水利学报2019，Vol.50Issue(4)：463-474,12.DOI:10.13243/j.cnki.slxb.20181008
大理岩裂隙渗流特性及充填砂土影响
Seepage characteristic of marble fracture and effect of filling sands
摘要
Abstract
Filled and unfilled fracture seepage tests were conducted on 9 marble samples with different morphology surfaces by self-made rock fracture seepage test system. The effects of loading and unloading process, feeding water head, fracture surface morphology, filled sand particle size and thickness on fracture seepage under different normal stress conditions were studied. The results show that when the fracture is not filled, in the normal loading stage, the seepage flow increases linearly with the increase of feeding water head, and decreases negatively exponentially with increase of normal stress. The relationship between seepage flowrate and normal stress was obtained by embedding a 3 D morphology parameter Sq (slope root mean square). The flowrate per head increases exponentially with mechanical aperture and the average index is 3.01, thus a modified Cubic law is proposed and the modified parameters have exponential function relations with Sq of the rock fracture surfaces. In the unloading stage, the effect of normal stress on flowrate is greatly reduced and the flowrate almost keeps unchanged with the decrease of normal stress. Comparing with the unfilled marble fractures, the effects of fracture closure, fracture surface morphology and normal stress on fracture flowrate are reduced when the fracture is filled with sands. The flowrate per head increases when the filled sand size or the filled sand thickness is bigger on the whole.关键词
渗流试验/法向应力/三维形貌参数/渗流量/充填裂隙Key words
seepage test/normal stress/3D morphology parameter/flowrate/filled fracture分类
建筑与水利引用本文复制引用
郭保华,程坦,陈岩,焦峰..大理岩裂隙渗流特性及充填砂土影响[J].水利学报,2019,50(4):463-474,12.基金项目
国家自然科学基金项目(51109076) （51109076）
