摘要
心墙坝的水力劈裂问题是非连续介质中的非连续变形问题,还牵涉到渗流与土骨架的流固耦合等.基于连续介质理论的有限元法在对水力劈裂问题的模拟分析上有一定的局限性.对于心墙土这种离散材料,采用颗粒流模拟其水力劈裂问题是一种值得深入研究的方法.运用PFC(颗粒流)程序模拟研究水力劈裂的典型物理试验,模拟结果显示,采用颗粒流研究水力劈裂问题是可行的.对均质试样、非均质试样、均质(含软弱带)试样分别进行模拟分析,对比结果表明:均质试样不会发生水力劈裂现象,非均质(含有软弱带)试样发生水力劈裂的可能性最大.对非均质(含软弱带)试样发生水力劈裂的全过程的模拟分析结果初步认为,水力劈裂破坏的力学机理是张拉破坏.
Hydraulic fracturing itself involves those problems：discontinuous deformation in discontinuous media owning to the cracking in core and fluid-solid coupling problem and so on.The FEM which is based on continuous theory has its deficiencies on simulating hydraulic fracturing problem.For the discrete soil core material,the particle flow code（PFC） which is adopted to simulate it is worthy to research deeply.Using PFC to simulate the typical hydraulic fracturing physical experiments,the results show that,using the particle flow code to simulate the hydraulic fracturing problem is feasible.After analyzing homogeneous sample,non-homogeneous samples and homogeneous sample with weak-link,the result is that hydraulic fracturing does not occur in homogeneous sample under normal circumstances;but it is most likely to occur in homogeneous sample with weak-link.The heterogeneous specimen with weak-link is simulated to analyze the mechanism of hydraulic fracturing.The results of the simulation show that the mechanism of hydraulic fracturing is tension crack failure.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2011年第1期1-6,共6页
Engineering Journal of Wuhan University
基金
国家自然科学杰出青年基金(编号:50779047
50979082)
关键词
水力劈裂
流固耦合
离散元
颗粒流程序
hydraulic fracturing
fluid-solid coupling
discrete element method（DEM）
particle flow code
