胶结充填体固结全程电阻率特性试验

发布时间：2018-04-03 12:52

本文选题：胶结充填体　切入点：电阻率　出处：《中国矿业大学学报》2017年02期

【摘要】：通过开展不同灰砂质量配比、料浆质量分数和养护龄期条件下的胶结充填体固结全程电阻率和单轴抗压强度试验,对胶结充填体固结全程电阻率特性及其强度的关联性进行研究.基于胶结充填体的等效电路,综合考虑不同龄期的水化反应产物的类型及形态等微观结构影响因素,揭示了胶结充填体固结全程的电阻率变化机制,并推导了其电阻率模型;结合强度测试数据,构建了胶结充填体单轴抗压强度与其电阻率定量关系方程.结果表明:胶结充填体的电阻率具有与养护龄期相同的发展趋势,即电阻率先降至最低点,而后遵循先快后慢的增长规律;灰砂质量配比越小、质量分数越高,其电阻率越大;电阻率的变化规律与其内部微观结构密切相关,根据电阻率曲线发展特点,可将充填体固结全程分为5个阶段;充填体的单轴抗压强度和电阻率增长规律基本一致,且两者间存在明显的对数关系.
[Abstract]:Through the tests of the whole process resistivity and uniaxial compressive strength of cemented backfill under the conditions of different ratio of lime and sand mass, mass fraction of slurry and curing age,In this paper, the relationship between the electrical resistivity and the strength of cemented backfill during the whole process of consolidation is studied.Based on the equivalent circuit of cemented filling body and considering the influence factors of microstructure such as the type and shape of hydration reaction product at different ages, the mechanism of resistivity variation in the whole consolidation process of cemented filling body is revealed, and its resistivity model is deduced.Based on the strength test data, a quantitative equation of uniaxial compressive strength and resistivity of cemented backfill was established.The results show that the resistivity of cemented filling body has the same developing trend as that of curing age, that is, the resistance first drops to the lowest point, then follows the law of fast growth and then slow growth, the smaller the mass ratio of lime sand, the higher the mass fraction, the greater the resistivity.The variation law of resistivity is closely related to its internal microstructure. According to the characteristics of resistivity curve development, the consolidation of filling body can be divided into five stages, the uniaxial compressive strength of filling body is basically consistent with the increasing law of resistivity.And there is an obvious logarithmic relationship between them.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;金属矿山安全与健康国家重点实验室;
【基金】：国家自然科学基金项目(51504256) 国家重点基础研究发展计划(973)项目(2013CB227903) 国家科技支撑计划课题(2013BAB02B04) 金属矿山安全与健康国家重点实验室(ZDSYS006)
【分类号】：TD853.34

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