1) span
垮落步距
1.
Based on the plastic mechanics theory we have obtained the formulae and the equations for determining the first span,the secend span and the stable span,and given some examples.
应用塑性力学理论推出确定初次垮落步距、二次垮落步距和稳定垮落步距的公式和方程。
2) the pace of top coal collapsing initially
顶煤初次垮落步距
1.
Through observing the practical mine pressure of Changgou mine's working face,including the pace of top coal collapsing initially,the pace of direct roof rock collapsing initially,the pace of basic top pressing initially and its intensity,and the pace of the basic top pressing periodically and its intensity,the paper has researched the rule of stope's mine pressure.
对长沟煤矿工作面进行了实际矿压观测,包括顶煤初次垮落步距、直接顶岩层初次垮落步距、基本顶初次来压步距及其来压强度、基本顶周期来压步距及其来压强度,分析研究了采场矿压规律。
3) the pace of direct top collapsing initially
直接顶初次垮落步距
4) collapse
垮落
1.
The failure,rupture and collapse of mining induced surrounding strata are a representative process in which the boundaries of dynamic system are variable.
煤矿采动围岩的破坏、断裂和垮落是具有代表性的时变边界过程。
5) collapse instability
垮落失稳
1.
Comprehensive assessment of collapse instability of fractured rockmass mediums based on in-situ monitoring;
基于现场监测的破碎围岩介质垮落失稳及综合分析
6) roof caving
顶板垮落
1.
Using this model,we have simulated the roof caving characteristic and the stress distribution of surrounding rocks and analyzed the deformation feature of the surrounding rocks in the working face end.
02D数值模拟软件建立相应的分析模型,模拟了煤层开采过程中的顶板垮落和围岩应力分布特征,重点分析了工作面上下端头的围岩应力分布规律及变形特点;结合具体生产矿井的综采工作面现场情况,得出了综采工作面推进过程中的周期来压、采动影响范围和煤壁片帮等矿压显现特征,并针对开采中出现的问题提出了相应的安全防范措施。
参考词条
补充资料：松垮垮
1.散漫;涣散。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。