U型钢可缩性支架的缩动分析

稳定缩动问题是充分发挥Ｕ型钢可缩性支架承载能力的关键。本文给出了Ｕ型钢可缩性支架的缩动条件，讨论了卡缆预紧力对支架抗缩动能力的影响以及支架在缩动过程中抗缩动能力的变化等问题。     

草坪地排供水设施的布置及养护

介绍了草坪排供水设施的布置和养护的方法。     

一种高温矿井用局部供冷装置研究

通过对现有矿井降温技术的分析，研究了一种适合采掘工作面布置特点局部降温装置．该矿用局部供冷装置主要由设有内部换热盘管的储冰车、安装有潜水泵的储水车及空冷器组成．分析了该装置的主要特点及供冷工艺流程，给出了该装置的设计计算依据及相关设计参数；设计确定了储冰箱内换热盘管温降5℃、不同管内水流速下的管程。确定了不同规格矿车、不同管内水流速下的单管程回路根数；确定了不同条件下的储冷量、供冷量及可供冷时间及对应条件下的盘管水阻力；为该局部供冷装置的实施提供了理论依据．图1，表4，参9．     

屯兰矿瓦斯抽放工艺改进的探索

通过对屯兰矿瓦斯赋存及涌出情况分析,论述了各煤层瓦斯抽放工艺改造后的抽放效果,指出综采工作面采用综合抽放在瓦斯治理中的必要性,提出了屯兰矿瓦斯抽放今后发展的方向.     

露天矿机械铲采宽优化问题的研究

本文分析了露天矿机械铲采宽与其效率、采宽与工作线长度、采宽与工作帮坡角以及采宽与霉天矿运输道路长度的关系，并给出了它们之间的关系表达式、绘制出了函数曲线。通过对矿山费用随采宽变化的研究，确定了露天矿最优的采宽值。     

单桩抗拔极限承载力的预测

单桩抗拔极限承载力是抗拔桩基设计中的一个重要参数。基于抗拔单桩静载荷试验数据，采用灰色系统理论法，对单桩抗拔极限承载力进行预测。预测值与实测值比较，结果精度较高，说明该法预测有一定的准确性，能满足工程要求。     

山西煤矿开采排水变化规律初步探讨

通过对山西煤田勘探的经验及煤矿生产实践和近来调查资料的总结分析发现，煤矿开采排水量大小主要取决于地质构造、水文地质条件等自然因素及与矿井开采技术条件有关的人为因素；且不同开采阶段排水量不同，一般规律是初期增长，中期稳定，后期衰减，末期恢复。通过理论分析、对比计算，初步认为煤矿开采后水资源总量是增加，而不通常认为的减少。     

The Effects of Isolation and Acid Mine Drainage on Fish and Macroinvertebrate Communities of Monday Creek, Ohio, USA

Isolated headwater streams in mined watersheds may have good water quality and fish habitat, yet be disconnected from immigration sources by stream segments impaired by acid mine drainage (AMD). Studies of fish and macroinvertebrate communities, habitat, and a number of hydrochemical parameters in Monday Creek, Ohio, show that AMD eliminates fish communities and severely limits macroinvertebrate communities in directly affected tributaries. Isolated headwaters in the heavily mined Monday Creek watershed have relatively good water quality and habitat, but poor fish communities. Comparison of isolated Monday Creek headwaters with non-isolated reaches in unmined watersheds indicates that differences in fish communities are attributable to isolation. Fish communities in isolated headwaters have lower Indices of Biotic Integrity (IBI) than comparable non-isolated communities, reduced species numbers, and lower numbers of individuals, despite suitable habitat as measured by the Qualitative Habitat Evaluation Index (QHEI). Comparison of macroinvertebrate communities shows higher Invertebrate Community Indices (ICI), and no apparent species loss, which can be attributed to the obligate flight stage in the life cycle of many macroinvertebrates, which enables them to overcome aquatic barriers. The implication of this research is that there is an opportunity for recovery of depleted fish communities in large AMD-isolated areas with good water quality, suitable habitat, and intact macroinvertebrate communities, by downstream treatment or source control of AMD to create aquatic corridors for fish immigration.     

钻孔夯扩挤密复合桩地基处理技术

复合桩地基的承载力由桩和桩间土共同分担，旨在充分发挥和利用地基土的承载力潜力，通过串珠状桩体来实现对桩间土的加固和挤密，用多种试验检验方法对复合地基进行全面分析探讨，阐明了钻孔务扩挤密复合桩地基可以有效地解决天然地基承载力不能满足高层建筑物设计要求的问题。     

矿井防治水工作的安全管理

矿井防治水工作是矿区安全生产的重要工作。文中根据矿井自然状况 ,重点阐述了防止水灾所采取的防范措施 ,并收到了良好效果