1) roof movement
顶板运动
1.
Based on numerical results of impacted roof movement at four stages which have been verified in-situ, the damping effects of roof movement at the impacted stage with three-dimensional distinct element code and chaotic dynamics theory are studied.
根据现场验证的冲击性顶板4个阶段运动特征的数值模拟结论,采用三维离散单元法研究冲击阶段顶板运动的阻尼效应,并进行相应的混沌动力学分析。
2.
After investigation of the main factors for roof movement, i.
利用离散元和有限元数值模拟及力学解析计算，分析了放顶煤采场中上覆岩层运动规律；认为采场上覆岩层运动为分层运动，运动结构为拱－梁结构；拱－梁转换的实现，是以拱顶的失稳升高为条件，在分析了影响顶板运动的主要因素（顶板岩层断裂角、放煤步距、顶板岩层块体尺寸、顶煤厚度）的基础上，认为放煤步距过大（≥２ｍ）会降低放煤率，增大老顶垮落的动压冲击程度。
2) movement parameter of roof
顶板运动参数
4) caving coal movement
顶煤运动
1.
According to the field survey at the single?body breaker prop sublevel caving support coal face in Jiulishan coal mine of Jiaozuo,the coal flow state and the drawing ellipsoid?body law during the caving coal movement,crushing and the drawing process at the single?body breaker prop coal face have been obtained.
通过焦作矿务局九里山矿单体支柱放顶煤工作面现场实测， 得出单体支柱放顶煤工作面顶煤运动、破碎、放煤过程中煤流动态及放出椭球体规律， 为确定合理放顶煤工艺参数提供了可靠的依据。
5) Jue Ding" sports
"角顶"运动
6) roof movement
顶板活动
1.
On the basis of characteristics of the roof movement ( from the initial mining phase, the special area to the through phase) and the key parameters of the first and periodic loading distance, Huojitu Colliery has initially grasped the loading regularity of the 2 -2 roof, which provides the scientific gist for roof management in working face.
介绍活鸡兔煤矿首采工作面从初始开采阶段、特殊地段及收尾贯通阶段顶板活动特点和老顶初次来压步距、周期来压步距等主要参数,初步掌握2 -2 煤顶板来压规律,为工作面顶板管理提供科学依据。
补充资料：南美洲运动会和南十字运动会
1922年在巴西举行过1届南美洲运动会,参加者限于南美洲国家。1978年在玻利维亚举行过 1届南十字运动会，参加国有阿根廷、玻利维亚、巴西、智利、厄瓜多尔、巴拉圭、秘鲁和乌拉圭8国。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条