冻融循环对全尾砂固结体电阻率影响研究
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摘要
冻融循环作用对全尾砂固结体造成一定损伤,电阻率作为固结体的重要物理参数必然发生变化,因此可以用电阻率的变化来衡量固结体的损伤。为研究冻融循环次数和固结体电阻率的定量关系,制作(灰砂比为1∶4,1∶8,1∶10共3种配比;每种配比包含3,7,28d三个养护龄期,)共九组18个试件。每组试件经过0,5,10,15,20次冻融循环后,测定固结体试件电阻率变化情况。建立了固结体电阻率与冻融循环次数的关系;基于三元导电模型建立固结体电阻率模型。研究结果表明:固结体试件电阻率与冻融循环次数呈明显的指数关系,且随着冻融循环次数的增加不断减小,前5次冻融循环过程中电阻率减小量最大,其后逐渐减小。通过电阻率模型,可以计算出经过不同冻融循环次数后固结体的电阻率。研究成果对固结体损伤探测有重要参考价值。
The freeze-thaw cycle causes certain damage to the full tailings consolidation body,and the resistivity will affirmatively change as an important physical parameter of the consolidation body.Therefore,the change of resistivity can be used to measure the damage of consolidation.In order to research the quantitative relationship between the number of freeze-thaw cycles and the resistivity of the consolidation body,a total of 9 sets of 18 samples were produced,in which the ratios of ash to sand were 1∶4,1∶8 and 1∶10,and each of the ratios included three curing ages of 3,7 and 28 d.After 0,5,10,15 and 20 times of freeze-thaw cycles,the resistivity change of each consolidated body was measured.Then,the relationship between the resistivity of consolidation body and the number of freeze-thaw cycles was established.The resistivity model of the consolidation body was established based on the ternary conduction model.The results showed that the resistivity of the consolidation sample had an obvious exponential relationship with the number of freeze-thaw cycles,and would decrease gradually with the increase of freeze-thaw cycles.During the first five freeze-thaw cycles,the resistivity decreased the most,and then reduced gradually.The resistivity model could be used to calculate the resistivity of the consolidation body after different freeze-thaw cycles.The research results had an important reference value for consolidation damage detection.
The freeze-thaw cycle causes certain damage to the full tailings consolidation body,and the resistivity will affirmatively change as an important physical parameter of the consolidation body.Therefore,the change of resistivity can be used to measure the damage of consolidation.In order to research the quantitative relationship between the number of freeze-thaw cycles and the resistivity of the consolidation body,a total of 9 sets of 18 samples were produced,in which the ratios of ash to sand were 1∶4,1∶8 and 1∶10,and each of the ratios included three curing ages of 3,7 and 28 d.After 0,5,10,15 and 20 times of freeze-thaw cycles,the resistivity change of each consolidated body was measured.Then,the relationship between the resistivity of consolidation body and the number of freeze-thaw cycles was established.The resistivity model of the consolidation body was established based on the ternary conduction model.The results showed that the resistivity of the consolidation sample had an obvious exponential relationship with the number of freeze-thaw cycles,and would decrease gradually with the increase of freeze-thaw cycles.During the first five freeze-thaw cycles,the resistivity decreased the most,and then reduced gradually.The resistivity model could be used to calculate the resistivity of the consolidation body after different freeze-thaw cycles.The research results had an important reference value for consolidation damage detection.
引文
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[2]范云松,等.冻融循环作用下英安岩力学及损伤特性研究[J].水电能源科学,2017(11):99-102.
[3]杨培冰.冻融循环作用下预应力混凝土梁疲劳特性研究[D].郑州:郑州大学,2017.
[4]刘杰,徐春霖,王瑞红.冻融循环作用下损伤砂岩物理特性研究[J].水力发电学报,2016,35(5):123-130.
[5]姜自华,姚兆明,陈军浩.冻融循环和含水率对砂岩单轴抗压强度的影响[J].矿业研究与开发,2017,37(1):85-88.
[6]刘泉声,黄诗冰,康永水,等.岩体冻融疲劳损伤模型与评价指标研究[J].岩石力学与工程学报,2015,34(6):1116-1127.
[7]魏作安,杨永浩,徐佳俊,等.人工冻结尾矿力学特性单轴压缩试验研究[J].东北大学学报(自然科学版),2016,37(1):123-127.
[8]苏伟,唐绍辉,唐海燕,等.冻融循环条件下花岗斑岩物理性质的试验研究[J].矿业研究与开发,2012,32(2):100-103.
[9]杨振威,严加永,刘彦,等.高密度电阻率法研究进展[J].地质与勘探,2012,48(5):969-978.
[10]付伟.单轴压缩与冻融作用下粉质粘土电阻率特性试验研究[D].武汉:中国科学院武汉岩土力学研究所,2009.
[11]赵祚琛.水泥固化煤制气废水污染土的电阻率特性研究[D].呼和浩特:内蒙古工业大学,2017.
[12]刘霖,樊振祥,郝伟.水泥土在冻融循环及污染水作用下强度特性及电阻率特性的研究[J].内蒙古农业大学学报(自然科学版),2016,37(2):67-73.
[13]侯云芬,王玲,吴越恺,等.冻融循环过程中砂浆电阻率变化及其机理分析[J].粉煤灰综合利用,2015(1):3-10.
[14]徐文彬,田喜春,邱宇,等.胶结充填体固结全程电阻率特性试验[J].中国矿业大学学报,2017,46(2):265-272.