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Factors influencing the pumpability of unclassified tailings slurry and its interval division

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 417-429页

作者： Peng Li Yun-bing Hou mei-feng cai School of Civil and Resource Engineering University of Science and Technology Beijing Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education of China) University of Science and Technology Beijing Beijing Key Laboratory of Urban Underground Space Engineering University of Science and Technology Beijing School of Resource and Safety Engineering China University of Mining and Technology (Beijing)

Tailings consolidation and discharging technology is currently a popular means for disposing tailings in China. In this study, we describe a laboratory investigation of the unclassified tailings slurry from an iron mine and analyze the influence of the concentration,amount of consolidation agent, and types of consolidation agent on the pumpability in terms of the slump, slump flow, and bleeding rate of the slurry. The results indicate that an increase in concentration leads to a pronounced decrease in the magnitude of the slump, slump flow,and the bleeding rate. Compared with the consolidation agents P.O42.5 and P.S.A32.5, the new consolidation agent offers substantial advantages in promoting the pumping performance of the slurry. The concentration more strongly affects the slump, slump flow, and the bleeding rate of the slurry than does the amount of the consolidation agent. We also constructed the pumpability interval of the slurry on the basis of the slump and bleeding rate and accordingly determined the proportioning parameters of the slurry with a concentration of 75 wt% to79 wt% and with a consolidation agent concentration of 2 wt%. In addition, we discussed the pumpability mechanism of the slurry.

关键词： tailings consolidation and discharging technology unclassified tailings new consolidation agent pumpability interval pumpability mechanism

FLAC在地下巷道离层破坏非线性数值模拟中的应用

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西安科技学院学报 2000年第3期20卷 193-195,217页

作者：来兴平伍永平蔡美峰北京科技大学资源工程学院北京100083 西安科技学院科研处陕西西安710054

岩体力学问题的决策所涉及的因素如地质、岩体结构特征、岩体力学性质、工程特征、生产、施工及其它信息大多数都是不确定的 ,也就是说以上这些信息呈模糊性、随机性、未确定性和不完全性。本文主要探讨岩石力学非线性计算软件—FLAC2D3... 详细信息

岩体力学问题的决策所涉及的因素如地质、岩体结构特征、岩体力学性质、工程特征、生产、施工及其它信息大多数都是不确定的 ,也就是说以上这些信息呈模糊性、随机性、未确定性和不完全性。本文主要探讨岩石力学非线性计算软件—FLAC2D3 .3在地下巷道层破坏数值计算中的应用。

关键词：离层破坏岩石力学非线性计算软件地下巷道

基于过程分析的地下软弱层状岩石巷道破坏的相似模拟试验研究

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包头钢铁学院学报 2000年第1期19卷 6-10页

作者：刘占魁来兴平蔡美峰包头钢铁学院资源工程系西安矿业学院采矿工程系北京科技大学资源工程学院北京100083 北京科技大学资源工程学院

对模拟实验原理进行了阐述 ,结合现场实际破坏特征 ,对软弱层状岩石巷道的破坏过程进行了相似模拟实验 ,根据试验结果和计算机仿真结果 ,对其破坏过程进行了分析。

关键词：过程分析软岩巷道破坏相似模拟

Characteristics and implications of stress state in a gold mine in Ludong area, China

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International Journal of Minerals,Metallurgy and Materials 2018年第12期25卷 1363-1372页

作者： Peng Li mei-feng cai Qi-feng Guo Sheng-jun Miao School of Civil and Resource Engineering University of Science and Technology Beijing Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education of China) University of Science and Technology Beijing Beijing Key Laboratory of Urban Underground Space Engineering University of Science and Technology Beijing

In this study, we obtained information from twenty-one measurement points on the stress magnitudes and orientations of a gold mine in the Ludong area. We used the overcoring technique with an improved hollow inclusion strain gauge and then analyzed the distribution characteristics of the in situ stress field. The results indicate that the stress field is characterized by σH > σh > σv and σH > σv > σh(where σH, σh, and σv are the maximum horizontal, minimum horizontal, and vertical principal stresses, respectively). The regional stress field is dominated by horizontal principal stress. The σH, σh, and σv values show a gradual increasing trend with depth. The σH is predominantly oriented in the NWW–SEE or near-EW direction. We also confirmed the correspondence between the measured stress field and the regional geological structure. In addition, based on the measured stress data, we discuss the implications of the in situ stress with respect to fault activity in the mine area.

关键词： in situ stress measurement improved hollow inclusion strain gauge stress field geological structure fault activity

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 135-142页

作者： Zhuo-ying Tan Si-jing Wang mei-feng cai State Key Laboratory of High-Efficient Mining and Safety of Metal Mines Ministry of Education of China Beijing 100083 China School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China School of Civil Engineering Tsinghua University Beijing 100084 China

An instrumented drilling system can be applied for the acquisition of drilling process parameters. The system can provide continuous and huge data for geotechnical engineering. However, due to the complexity of ground strata, the variation in the drilling parameters with stratigraphical characteristics is great and the correlation between likely comparable parameters is not high, which limits the use of conventional correlation approaches in this field. How to use the data for engineering and how to get a reasonable interpretation for the relationships among the drilling parameters, as well as between a drilling parameter and formational characteristics, become a technical choke point for the development and application of the instrumented drilling system. Based on similarity criteria, the extraction of sample data and characteristics, the pretreatment of data and feature matching algorithms have been analyzed and an approach of slope coefficient searching identification has been established. A case study was carried out for the similarity between the rotational speed of the drill bit, flushing pressure, and effective thrust force graphics in general weathered granite. The result shows that the similarity coefficients between the rotational speed of the drill bit, flushing pressure, and effective thrust force are 0.72 and 0.83, respectively. Although there are differences between the distances of the graphics, the curves of both rotational speed and flushing pressure agree with the effective thrust curve in shape, which provides a possible method for the identification of various formations by use of the similarity between feature drilling parameters.

关键词： rock drilling process parameters similarity identification slope coefficient

高放废物地质处置库预选缓冲材料压缩性能研究

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铀矿地质 2007年第2期23卷 91-95页

作者：刘月妙蔡美峰王驹温志坚北京科技大学土木与环境工程学院北京100083 核工业北京地质研究院北京100029

缓冲材料是高放废物深地质处置多重屏障系统中非常重要的一道人工屏障,内蒙古高庙子钠基膨润土被确定为我国高放废物深地质处置缓冲材料的首选基料。通过研究该钠基膨润土(GMZ01)在不同含水量条件下的压实成型性、不同压实干密度和不同... 详细信息

缓冲材料是高放废物深地质处置多重屏障系统中非常重要的一道人工屏障,内蒙古高庙子钠基膨润土被确定为我国高放废物深地质处置缓冲材料的首选基料。通过研究该钠基膨润土(GMZ01)在不同含水量条件下的压实成型性、不同压实干密度和不同含水量压实样品的无侧限压缩性能,认为:含水量为15%的高庙子天然钠基膨润土压实成型性最好,压实干密度越大,无侧限抗压强度越大;在无侧限压缩实验时,含水量为15%的高密度压实膨润土样品比含水量为10%和20%的样品的抗压强度大,变形小。

关键词：高放废物深地质处置钠基膨润土压实成型性抗压强度

PTTG沉默通过下调糖酵解相关酶抑制卵巢癌细胞增殖

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中国妇幼健康研究 2016年第11期27卷 1343-1347页

作者：王秀杨爱君蔡凤梅王海燕冯燕西安市第四医院妇产科陕西西安710004 西安交通大学附属第一医院妇产科陕西西安710061

目的：探讨原癌基因垂体肿瘤转化基因（ PTTG）对卵巢癌细胞增殖的影响及其机制。方法收集西安市第四医院医院2010至2013年有完整病例资料的卵巢癌手术患者病理标本68例。通过免疫组织化学和Western blotting方法，从组织和细胞水平检测... 详细信息

目的：探讨原癌基因垂体肿瘤转化基因（ PTTG）对卵巢癌细胞增殖的影响及其机制。方法收集西安市第四医院医院2010至2013年有完整病例资料的卵巢癌手术患者病理标本68例。通过免疫组织化学和Western blotting方法，从组织和细胞水平检测PTTG与有氧糖酵解相关酶包括己糖激酶（ HK ）、磷酸果糖激酶（ PFK ）、丙酮酸激酶2（ PKM2）、乳酸脱氢酶 A （LDHA）和葡萄糖转运子1（GLUT-1）表达水平间的关系；利用慢病毒干扰载体下调PTTG表达，建立PTTG沉默的稳定卵巢癌细胞株，通过MTT、软琼脂糖克隆实验检测细胞的增殖能力改变；Western blotting检测PTTG沉默后有氧糖酵解相关酶和葡萄转运子的表达水平变化，并探讨其内在机制。结果通过组织和细胞水平检测发现，PTTG的表达水平与有氧糖酵解相关酶HK、PFK、PKM2、LDHA及GLUT-1表达水平呈正相关性（相关系数r＝0．839～0．987区间，均P＜0．01），慢病毒干扰载体沉默PTTG后，卵巢癌细胞的增殖能力显著受到抑制，有氧糖酵解相关酶的表达水平也显著下降（干扰前后灰度2．212±0．36 vs 0．782±0．18，t＝2．36，P＜0．01）。 Western blotting检测正常卵巢及卵巢癌组织PTTG、LDHA、PKM2和GLUT－1的表达情况，结果与免疫组化结果相一致，即在正常的卵巢组织中PTTG表达微弱（灰度为0．705±0．13，n＝13），而在卵巢癌组织中呈现高表达（灰度为2．616±0．33，n＝58），并与卵巢癌组织的恶性分化呈正相关性（Pearson检验r＝0．908，P＝0．012）。结论 PTTG可能通过降低有氧糖酵解反应过程中的相关调节酶的表达水平，而实现其抑制有氧糖酵解代谢的作用，从而抑制卵巢癌细胞的快速增殖。

关键词：卵巢癌垂体肿瘤转化基因有氧糖酵解细胞增殖

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结膜痣166例临床病理分析

临床与实验病理学杂志 2022年第1期38卷 46-50页

作者：赵荧蔡凤梅刘萃红刘辉杨菁茹王卉芳西安市人民医院(西安市第四医院)病理诊断中心西安710004 西安市人民医院(西安市第四医院)眼整形与眼眶病中心西安710004

目的探讨结膜痣的临床病理学特征。方法收集2014年3月~2019年3月西安市人民医院(西安市第四医院)诊治的166例结膜痣,回顾性分析其临床病理学特征,并复习相关文献。结果166例结膜痣患者年龄3~82岁,平均30岁,中位年龄36岁。男性74例,女性9... 详细信息

目的探讨结膜痣的临床病理学特征。方法收集2014年3月~2019年3月西安市人民医院(西安市第四医院)诊治的166例结膜痣,回顾性分析其临床病理学特征,并复习相关文献。结果166例结膜痣患者年龄3~82岁,平均30岁,中位年龄36岁。男性74例,女性92例,男女比为0.8∶1,发病部位以左眼多见,双眼同时发生2例。首次发现年龄以≤20岁者最多见。临床大多无症状。125例(125/166,75.4%)为普通结膜痣,痣细胞呈巢团状排列,具有极向,可见成熟现象;1例(1/166,0.6%)为非典型结膜痣,斑块位于泪阜,痣细胞体积小,弥漫性分布,缺乏成熟现象,具有活跃的结膜交界活动;40例(40/166,24.1%)为青少年结膜痣,痣细胞具有“非典型性”,缺乏成熟现象,具有活跃的结膜交界活动,上皮与结膜固有层的交界处被相互融合的痣细胞团取代,疑似侵犯上皮。166例患者术后随访12~72个月,平均40.5个月,均恢复良好,无复发。结论结膜痣是发生于特殊部位的良性痣细胞增生性病变。青少年结膜痣具有独特的临床病理学特征,病理医师应防止误诊或过度诊断,成年结膜痣显示恶性变特征时应予以重视。

关键词：结膜痣青少年结膜痣临床病理特征

NUMERICAL RESEARCHES ON INTERACTION BETWEEN PROPELLERS IN UNIFORM FLOW

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Journal of Hydrodynamics 2012年第5期24卷 675-683页

作者： feng Xue-mei LU Chuan-jing WUQiong cai Rong-quan School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240China Marine Design and Research Institute of China Shanghai 200011 China

Numerical simulations of the flow around two bidirectional staggered propellers are conducted in uniform flow. The computed open water performance of the fore-propeller is compared with the corresponding experimental results, and the influence of the fore-propeller on the aft one is carefully investigated. It is found that the inflow around the aft propeller close to the side of the fore is especially affected by the fore one, leading to abnormal circumferential distribution of force on the blade in the shade region. For either forces or velocity distributions, the abnormal changes behave contrarily for cases with the rotating speed larger or smaller than the idle. Moreover, the more the rotating speed of the fore differs from the idle, the larger the abnormal values become.

关键词： numerical simulation interaction propellers open water performance