support pressure, stress difference and the displacements in vertical direction in ahead of the range 0 to 1.8 m were analyzed. The results showed that the most suitable installing angle range was 15°to 25°.