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随着城市轨道交通工程的兴建,盾构施工法被广泛应用并逐步趋于成熟和完善.以某隧道工程施工为背景,介绍了同步注浆技术的应用.根据地层地质条件、地面构建物的情况,就同步注浆原理、目的、工艺、技术参数、浆液配合比及施工注意事项进行了论述,提出了各项质量保证措施. 相似文献
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结合竖向预应力锚杆加固重力式抗滑挡土墙治理滑坡的工程实例,重点阐述了竖向预应力锚杆+抗滑挡土墙构造及其施工工艺流程,指出竖向预应力锚杆+抗滑挡土墙新型结构在基岩山区滑坡治理中的应用前景。 相似文献
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对羊里尾沟金矿床矿体集中分布的北西西向矿带7条勘探线27个钻孔采集了1223件样品,分析了Au等15种元素。元素的参数统计、因子分析结果表明,成矿元素及其指示元素Au、As、Sb、Hg明显富集,并且为中低温热液矿床中常见的低温元素组合。依据元素分带指数计算建立的矿区原生晕叠加轴向(垂直)分带序列为Hg-As-Sb(前缘晕)→Au-W-Zn-Co-Bi(近矿晕)→Cr-Ni-Sn-Mo-Ag-Pb-Cu(尾晕),并发育较强的尾晕与前缘晕叠加,与矿体沿走向和倾向呈尖灭再现的事实吻合。利用元素累乘比值和原生晕异常剖面,预测矿区深部有盲矿体存在。 相似文献
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Methane (CH4) adsorption of Ca2 +-montmorillonite (Mt), kaolinite (Kaol) and illite (Il) at 60 °C and pressures up to 18.0 MPa was investigated, during which the adsorption capacity was evaluated by the Langmuir adsorption model. The influences of adsorbed water and the interlayer distance of the clay minerals on CH4 adsorption were explored by using heated Mt products with different interlayer distances as the adsorbent. Mt, Kaol and Il showed high CH4 adsorption capacities, and their maximum Langmuir adsorption capacities were Mt, 6.01 cm3/g; Kaol, 3.88 cm3/g; and Il, 2.22 cm3/g, respectively. CH4 was adsorbed only on the external surface of Kaol and Il; however, adsorption also occurred in the interlayer space of Mt, which had a larger interlayer distance than the size of a CH4 molecule (0.38 nm). CH4 adsorption in the interlayer space of Mt was supported by the lower CH4 adsorption capacity of heated Mt products (with the interlayer distance < 0.38 nm) than that of Mt at high pressures despite the higher external surface areas of the heated Mt samples. The entrance of CH4 into the interlayer space of Mt occurred at low pressures, and more CH4 molecules entered the interlayer space at high pressures. Moreover, the adsorbed water occupied the adsorption sites of the clay minerals and decreased the CH4 adsorption capacity. These results indicate that clay minerals play a significant role in CH4 adsorption of shale and indicate that the structure and surface properties of clay minerals are the important parameters for estimating the gas storage capacity of shale. 相似文献
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两当县花崖淘金矿谓特低品位金矿床,通过边采边探的方式已生产5年。利用矿石易采易程的特性,进行大规模堆寝生产黄金。通过降低采矿贫化率;进行台理的药品配置,降低生产成率。提高产金效率,取得了良好的经济效益和社会效益,为低品位金矿开发剖出了可行的发展道路。 相似文献
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萤石作为氟化工业产品的主要原料,国内市场量年均增幅约12%。天祝县半阳河萤石矿具有地质结构简单、矿石中Ca F2平均含量高、Ca CO3和P、S等有害元素含量低、矿石易采易选等特点,其开发利用前景良好。 相似文献
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对甘肃某锑矿床矿石组分进行了分析研究,区内矿石主要为原生辉锑矿石,以半自形柱状、粒状结构为主的辉锑矿结晶粒度整体较粗,属易选矿石;少量细针状辉锑矿被石英包裹,颗粒细小,难于解离。通过选矿试验研究,确定采用单一浮选工艺流程:在磨矿细度-200目占50%的条件下,浮选采用一段粗选、三段精选、二段扫选,最终可获得产率3.01%、锑品位48.57%、回收率94.80%的锑精矿,试验结果达到预期指标。 相似文献
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打加错东岩体位于冈底斯—下察隅晚燕山—喜马拉雅期岩浆弧南亚带,侵入岩广泛分布,年龄介于56-65Ma,属于始新世。打加错东岩体具有钙碱性-高钾钙碱性、过铝质,SiO_2含量为65. 49%~70. 32%,K_2O/Na_2O1,碱度率AR数值为2. 02~2. 73,铝饱和指数A/CNK值介于0. 80~1. 08之间,A/NK值介于1. 34~1. 72之间。微量元素整体较为亏损,稀土元素总量总体偏低,显示轻稀土富集、重稀土弱亏损的特征。本文研究认为打加错东始新世侵入岩来源于基性岩部分熔融,同时有部分壳源成份夹物,构造环境为火山弧环境,同时向碰撞环境过渡,具有双重性特点。它们的形成与喜马拉雅时期,雅鲁藏布江洋块继续向北俯冲有关,形成打加错东地区规模最为强烈的岩浆活动。 相似文献