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Meshless method numerical simulation of hydraulic fracturing rock single fracture

Author: SuLiXun
Tutor: DongYuZuo
School: Kunming University of Science and Technology
Course: Hydraulic Structure Engineering
Keywords: Rock hydraulic fracturing Meshless method Crack Hillerborg viscous zone crack model Single crack
CLC: TU45
Type: Master's thesis
Year: 2008
Downloads: 91
Quote: 0
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Abstract


With the development of society, many of today's large-scale construction of the project is to the underground development , underground works without water pressure , and this contributed to the theoretical study of hydraulic fracturing rock . The problem is hydraulic fracturing rock seepage -stress coupling of a branch , for its research is still in its initial stage, many basic theoretical issues to be further study. This view of this , the use of simulated crack meshless method superiority , to carry out hydraulic fracturing of rock meshless method simulation study . First , this paper the basic principles of non-grid method , moving least squares method has been studied on this basis , meshless method derived the basic equation . Examples show that the meshless method before and after treatment with a simple calculation and high accuracy . Secondly , combined with fracture mechanics and mechanical properties of rock itself , analyzes rock crack tip stress field and crack crack propagation criterion , further analysis of hydraulic fracturing mechanism of cracking . Then , assuming that the process of hydraulic fracturing rock fracture morphology is elliptical , from the fluid mass and momentum conservation law departure , using the control volume method derived fluid motion crack the concrete form of conservation of mass , sewing differential water pressure distribution and obtained in steady state crack propagation within a certain time slot pressure calculation formula . Both from a qualitative and quantitative comparison of the results with the experimental description of the proposed theoretical formula reflects the regularity is correct. Finally, in the understanding of the mechanism of hydraulic fracturing on the basis of cracking for Ⅰ crack crack model using Hillerborg sticky area and crack propagation steady state pressure within a certain time slot calculation , preparation of simulated rock meshless method of hydraulic fracturing process. Numerical example shows that this procedure can be well prepared simulated crack hydraulic fracturing .

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