With the improvement of mineral processing technology,the amount of tailings in storage is increasing year by year,and the particle size of tailings is getting finer and finer.However,such tailings have poor permeability,good water holding performance,long consolidation time and low mechanical strength.Such tailings often have problems such as difficult drainage,slow deposition and poor stability in the process of dam-filling.In the complex climate and geographical environment,rainfall infiltration,water evaporation,repeated rise and fall of saturation line (that is,under the condition of dry-wet cycle),earthquake and so on will be encountered.These factors can not be ignored for the settlement of fine tailings pond.In order to help calculate the settlement distance of tailings deposit and guide ore drawing and tailings dam construction,the influence of dry-wet cycle and moisture content on the compression consolidation characteristics of tailings of a metal tailings pond in Hunan Province was studied.The tailings with water content of 10%,12%,14%,16% and 18% were subjected to 0~5 times of dehumidification-moisture absorption-dehumidification tests respectively,and rapid consolidation tests were carried out on the samples with the help of GZQ-1 automatic high-pressure consolidation instrument.The results show that:(1)Under the same conditions,the void ratio decreases with the increase of pressure.Without the dry-wet cycle,the void ratio of the sample at the optimum moisture content is the smallest,and the void ratio of natural moisture content,optimum moisture content and saturated moisture content changes in a U-shaped curve in turn.After the dry-wet cycle,the volume of tailings sample expands slightly,and the internal water-gas channel changes.After graded loading,the internal particles fill the pores,and finally the structure tends to be stable.(2)Under the same number of cycles,the compression coefficient increases with the increase of water content, Under the same moisture content,the compression coefficient changes in a “Λ” shape with the increase of the number of dry-wet cycles.The number of dry-wet cycles and moisture content can increase the compactness of tailings and reduce the compression coefficient by changing the bonding effect and capillary water pressure of tailings cement.(3)Without drying-wetting cycle,the con-solidation coefficient first rises and then decreases with the increase of water content. At the same moisture content,the change of consolidation coefficient is approximately M-shaped with the increase of the number of dry-wet cycles.The stress in the early cycle process is mainly dominated by capillary water pressure.When the particles move stably and the pore structure of tailings is fully developed,the stress is dominated by cohesive force and friction force.Through the above three points,we can understand the stress characteristics of tailings sand consolidation process,assist in calculating the settlement distance of tailings accumulation,and guide ore drawing and sub-dam construction.Monitoring the environmental temperature and precipitation,controlling the water content of tailings and the accumulation period of tailings can improve the economic benefit and stability of tailings dam.
WANG Zhonghui, WANG Qianfu, TIAN Yakun, WU Lingling, YU Xueyang, ZHANG Zhijun. Study on Consolidation Characteristics of Tailings with Different Moisture Content Under Dry-Wet Cycle[J]. Gold Science and Technology, 2022, 30(1): 54-63 doi:10.11872/j.issn.1005-2518.2022.01.092
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
Estimation of Soil Water Characteristic Curves (SWCC) of mining sand using soil suction modelling
1
2019
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
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2018
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
Experimental investigation of microscopic deformation mechanism of unsaturated compacted loess under hydraulic coupling conditions
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2021
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2019
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2018
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2020
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2011
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2019
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2018
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2010
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2013
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2020
Development law and influencing factors of expansive soil cracks under the action of dry and wet cycles
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2017
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2017
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2018
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2021
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Influences of drying-wetting-freeze-thaw cycles on soil-water and shrin-kage characteristics of expansive soil
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循环脱吸湿与加卸载耦合作用下土体持水性能试验研究
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2019
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
干湿循环后膨胀土力学特性的真三轴试验研究
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2021
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
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1
2020
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...
... 在尾矿子坝安全运行过程中,经历多次降雨与水分挥发,其浸润线会反复变化.国内外学者发现干湿循环会使土体出现疲劳迹象(Al-Homoud et al.,1995)、开裂(Julina et al.,2018;谭波等,2021)、持水性能下降(陈勇等,2019),导致土体力学性能下降,并造成地基沉降(李知翰,2019);含水率通过影响土体的微观结构(巩学鹏等,2019)、土—水特征曲线(Azmi et al.,2019; Gapak et al.,2018; Esta-bragh et al.,2020)、抗剪强度(李怀鑫等,2020)使土体的稳定性发生改变,此过程中也对土体沉降(武亚军等,2018)造成了影响;干—湿循环条件下不同含水率通过影响土体的基质吸力(方瑾瑾等,2021;赵贵涛等,2021)和剪切强度(胡长明等,2018;郝延周等,2021),进而影响土体结构的稳定性.因此,干湿循环和含水率对于尾矿子坝的强度、固结沉降以及稳定性造成的影响不容忽视. ...