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Mechanism and Numerical Simulation of Rock’s Crack Propagation Under Detonation Gas

Author: LiZhiHong
Tutor: DangFaNing
School: Xi'an University of Technology
Course: Geotechnical Engineering
Keywords: Detonation gas Crack propagation Non - uniformity of Ground stress Numerical Simulation
CLC: TU458
Type: Master's thesis
Year: 2006
Downloads: 466
Quote: 1
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The rock blasting damage and fracture process is a complex process . Due to the non- uniformity and anisotropy of the rock material , in theory, it is difficult accurate description of the characteristics of its composition ; micro- defects under external loads , as well as the complexity of the interactions between the macroscopic crack , existing analytical method still lacks effective means of this study ; and because of the limitations of laboratory equipment , testing methods , not on blasting rupture process microscopic changes in the hierarchy of audience measurement , in particular, can not be precise observation of the non - uniform stress and strain fields . Thus, rock blasting damage and fracture mechanism , and the use of a numerical model simulation of the complex nature of the rock , thus simulating blasting the whole process of crack development , is one of the main topics of the blasting theoretical and technical development as well informed as possible . Rock fracture mechanics and damage theory based study the damage fracture mechanism of rock under explosive stress wave action and detonation gas quasi-static effect . Quasi-static effect of crack propagation in-depth analysis of the detonation gas that blasting engineering , crack propagation , rock crushing detonation gas due to the role of the detonation gas is the main reason of crack propagation in rock . On this basis , a numerical simulation of the the detonation gas under quasi-static rock crack propagation process . Based on the understanding of rock mesostructure , considering the non - uniformity of the rock , the rock material properties described by some statistical regularity - in accordance with a given Weibull distribution and normal distribution to assignment . Establish a meso -level analysis of rock failure process non-uniform model , heterogeneity of rock and initial stress on crack propagation analysis . After calculation shows that the homogeneous coefficient is the characterization of the nature of the rock material microstructure difference parameter determining the internal factors of the macro - mechanical properties of rocks ; In situ stress known case , the initial crack and the angle between the direction of the maximum horizontal stress more the smaller, the greater the length of crack propagation , the smaller the angle the greater the length of the crack propagation , crack propagation total length anywhere stress decreases . Thus, the Highlands stress conditions , and other geological conditions the same rock harder to blasting, and explosives consumption to a corresponding increase .

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Rock ( rock ) mechanics and rock testing > Indoor rock test
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