查询词典 roof caving

The secretary of the Province of New Netherland,(22) writing in Dutch, in 1650, for the information of those who wished to take up land there, states more particularly that those in New Netherland, and especially in New England, who have no means to build farmhouses at first according to their wishes, dig a square pit in the ground, cellar fashion, six or seven feet deep, as long and as broad as they think proper, case the earth inside with wood all round the wall, and line the wood with the bark of trees or something else to prevent the caving in of the earth; floor this cellar with plank, and wainscot it overhead for a ceiling, raise a roof of spars clear up, and cover the spars with bark or green sods, so that they can live dry and warm in these houses with their entire families for two, three, and four years, it being understood that partitions are run through those cellars which are adapted to the size of the family.

一六五0年，新尼特兰州州秘书长用荷兰文写过一段话，更加详细地告诉预备往那里移居的人说，在新尼特兰的人，特别在新英格兰的人，起初是无法按他们的愿望建造农舍的，他们在地上挖个方方的地窖似的、六七英尺深的坑，长短随便他们自己，然后在墙壁上装上木板，挡住泥土，用树皮合缝，以免泥土落下来，当然也有用了别种材料的，还用木板铺了地板，做了天花板，架起了一个斜桁的屋顶，铺上树皮或绿草皮，这样他们全家可以很温暖很干燥地在里面住上两年、三年，或者四年，可以想象，这些地窖中，还隔出了一些小房间，这要看家里的人口数目了。

When the roof overhangs well into the gob and requires induced caving, the chocks can provide access to the gob.

当顶板overhangs早已进入采空区，并要求诱导崩落， chocks可以充分利用采空区。

The fracture angle、height of roof coal and support chute which effect on the rules of caving coal are studied completely.

针对煤矿放顶煤工作面特点，建立了在有边界条件约束下的放出体多元数学模型，全面分析了顶煤垮落角、放煤高度、放煤口位置对放煤基本规律的影响，阐明放出椭球体轴偏角的产生与计算方法。

By using of dynamic fuzzy group method, the top coal cavability was evaluated according to the following seven factors, such as coal seam strength, mining depth, crack developing extent's features, dirt band height, filling situation of goaf, classification of main roof and the ratio of mining and caving height etc.

运用动态模糊聚类方法，以煤层强度、赋存深度、节理裂隙发育程度、夹矸厚度、采空区充满程度、老顶级别、采放比等7个因素按模糊最大隶属度原则综合评价顶煤冒放性。建立了模糊聚分析方法的数学模型，以上述7个指标为基础，对顶煤冒放性的模糊聚类分析进行运算，给出分类的实施过程。潞安矿区顶煤冒放性分类结果表明， 5对主要生产矿井主采3号煤层，其顶煤冒放性皆为好和较好，经潞安矿区综放开采实践证实，分类合理

Based on the theoretical analysis for 1000 m long drainage skills, the UDEC4.0 numerical simulation software is adopted to perform the calculation, showing that the height of caving zone and fractured zone of gob is 9 m and 30 m, the vertical height from the mining induced O-shaped circle to the roof is 10~25 m, and the horizontal distance to both sides of gob is 10~35 m.

本文在顶板千米钻孔抽采技术原理分析的基础上，采用UDEC4.0数值模拟软件计算得出采空区冒落带和裂隙带高度为9m和30m，采动裂隙&O&形圈的范围为距工作面顶板垂高10~25m，距采空区两侧水平距离为10~35m。

The paper introduces roof control methods of goaf of large mining height fully-mechanized face by artificial forced caving with deep-hole blasting at seam 14 of Silaogou Mine and analyzes the effect.

介绍大同煤矿集团公司四老沟矿14#层404盘区8402大采高综采工作面人工强制深孔爆破处理采空区顶板的技术，并对其效果进行了分析。

Through methane simulation experiment on ignition and blasting due to seam roof rock friction in Qinshui Coal Mining District of Yangcheng, it is shown that sparks will be generated through friction while caving ,causing gas and water mixture to fire, it is big hidden sources which cause methane blasting accident in goaf.

通过对阳城沁水矿区煤层顶板岩石相互摩擦引燃引爆瓦斯模拟实验，得出&岩石在冒落过程中相互撞击摩擦产生火花，可能引起瓦斯与空气混合物着火，是造成采空区瓦斯爆炸事故引爆源&的结论。

Such as adaptation to the hard seam roof conditions resistance to a strong frame, adapted to the big mining thick coal seam mining height and caving hydraulic support, adapted to thin seam mining and steep seam mining and other special stent.

如适应于坚硬煤层顶板条件的商阻力强力支架，适应于厚煤层开采的大采高和放顶煤液压支架，适应于薄煤层开采和急倾斜煤层开采的特种支架等。

In the paper,fully-mechanized sub-level caving at home and abroad is systematically summarized,it is presented that how to increase cavability of hard roof coal is main technology difficult problem to be faced.

在国内外综放开采技术系统总结的基础上，提出了特厚坚硬煤层综放开采所面临的主要技术难题就是如何提高坚硬顶煤的冒放性。

After analyzing fully-mechanized sub-level caving technology in the case of special thick and hard coal seam, it is presented that the increment of cavability of hard roof coal and available control of gas are the main difficult technology problem to be faced.

通过对特厚坚硬煤层综放开采技术的系统分析，指出提高坚硬顶煤的冒放性和瓦斯的综合治理是该条件下综放开采所面临的主要技术难题。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。