香港现役钢筋混凝土连梁的抗震性能试验研究

通过5个钢筋混凝土连梁模型的伪静力试验，初步考察了香港地区未考虑抗震设防的现役钢筋混凝土连梁的抗震性能，讨论了不同设计参数对连梁抗震性能的影响，并与国外其他学者的试验结果进行了比较。     

倾斜布管采控天然冷量的青藏铁路路基温度场演变规律

Aiming at the stabilization of Qinghai-Tibetan Railway embankment during its construction and run, the method using tilt pipes to keep the permafrost embankment stabilization is put forward in the paper. By gathering natural cold energy in the winter and release it in the summer the tilt pipes can keep the permafrost embankment stabilizing. The temperature fields of the embankment and the stratums below are studied according to the condition of pipes diameter 250mm, length 7. 0m and tilt angle 30°,45°, 60° until the railway working for 20 years. It is shown that the embankment field using tilt pipes will eliminate the thawing core and come into subzero temperature phase ahead of 9 years compared with the original model. Different tilt angles have different efforts on the embankment and stratums, synthesis analysis of thermal income and expenses of the embankment and stratums should be carried out     

甘肃北山红石山地区晚石炭世英云闪长岩锆石U- Pb年龄、地球化学特征及构造意义

笔者等以出露于红石山—百合山蛇绿混杂岩带南侧的英云闪长岩体为研究对象,通过野外地质调查和岩石学、地球化学、锆石LA-ICP-MS U-Pb年代学研究,探讨其成因、构造环境及红石山洋俯冲消亡过程。岩石地球化学研究表明,红石山南英云闪长岩体富硅(SiO₂=63.95%～66.22%)、高铝(Al₂O₃=15.31%～16.61%)、富钠(Na₂O=3.73%～4.33%)、低钾(K₂O=1.00%～1.85%),相对高锶(Sr=246.0×10^-6～417.0×10^-6)、低钇(Y=8.83×10^-6～11.80×10^-6),富集Rb、Sr等大离子亲石元素和LREE,亏损Nb、Ta、Ti、P等高场强元素,HREE相对亏损,无明显Eu异常。岩石学和岩石地球化学特征表明,为俯冲洋壳脱水熔融的产物。锆石LA-ICP-MS U-Pb测年表明,红石山南英云闪长岩体的形成年龄为306.9～309.9 Ma,...     

土耳其天然碱矿水平对接井水溶开采技术回顾

土耳其是世界上最早应用定向对接井进行天然碱商业化开采的国家,其所使用的核心技术——对接井水溶开采技术,就是引进我国自主研发的定向水平对接井水溶开采技术。与常规旱采方法相比,该技术具有劳动强度低、人工成本少、不排放尾矿、绿色环保等优点。在过去10多年里,我国以对接井水溶开采技术为依托,深度参与了土耳其贝帕扎里和卡赞两大碱矿从试验到生产的开发,在整个工程实施过程中持续对开采井组模式、定向器具、井底钻具总成、测井仪器等进行了改进,尤其是磁中靶系统方面取得了突出成果和广泛应用,开发了第四代“慧磁”钻井中靶导向系统,设计施工了三井组模式。一方面,通过该项技术的应用使土耳其天然碱资源得到广泛开发,其纯碱工业在世界上占有了一席之地;另一方面,通过广泛的生产实践进一步推动了定向钻探技术的发展,提升了我国定向水平对接井技术水平。     

基于选煤技术的国内外煤炭洗选业发展对比探究

我国的煤炭洗选业比起发达国家,发展的时间较短,且国外有大量先进的选煤设备,而我国现阶段的选煤设备的现代化程度还有待提升,原煤入选率也待提高。文章从洗煤业起步时间、原煤入选率、选煤厂建设规模、选煤厂设备、选煤技术等方面入手,对我国与国外煤炭洗选业的发展进行深入、全面的对比分析,希望能促进我国煤炭选洗业的发展。     

煤层气多分支水平井技术探讨

煤层气多分支水平井是集钻井、完井及增产措施为一体的煤层改造技术,近年来在国内有较大发展。结合国内当前煤层气多分支水平井的发展状况,对其技术难点和关键技术进行讨论,并得出几点认识。     

采控冷量维护冻土路基稳定的模拟试验研究

The stability of railway subgrade in permafrost regions is crucial to the safety of railway operation. In this paper, we first analyze the main factors influencing the stability of frozen subgrade. Then,we build an experimental equipment in which regulation-tubes are arranged axially in subgrade and arranged slantways at the foot of slopes, and make the model experiments on maintaining the stability of frozen subgrade by collecting- controlling cold energy. The experiments include two groups. One is maintaining the stability by collecting-controlling natural cold energy in winter, and another is maintaining the stability by collecting-controliing natural cold energy in winter and artificial cold energy in summer. Finally, we obtain the behavior of temperature fields in the subgrade during the experiments,which establishes basis for further study on the subgrade stability and on the feasibility of rushing to deal with freezing damage of frozen subgrade.     

催化光度法测定煤中钒

催化光度法测定煤中钒邵谦１葛圣松刘志强贝太伟山东矿业学院济南分院济南２５００３１利用Ｖ（Ⅴ）对溴酸盐氧化还原型罗丹明Ｂ反应的催化作用，文献［１］建立了测定痕量钒的催化荧光法。本文以此反应为指示反应，改测其激发波长下的吸光度，建立了催化光度法测定痕量钒...