It will never be entirely flat because of the shape of the crotch seam, so I designed a bag with an elastic opening at the top so it wouldn't be a problem.
它永远不会完全因为裆缝形状扁平的，所以我设计了一个在顶部弹性打开袋子，以便它不会成为一个问题。
Base on the site observation and experimental research, the paper studied the top coal structure for the top coal caving mining in steep inclined seam sections.
在现场观测及实验研究基础上，对急倾斜水平分段放顶煤开采过程中顶煤体结构进行了研究。
Today during the mining process in contiguous seams, there are many factors leading to hidden danger, such as: the top board being tortured during the exploitation of the lower seam;
目前，我国矿山在极近距煤层开采过程中，下部煤层开采时，顶板遭受损伤，工作面及巷道顶板易于出现冒顶、漏顶现象，严重时造成支架埋压；
First, based on similar material model test, top coal cave-in characters in steep and thick seam were studied as well as failure law of main roof and features of surface subsiding.
首先利用相似模拟实验研究了急斜特厚煤层顶煤的冒落特征、顶板的破坏规律，以及地表下沉的特点。
Through numerical simulation and analysis, the top coal movement and stress distribution in mechanized top caving mining of thick coal seam is revealed.
通过数值模拟分析，提示了厚煤层综放开采时顶煤运移和应力分布规律。
Between skull's bone seam I has two big spot slits in the baby top of the head.
颅骨之间的骨缝在宝宝头顶i有两个大一点的缝隙。
Coalface of Daizhuang Coalmine, the authors believe that the roof in lower seam will form the "block-bulk-beam" structure easy to fall after the mining of top ultra-close seam.
通过对岱庄煤矿4300采区工作面的顶板结构分析，得出了上部极近距离煤层开采后，下部煤层顶板形成极易漏冒的“块体-散体-梁”结构。
The horizontal section top coal caving in steep seam is different from the gently inclined seam.
急斜煤层水平分段放顶煤开采与缓斜煤层不同，工作面沿煤层厚度的水平线布置，长度短。
On the basis of summarizing testing effects, the extension of crack and the breaking mechanism of top coal caving in steep seam have been analyzed by applying fracture mechanics theory.
在总结现场试验效果的基础上，应用断裂力学理论分析了急倾斜煤层巷道放顶煤顶煤破断裂纹的扩展和破碎机理。
The false top is the existence pole exchanges weak caving rock stratum between the coal seam and direct top. In the coal mining, it may often be happened.
伪顶是在煤层与直接顶之间存在的极易垮落的软弱岩层，在井下采煤工作面回采时，会常常遇到。
Aimed at top corner gas management at the low gas blasting face, by upper goaf drainage with decompression in self coal seam, the experience is tried, the effect is obvious.
针对低瓦斯炮采工作面上隅角瓦斯治理，利用本层上采空区泄压释放，进行尝试实验，效果明显。
It was succeeded in practical application. It is an useful exploration for the roadway stability control of fully-mechanized top-coal caving long-wall face in soft and thick coal seam.
并成功进行了实践应用，为进一步完善松软厚煤层长壁综放工作面顺槽稳定性控制理论技术体系进行了有益探索。
The elastic wave reflection method is one of the effective methods of detecting the thickness of the top coal seam.
声波反射法是目前顶煤厚度探测的有效方法之一。
The elastic wave reflection method is one of the effective methods of detecting the thickness of the top coal seam.
声波反射法是目前顶煤厚度探测的有效方法之一。
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