roof caving

In Fully Mechanized Caving, the motion of the cover roof and its rock pressure phenomenon is comparatively violent for the greatly thickness extracted of coal seam in one time.

综放开采法一次采出厚度大，工作面顶板运动及其矿压显现也相对剧烈。

The Technology Study of Roof Coal Presplitting in Thick Seam Caving Coal Mining

厚煤层放顶煤开采顶煤预裂技术研究

Simultaneously, the gas control in roof caving and fully mechanized mining is the unsubstantial aspect of prevention measures for gas disasters in all over the world.

同时，放顶煤综采工作面的瓦斯治理也是世界各国煤矿瓦斯灾害防治技术的薄弱环节。

Roof caving is one of the most serious engineering disasters in underground mining activities of metal mines. It not only delays the progress of production, but also threats against underground workers.

顶板垮落是金属矿山地下开采中严重的工程灾害之一，它不仅影响采矿进度，同时也对井下作业人员生命安全构成威胁。

Dedusting mechanism by water-cloud of wetting agents and the relevant tests for fully-mechanized and roof caving coal face Don't put the unit in extremely hot or moist place.

综放工作面湿润剂喷雾降尘机理及高效降尘湿润剂的试验不要把话机故意放到温度高的或潮湿的地方。

Mining disasters such as sliding, subsidence and roof caving are the results of mutation of complex systematic behaviors. Their formation mechanism, spatiotemporal evolvement law and mutual relation are very complex.

滑坡、塌陷与冒顶等矿山灾害是复杂地质系统行为突变的结果，其形成机制、时空演变规律及相互间的关系都十分复杂。

Technology and control of first roof caving in coal working face

采煤工作面初次放顶的技术与管理

Cause Analysis on Askew of Light Roof Caving Support

轻型放顶煤支架歪架原因分析

A Caving Blast Test with a Detonating Fuse over the Tough Roof of a Group of Steep Coal Seams

急倾斜煤层群坚硬顶板导爆索爆破放顶试验

With the roof caving in, there were an increasing number of desertions.

由于大势已去, 逃兵的人数日益增多.

The fracture of overlying key stratum results in decrease of the roof caving angle and the increase of periodic caving span and weighting intensity.

覆岩关键层的破断使工作面顶板垮落角减小、周期垮落步距和来压强度都增大。

The design of light-duty roof caving coal hydraulic support equipped with flat tramcar

轻型放顶煤液压支架配套平板车设计

Analyses factors that affect cover caving ability of roof coal in sublevel caving mining method.

分析了放顶煤开采顶煤冒放性的影响因素.

The caving of thick and strong roof stratum, key stratum, causes tremendous rock pressure in mine.

采场上覆岩层中的厚硬岩层, 即厚硬关键层, 其冒落会造成剧烈的矿山压力显现.

Practices on fully mechanized caving technology in thick seam with hard roof

坚硬顶板较厚煤层综采放顶煤工艺的实践

Analysis of Complex Roof Caving Process in Mining by Caving Method

崩落法开采时复杂顶板的崩落过程分析