水利学报2017，Vol.48Issue(5)：576-587,12.DOI:10.13243/j.cnki.slxb.20160944
基于分形理论的坝基裂隙岩体注灰量与导水率关系研究
Research on the relationship between cement take and transmissivity of fractured rocks under dam foundation based on fractal theory
摘要
Abstract
Due to the imperceptibility and uncertainty of the fractures and cracks under the dam foundation,it is difficult to accurately evaluate the permeability and groutability of the fractured rocks.As a useful tool to describe the natural fracture networks,discrete fracture network can represent the statistical properties of the natural fracture networks,but it cannot reveal the microscopic characteristics and internal relations of the fractures in the fractured rocks.The fractal geometry,proposed by Mandelbrot,is an important tool to describe the characteristics of the fractal objects.The fractures distributed in fracture networks have been found to exhibit fractal characteristics,many researchers have studied the permeability of fracture networks by using this theory.However,the groutability and grout take of the fractured rocks have been rarely researched.In this paper,firstly,the fractal model of permeability and groutability for the fractured rocks are established,the equation of relationship between transmissivity and fractal dimension is derived.By comparing with the existing research results,the equation is proved to be reliable.Secondly,the fractal model of cement take for the fractured rocks grouting is analyzed,based on which the equation of relationship between cement take and transmissivity is derived.According to the delimitation by the curve of cement take vs transmissivity,the graph is divided into three grouting zones,which are defined as normal zone,tiny fracture zone and dilation zone,respectively.Finally,for verification purposes,the measured data from a cement grouting project in China are compared with the calculation values,the results show that the relationship between cement take and transmissivity derived in the paper is reliable,and defined grouting zones is reasonable and important.Therefore,the relationship and the grouting zones can used to predict and evaluate the reasonability and groutability of grouting.关键词
大坝基础/裂隙岩体/分形理论/水泥灌浆/导水率/注灰量Key words
dam foundation/fractured rocks/fractal theory/cement grouting/transmissivity/cement take分类
建筑与水利引用本文复制引用
樊贵超,钟登华,任炳昱,吴含,李晓超..基于分形理论的坝基裂隙岩体注灰量与导水率关系研究[J].水利学报,2017,48(5):576-587,12.基金项目
国家自然科学基金(51439005) （51439005）
国家重点基础研究发展计划(973计划)(2013CB035904) （973计划）
国家自然科学基金(51339003) （51339003）
