Abstract
Stress wave which is caused either by an explosion in a borehole or by an accidental explosion in a tunnel is supposed to be considered under certain circumstances when it propagates through the surrounding rock masses which contain holes in cylindrical form. Studying the ground motion induced by the cylindrical wave propagation is of practical significance for underground rock engineering and underground energy exploitation. The current study presents a numerical study on the ground motion caused by cylindrical P-wave propagation across a rock mass with a structural plane using a discrete element numerical method, UDEC. Firstly, the accuracy and validity of the cylindrical wave propagation simulation in UDEC and of the induced ground vibration are confirmed by comparison with the theoretical results for a special case that there is no structural plane in a rock mass. Secondly, cylindrical wave propagation across a rock mass with a structural plane is simulated, and then, the particle velocity on the ground surface is subsequently obtained. Finally, parametric researches are carried out on the influence of the monitoring point’s position, the structural plane stiffness, and the frequency of incident wave on the peak particle velocities (PPVs) of the ground vibrations.
Highlights
Dynamic loads caused by engineering blasting usually spread in rock mass in the form of stress waves
When stress waves arrive at the ground, vibrations will be caused, which may threaten the safety and stability of buildings and structures on the ground. erefore, it is of practical significance to pay attention to the ground motion caused by stress waves in the construction and design of underground engineering
Relatively few researches focus on the influence of the structural plane on the ground vibration caused by the cylindrical wave
Summary
Dynamic loads caused by engineering blasting usually spread in rock mass in the form of stress waves. Few researches are based on the abovementioned methods to study the influence of rock discontinuity on wave propagation and on the induced ground motion associated with In addition to those above numerical methods, the discrete element method (DEM) is more widely used and more efficient to analyze wave propagation in jointed rock masses, in comparison with the theoretical solution [25]. Yoo et al [32] adopted a pseudostatic discrete element to analyze the circular tunnel dynamic response and to evaluate the effect of deformation under seismic wave Among those above, relatively few researches focus on the influence of the structural plane on the ground vibration caused by the cylindrical wave. E current study numerically simulates the ground motion induced by cylindrical wave propagation across a rock mass with a structural plane by UDEC. According to the propagation characteristics and emergence angles of the incident and reflection waves, the horizontal and vertical components of the body wave caused vibration velocity of the ground surface particle, i.e., Vnb and Vτb, can be, respectively, derived by combining equations (1) and (2) and are expressed in the matrix form as Ground surface l
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