摘要
坝基灌浆工程地质条件复杂且具有隐蔽性,如何建立能准确反映岩体内裂隙分布情况的三维随机裂隙网络模型,并进行浆液扩散特征的研究是灌浆数值模拟的关键和难点。现有研究大多通过岩体揭露面统计资料估计裂隙的几何参数,无法有效反映复杂裂隙真实特征,且灌浆模拟研究中多将裂隙简化为单一裂隙或规则裂隙网络。本文采用Monte Carlo法建立三维随机裂隙网络模型;提出三维裂隙宾汉姆流体灌浆数学模型,实现对随机裂隙内宾汉姆浆液扩散特征的研究;运用该模型对某水电站坝基裂隙岩体灌浆过程进行模拟,结果表明:浆液主要在与灌浆孔相交的裂隙内流动,灌浆压力在灌浆孔附近衰减速率最快且对浆液扩散的影响较为显著。同传统裂隙灌浆模拟相比,该方法能有效反映复杂裂隙的真实特征,获取更贴近实际工程的灌浆结果,为保障灌浆工程的安全建设和经济合理性提供了理论依据。
It is important to have a good understanding of the accuracy of 3D fracture network model and the spread process of the grouting. Current 3D geological model are not efficient and cost-effective in visual- izing complex fracture distribution for grouting simulation. Researches on grouting simulation simplified the stochastic fracture as one planar fracture or regular fracture network. To solve the above problems, the Car- lo Monte method is adopted and a 3D stochastic fracture network model is established. Considering Bing- ham fluid characteristic, a three-dimensional grouting model is proposed. The bedrock curtain grouting of a hydropower station is taken as a case. The results show that the grout almost flows in the fractures that pass through the borehole, and grouting pressure decreases the fastest near the borehole and affects the dif- fusion markedly. Compared with the traditional results, this method can not only reveal the actual fractures features, but also obtain more reliable simulation results,which provides a reliable theoretical basis for engi- neering safety and economic efficiency.
出处
《水利学报》
EI
CSCD
北大核心
2017年第8期945-954,共10页
Journal of Hydraulic Engineering
基金
国家自然科学基金创新研究群体科学基金项目(51621092)
国家自然科学基金重点项目(51439005
51339003)
