DW型单体液压支柱的大修工艺

老煤矿由于资金紧张 ,外购新柱补充很少。因此 ,现使用的单体液压支柱超期服役的较多 ,急需升井大修 ,以满足各矿采煤工作面的需要。采用校直外圆 ,油缸加衬套的大修方法 ,可满足使用要求。     

中小型液压缸防漏结构工艺

气弹簧后端省去封头，而用缸体直接封口，杜绝了漏气，强化了结构。文章着重介绍了实现这一结构的径向进给封口工具及工艺。     

斜井前置液加砂技术现场应用

中原油田斜井(井斜20°)水力压裂过程中易产生多裂缝和存在严重弯曲摩阻,常出现早期脱砂现象。油、气井压裂后初期产量高,但递减快,稳产时间短(100d),累积产量少。针对这些问题研究了前置液加砂技术,现场应用结果表明,前置液中加入粉砂能有效控制压裂液滤失,降低储层伤害,实现裂缝深穿透,而且粉砂能支撑微裂缝,提高压裂效果;前置液加中砂能有效降低裂缝弯曲摩阻,提高施工成功率。应用该技术,中原油田斜井压裂成功率由初期的50%提高到95%以上,有效率88%,有效期延长了50d以上,应用效果显著。     

新型二合一液压锚定器的研制

作业起泵过程中常常伴随大量原油、污水落地。目前，各大油田使用的投棒式泄油器成功率较低。为了简化作业管柱．提高工作效率．研制了新型锚定器．并通过计算，确定了该锚定器关键部件的技术参数。经过142井次的使用，证明该二合一液压锚定器既能泄油．减少原油、污水污染．又能锚定管柱，提高泵效，减少检泵周期。     

数控母排冲孔机液压系统

介绍了数控母排冲孔机液压系统工作原理及其组成，设计了双泵供油回路、压力控制的差动快进转慢进回路及过载、过热、污染堵塞报警系统。     

二滩电厂双缸液压启闭机原理及故障分析

二滩电厂表孔采用弧形门,启闭形式为双缸液压启闭机.自投入运行以来,运行状况良好.汛期启闭方式已由原来的现地手动操作过渡到远方控制自动启闭.在闸门起落的过程中,由于工况的不同,两缸会出现不同步现象,因此设计中考虑了纠偏回路.本文简单介绍了二滩电厂表孔液压启闭机的原理和故障情况.     

丰城电厂1～4号循环水泵电机线圈温度异常分析及处理

分析了循环水泵电机线圈温度高的原因，提出处理温度高的措施并实施。     

Three-dimensional stability analysis of the dam foundation at Baise

It is usually difficult to determine the actual safety factors of rock masses in an ordinary two-dimensional stability analysis if the safety factors of the different cross sections in the rock mass vary significantly. In addition to the actual slope, arch dam abutment, and the actual foundation of a high building, another example is that the different cross sections of the foundation in the monolith of a gravity dam vary significantly, just like the condition at the overflow dam in the Baise project. A three-dimensional stability analysis method based on the upper-bound theorem was employed to solve this problem. The parameters used in the analysis were obtained from geomechanics tests, as well as continuity simulations of the randomly distributed joints. Two failure patterns against sliding are analyzed. One pattern is the foundation slide along deep-seated planes which were determined by calculations. The other pattern is the foundation slide along the planes across the bottom of the high steps in the foundation pit. The results indicate that a special overflow dam monolith can be considered to be safe in case of considering the three dimensional effect. However, a key wall with a depth of 5m must be constructed at the upper side of this monolith in order to ensure the safety of the foundation. Translated from Chinese Journal of Rock Mechanics and Engineering, 2006, 25(3): 533–538 [译自: 岩土力学与工程学报]     

非饱和土壤水分运动数值模拟研究综述

土壤水是地表水和地下水联系的纽带，在水循环过程中起着重要作用，它和农业、水文、环境等领域有着密切关系。本文从土壤水分运动机理出发，评述了国内外水力参数取值方法和数值模拟的研究动态，对非饱和土壤水分运动数值模拟传统的有限元和有限差分研究方法进行了综合分析，并讨论了两种改进的数值计算方法——有限元质量集中法和有限体积法。本文认为非饱和土壤水分运动的数值模拟虽然取得了一些进展，但对土壤水分运动较为复杂的情况仍然手段有限，该领域的研究工作有待继续深化。