抗200℃高温水泥浆体系的研制

随着钻探深度的不断加深,井底温度越来越高,由于中国生产的水泥外加剂很难满足实际需求,只能从国外引进,很大程度地增加了超深井完井成本.因此通过研究合成工艺,研制出了抗温能力在200 ℃以上的抗高温缓凝剂、降失水剂和稳定剂,并进而开发出了抗高温水泥浆体系.水泥浆常规性能评价和井下工况模拟评价结果表明,该体系在高温环境下具有性能稳定、稠化时间可调、控制失水能力强、沉降稳定性好、抗压强度高、适应性强、一次封固能力高等特性,能够满足井底循环温度达200℃的超深井固井需求.     

某铁矿挂帮矿开采对地表拦洪坝的影响

由于挂帮矿位于某铁矿东区拦洪坝水库附近,地表不允许塌陷,需要保证地表拦洪坝的安全,因此采用嗣后充填采矿方法对其进行开采。通过有限差分法对其进行数值模拟,在挂帮矿一号矿体、二号矿体、三号矿体不同开采情况下,分析地表的变形以及拦洪坝附近监测点的沉降情况。模拟结果表明,在开采拦洪坝下方的挂帮矿三号矿体时,地表变形范围增大,拦洪坝附近监测点沉降值急剧增加,可能会使裂隙进一步扩大,甚至威胁到拦洪坝的安全,诱发泥石流等地质灾害,建议拦洪坝附近禁止一切开采活动,挂帮矿二号矿体开采应严格按照开采设计要求进行。     

The effects of observation and gender on psychogenic symptoms.

Objective: To assess the effects of modeling and its interaction with gender in the production of psychogenic symptoms. Design: Healthy volunteers were asked to inhale an inert substance described as a suspected environmental toxin that had been reported to provoke 4 physical symptoms. Subsequently, half of the participants observed a confederate inhale and display the 4 expected symptoms. To control for the general tendency of women to report more physical symptoms than men, participants were also asked to rate the presence of 4 unexpected symptoms. Main Outcome Measures: Symptom ratings at 10-min intervals over a 1-hr period. Results: With unexpected symptoms controlled, observation of symptom displays increased reports of expected symptoms significantly. In addition, the presence of another person of the same gender as the participant increased the production of expected symptoms, even when symptoms were not modeled by the confederate. There was also a trend for women to show more expected symptoms than men. Conclusion: Although the effect of modeling was independent of gender, the mere presence of a same-gender individual, as opposed to a person of the opposite gender, increased reports of expected symptoms, regardless of whether the second person (i.e., the confederate) displayed symptoms. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Daytime observation technology of a lidar using an atomic filter

Based on the dual-wavelength high altitude detecting lidar we developed, daytime observation capability was realized in its sodium fluorescence channel by employing a Na (sodium) atomic filter and other relevant technologies. Because of the very narrow passband and very high out-of-band suppression of the Na atomic filter, the lidar echo at an 80-110 km altitude can be obtained even at noontime when background light from the sun is very strong. The capability for a 24-h continuous observation of the lidar system has been demonstrated by the preliminary observation result. This development makes the constant detection and investigation of high altitude atmosphere over the country possible.     

Characteristics of roadbed settlement in embankment-bridge transition section along the Qinghai-Tibet Railway in permafrost regions

The Qinghai-Tibet Railway (QTR) project was finished on July 1, 2006, and has served for over 3 years. Judging from the present situation, the roadbed is stable and train speed in permafrost regions achieves 100 km/h as expected during the designing. However, as half part of the roadbed was constructed over the permafrost characterized by high ground temperature and high ice content, slight changes of the permafrost might lead to roadbed problems, of which the settlement in embankment-bridge transition section is an obvious and special one. Investigated results of 164 bridges and accounting to 656 positions from the Xidatan Basin to the Chiqu Valley along the QTR in 2009 showed that the settlement was influenced by factors including bridge orientation, embankment slope direction, embankment height, ground temperature, ground ice content of permafrost and local subgrade soil type. For the average value of the settlement, it was greater at the northern end of a bridge than that at the southern end, and was greater in sunny-slope than that in shady-slope. It was greater in high ice permafrost regions than that in low ice regions, and was greater in high-temperature permafrost regions than that in low-temperature regions. Additionally, it increased logarithmically with the height of the embankment. In regions where the subgrade soils were dominated by silt, silty clay or fine sand, the settlement amount was higher than that in bedrock regions. Correlation analysis results showed that there were good relationships between the settlement and the slope direction, embankment height, ground temperature and ice contents when some of the later items were quantified. The correlation coefficients were 0.234, 0.213, −0.21 and 0.151 respectively, when the factors were quantified.     

沿空巷道失稳分析与控制技术试验研究

通过对阳煤集团三矿沿空巷道及其隔离煤柱的矿压观测结果分析,得出巷道发生破坏变形的主要原因;确定采用缩小K8104与K8106工作面之间煤柱尺寸的方法控制矿压显现,工业性试验的矿压观测数据表明,试验巷道在掘进和回采期间基本保持稳定,提高了煤炭采出率和经济效益。     

巷道构造震波超前探测技术及其应用

矿井震波超前探测(Mine Seismic Prediction,MSP)技术基于反射地震勘探原理,采用巷道多次覆盖观测系统采集地震数据,综合运用了波场矢量合成与分解、横向偏移叠加等处理技术.在实践应用中表明MSP技术是一项可以有效地对掘进巷道前方150 m范围内断层等地质异常进行长距离超前探测的实用技术.     

采矿巷道围岩变形机理的初步研究

使用收敛观测法监测了某铁矿采区水平巷道开挖后围岩位移变化情况,并对采区水平巷道建立有限元模型,模拟巷道开挖后围岩应力、应变状况,通过巷道变形监测及数值模拟结果的对比验证了围岩变形机理的结果.     

复合坚硬顶板综放工作面顶煤顶板运移研究

通过现场实测研究了新阳煤矿复合坚硬顶板条件下综放工作面顶煤和顶板的运移规律。研究表明,在未处理坚硬顶板和夹矸的条件下,9#顶煤和直接顶板也能及时冒落,有利于提高顶煤采出率。     

潜孔锤跟管钻进技术在小浪底水利观测孔工程的应用

在黄河小浪底水利枢纽观测孔工程中。采用气动潜孔锤跟管钻进结合双动力头钻机成功地解决了普通气动潜孔锤及常规钻进工艺在厚度达50m渣石层成孔难的问题。