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戴元志,李平,白银,唐建辉.低温下胶结充填体温度场和强度时变规律研究[J].河北工程大学自然版,2020,37(2):80-87
低温下胶结充填体温度场和强度时变规律研究
Study on the Time-varying Law of Temperature Field and Strength of Cemented Paste Backfill at Low Temperature
投稿时间:2020-02-21  
DOI:10.3969/j.issn.1673-9469.2020.02.013
中文关键词:  低温  胶结充填体  温度场  强度
英文关键词:low temperature  cemented paste backfill  temperature field  strength
基金项目:国家自然科学基金资助项目(41977240,51739008);中央高校基本科研业务费资助项目(B200202090)
作者单位
戴元志 河海大学 江苏河海工程技术有限公司, 江苏 南京 210098 
李平 河海大学 土木与交通学院, 江苏 南京 210098 
白银 南京水利科学研究院, 江苏 南京 210029 
唐建辉 河海大学 土木与交通学院, 江苏 南京 210098 
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中文摘要:
      为了认识矿山低温充填环境对胶结充填体的强度影响机理,采用基于成熟度理论的b4cast有限元软件,对大尺度充填体进行建模分析,获得低温充填环境下胶结充填体温度场和强度的时变规律。通过对胶结充填体进行X射线衍射(XRD)和扫描电镜分析(SEM),揭示了低温下胶结充填体的固化机理。结果表明:在5℃的初始充填温度下,从充填体中心至围岩处,充填体的温度和强度呈现逐渐增大的规律;大尺度充填体内部温度上升的十分缓慢,充填28 d时的中心温度仅达到12.5℃;通过XRD和SEM分析发现,胶结充填体内的主要水化产物是钙矾石和C-S-H凝胶,低温下钙矾石的生成速率决定着胶结充填体早期强度的发展。
英文摘要:
      In order to understand the influence mechanism of low temperature on the strength of cemented backfill, a large-scale cemented backfill model was modeled and analyzed by using b4cast finite element software based on maturity theory. The time-varying law of temperature field and strength of the cemented backfill in low-temperature backfilling environment were obtained. In addition, the curing mechanism of cemented backfill at low temperature was revealed by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that at the initial filling temperature of 5℃, the temperature and strength of the cemented backfill increase gradually from the center of the filling body to the surrounding rock. The temperature inside the large-volume cemented backfill rises very slowly, and the central temperature only reaches 12.5℃ after 28 days. Through XRD and SEM analysis, it is found that the main hydrates in cemented backfill are ettringite and C-S-H gel. The formation rate of ettringite in low temperature determines the development of early strength of cemented backfill.
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