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The Study on Anchoring Effect of Fractured Rock Mass on Numerical Simulation

Author: NiuHaiYan
Tutor: ZhangDunFu
School: Shandong University
Course: Solid Mechanics
Keywords: Element-free Galerkin method Crack propagation CFRP Anchoring Effect Numerical Simulation
CLC: O346.1
Type: Master's thesis
Year: 2010
Downloads: 90
Quote: 1
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Abstract


The nature of the rock mass due to the geological movement, throughout a large number of discontinuities, including joints, level, faults and other forms of geological structure. The presence of the mechanical properties of the rock mass discontinuities has been greatly weakened, and planted a lot of hidden dangers to the construction. Bolt anchoring is the reinforced joints face one of the most effective and most economical support. In recent years the field of geotechnical reinforcement as the anchor technology has improved steadily, anchoring its unique shows vitality. However, the mechanical properties of the rock mass plus anchor has yet to fully grasp, construction generally rely on some construction experience, even if there are a lot of researchers have done a lot of research in model experiments, but due to the model experiments of their own shortcomings and some limitations of the method of calculation, the theoretical study of the anchor technology far behind the progress in the technical aspects. Meshless Galerkin method (of EFGM), moving least squares interpolation construct trial functions from the energy functional Galerkin weak variational form control equation by introducing a penalty function to meet the intrinsic boundary conditions, are both accurate , post-processing and simple, has a very distinct advantage in dealing with crack. After a systematic understanding of the element-free Galerkin method, the stress values ??calculated by uniformly distributed load of simply supported beam stress, displacement field and round the edge of the hole and beam theory and classical plate theory of analytic construed contrast, to obtain good accuracy. Through the comparison of the results obtained several important parameters in the element-free Galerkin method, and to verify the correctness of the ways programming. Select the appropriate crack propagation criterion: circumferential tensile stress criterion. Element-free Galerkin method to simulate the parameters of the initial expansion of the crack in the rock pressure, in good agreement with the results of the classical theory of elasticity. Seen, the element-free Galerkin method for solving the problem of crack propagation can meet the accuracy requirements of the project, with the popularization and application value. Solving oblique crack crack propagation under tensile stress state parameters on the basis of the correct authentication procedures and the selected criterion. From the point of view of the energy is deduced the equation of the control of EFGM consider carbon fiber (CFRP) correct the distortion, finishing amended. With the straight cracks intermediate CFRP reinforcement example to verify the feasibility of the formulas and procedures. And calculate the blessing of CFRP improvement in the mechanical properties of the rectangular plate containing a straight crack, while changes in the elastic modulus of the CFRP mechanical properties of the model. The element-free Galerkin method considering the presence of CFRP oblique crack propagation. First, the crack tip stress field in both ends anchor some studies, made a brief introduction on both ends of the anchor model failure modes, and made recommendations for future work. Several plus anchor program because of the reinforcement position, angle reinforcement the different anchoring effect.

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CLC: > Mathematical sciences and chemical > Mechanics > Solid Mechanics > Strength theory > Fracture theory
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