孔隙率和颗粒破碎率对尾矿材料饱和导流率的影响

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.2.159
Changkun Ma, Chao Zhang, Qinglin Chen, Zhenkai Pan, Lei Ma
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引用次数: 2

摘要

尾矿在不同区域由于泥沙淤积和分选的影响,其粒度存在差异。孔隙率和颗粒破碎率对高堆垛滑石材料的饱和导电性有重要影响。采用自行研制的高应力渗固结试验装置进行了渗固结试验。随着固结压力的增大,水导率呈非线性降低。粗颗粒尾砂的渗流模式为通道流,细颗粒尾砂的渗流模式为分散流。不同粒径的尾矿在高固结压力下的水力导率变化率趋于一致。在粗颗粒尾砂中存在导流滞后现象。水头越低,水力传导迟滞越明显。通过引入有效孔隙比和破坏指数的概念,推导了新的导水率-孔隙比方程。该方程综合了不同粒径在大范围固结压力下的水力导电性方程。
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On the effect of void ratio and particle breakage on saturated hydraulic conductivity of tailing materials
Particle size of tailings in different areas of dams varies due to sedimentation and separation. Saturated hydraulic conductivity of high-stacked talings materials are seriously affected by void ratio and particle breakage. Conjoined consolidation permeability tests were carried out using a self-developed high-stress permeability and consolidation apparatus. The hydraulic conductivity decreases nonlinearly with the increase of consolidation pressure. The seepage pattern of coarse-particle tailings is channel flow, and the seepage pattern of fine-particle tailings is scattered flow. The change rate of hydraulic conductivity of tailings with different particle sizes under high consolidation pressure tends to be identical. A hydraulic conductivity hysteresis is found in coarse-particle tailings. The hydraulic conductivity hysteresis is more obvious when the water head is lower. A new hydraulic conductivity-void ratio equation was derived by introducing the concept of effective void ratio and breakage index. The equation integrated the hydraulic conductivity equation with different particle sizes over a wide range of consolidation pressures.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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