岩体离散裂隙网络渗流应力耦合分析  

Stress-fluid Coupling Analysis in Fractured Rock Mass with the Theory of Discrete Fracture Networks

作　　者：张彦洪[1,2] 柴军瑞[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]甘肃农业大学水利水电工程系,甘肃兰州730070

出　　处：《应用基础与工程科学学报》2012年第2期253-262,共10页Journal of Basic Science and Engineering

基　　金：国家自然科学基金委员会;二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(50579092);甘肃省科技厅自然科学基金项目(1010RJZA163)

摘　　要：裂隙渗流具有沿裂隙网络做定向移动的特点,用非连续介质方法分析裂隙岩体渗流应力耦合更符合工程实际.本文以人工模拟的随机裂隙网络为对象,应用离散裂隙网络模型和节理单元模型,以裂隙开度变化为纽带,同时考虑渗透静水压力和动水压力的影响,研究水位变化条件下裂隙岩体渗流应力耦合特性.算例表明,考虑耦合作用时,岩体内部结点水头、结点应力和岩体渗流量会发生相应改变.岩体中水头大的裂隙段,耦合作用更加明显.在高坝工程岩体渗流分析和岩体稳定评价计算中,应当考虑渗流应力的耦合作用.Seepage in fractured rock mass has the peculiarity of orientation flow along network,so the stress-fluid coupling analysis results should more accord with engineering practice with the discrete media model instead of continuous one.The paper studies the stress-fluid coupled characteristics in fractured rock mass under the condition of water-changing upstream boundary using model of the discrete media and joints element based on the artificial simulated rock mass network.The method consider effects of all hydraulic loads both static and flowing water pressure acted on the crack surface,and reflect the coupling relation by opening change of joint element.Numerical cases show that the values of either water pressure or stress in fractured rock mass may vary in some degree when considering their coupling role.The results also indicate the coupling effects are more significant in regions where having some larger water head.So it is necessary to use the method of stress-fluid coupling to solve seepage and stress distribution in fractured rock mass when designing reservoir dam engineering or appraising stability of bank rock slope under the action of great water head.

关 键 词：岩体力学 渗流应力耦合 裂隙开度 离散裂隙网络模型 裂隙岩体 

分 类 号：TV122[水利工程—水文学及水资源]