Abstract
Abstract The fissures are ubiquitous in deep rock masses, and they are prone to instability and failure under dynamic loads. In order to study the propagation attenuation of dynamic stress waves in rock mass with different number of fractures under confining pressure, nonlinear theoretical analysis, laboratory model test and numerical simulation are used respectively. The theoretical derivation is based on displacement discontinuity method and nonlinear fissure mechanics model named BB model. Using ABAQUS software to establish a numerical model to verify theoretical accuracy, and laboratory model tests were carried out too. The research shows that the stress attenuation coefficient decreases with the increase of the number of fissures. The numerical simulation results and experimental results are basically consistent with the theoretical values, which verifies the rationality of the propagation equation.
Highlights
Deep underground engineering construction is the important contents for research in the field of modern civil engineering
Aiming at the propagation and attenuation law of stress waves in fissured rock mass under high confining pressures, this paper carried out an laboratory model experiment, and adopted a deep-rock triaxial dynamic and static load test system to perform the simulation test, as shown in Figure 4, the size of the corresponding model test piece of the equipment was 200 mm × 200 mm × 200 mm, the model test piece was cast by the mold, the surface of the test piece was coated with Vaseline to decrease the end effects of the test piece
Based on nonlinear theoretical analysis, model tests and numerical simulation, this paper studied the relationship between the attenuation of stress wave propagation and the number of fissures under different confining pressures, and drew the following conclusions: (1) Based on the propagation attenuation mechanism of stress waves in fissured rock mass, this paper derived the propagation equations of stress waves passing through multiple fissures, compared the theoretical value with the experimental result and numerical simulation, and found that these three were in good agreement, which had verified the feasibility of theoretically calculating the stress wave attenuation coefficient
Summary
Deep underground engineering construction is the important contents for research in the field of modern civil engineering. The existing research results mainly focus on the propagation of stress waves in shallow fissured rock masses, and there are few studies on the propagation law of stress waves in different number of fissured rock mass under the influence of confining pressure. Laboratory model test and numerical simulation, this paper focusses on the influence of the number of fissures on the stress wave propagation in rock mass under different confining pressures, and compares the derived theoretical results of the attenuation equation with the experimental results and numerical simulation results for verification, which has provided a new idea for the study of the propagation and attenuation of stress wave in fissured rock mass under different confining pressures
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