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to realize tool change operation at atmospheric pressure. Furthermore, the transformation project of freezing cutterhead and tool change maintenance method are put forward. Taking the shield construction of Huanxi Power Tunnel as an example, a numerical analysis of the freezing cutter head of the project was carried out. The results show that when the brine temperature is -25 °C, after 30 d......
progression model was obtained to classify the stability classification of surrounding rock. 12 samples of the first stage project in Guangzhou pump accumulator electricity station and 18 samples produced by the interpolation method were taken as the training samples. 22 samples of the second stage project were selected to verify this method. Compared with the artificial neural network (ANN) method......
: For the Guanshui Road Station tunnel project of Guiyang Metro Line 2, the wind pavilion group was moved out of the main tunnel to reduce the number of openings in the main tunnel, and the wind..., the optimal excavation involves excavating the lower running tunnel before the upper fresh air exhaust tunnel. In this project, the most reasonable excavation sequence of the tunnel is from top......
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电工钢边缘降控制研究陈胜利1,张建平1,何安瑞2,管长林3,王立涛1(1.安徽省马鞍山市马鞍山钢铁股份有限公司技术中心2.北京科技大学 高效轧制国家工程研究中心,北京 1000833.马鞍山钢铁股份有限公 司第一钢轧厂,安徽马鞍山 243000)摘 要:以马鞍山钢铁集团公司电工钢板形优化控制研究项目为背景,系统地研究了热轧,冷连轧和单机架轧机在电工钢生产过程中的边缘降控制问题.通过现场数据采集,工况数值模拟计算和工业化大生产试验,设计出适用,合理的电工钢板形控制的辊型优化曲线,满足了不同工序,不同机型的板形控制......
一种基于基元反应原理的沉降预测模型李磊1(1.北京市北京科技大学土木与环境工程学院)摘 要:现有沉降预测方法受其理论制约或简化性假设条件的影响,预测结果常不甚理想.通过分析沉降过程发展的特征,提出了一种基于基元反应原理的的沉降预测模型.将之用于某矿区工程沉降分析,取得理想效果,证明该模型有进一步推广应用的价值.关键词:沉降预测; 基元反应; 质量作用定律; 过程发展特征......
复杂岩质边坡的岩体力学参数变化规律研究隋智力1,乔兰1,李远1,杨志军1,孙歆硕2(1.北京市北京科技大学土木与环境工程学院2.国家知识产权局 专利审查协作中心)摘 要:根据工程实际情况,对复杂岩质边坡的地质条件进行分析,研究其岩体力学参数.运用试验方法和数值模拟方法分别研究了边坡开挖卸荷过程中岩体参数的量化,并通过FLAC数值模拟研究岩体参数的动态变化规律,将模拟结果与试验结果进行比较并进行修正.修正后的结果为边坡稳定性分析提供依据.关键词:复杂岩质; 卸荷; 岩体参数; 变化规律......
从选金尾矿中提取绢云母微粉新材料刘洪兴1,王仁生1,潘咏梅1,刘红1,刘卫华1(1.山东省威海市乳山市乳山市大业金矿)摘 要:乳山市大业金矿选金尾矿中绢云母含量高达23.3%.文中采用尾矿粗砂再磨,预选脱硫,贵金属矿物二次回收,脱硫尾矿再分级回收绢云母的选矿工艺,分别得到一级品,二级品,三级品3个等级的绢云母新材料,平均粒径达到3.59μm.该项目具有投资少,成本低,材料性能好,价格优的明显优势,经济效益,环境效益显著,值得借鉴和推广.关键词:选金尾矿; 浮选; 分级; 绢云母; 新材料......