压裂岩体微裂缝损伤演化的混沌特性研究

摘要

采用现代非线性科学的分岔和混沌理论对岩体水力压裂过程微裂缝演化特性进行了研究.定义了反应岩体细观结构与微裂缝混沌演化的张量型损伤变量.构造了适用于含天然裂缝岩体微裂缝局部化分岔混沌演化的Logistic标准模型.计算了微裂缝混沌演化分岔角度、分岔数目与不同裂缝形态的分岔开度.选取某油田的实际研究区块,理论计算与有限元软件模拟结果表明:理论计算准确,可靠性强.%Characteristics of micro-crack evolution under hydraulic fracturing on rock mass were studied on using chaotic theory and bifurcation of modem nonlinear science, the tensor damage variable which described the chaotic evolution of micro-cracks and microstructure of rock were defined; the Logistic model of localization bifurcation of intrinsic rock was bui bifurcation point of chaotic evolution of micro-crack, bifurcation the number of crack patterns and different degree of sub-branch off were calculated.Practical research block was select, results of theoretical calculation and finite element software simulation showed: theoretical calculation is accuracy and credible.