Optimum Thickness of Covering Layer in Sublevel Caving Stopping

The arching effect of tunnel is closely related to the thickness of covering layer.

隧道的成拱效应与覆盖厚度的大小有着密切关系。

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The trend analysis of coal thickness shows its distribution regularity on a whole mine field scale, whereas the orientational gradient and variation coefficient in a gliding window are the new parameters used to demonstrate quantitatively the thickness variation of coal seam.

趋势面分析揭示了井田尺度煤厚变化的主体特征；方向梯度和滑动窗口变异系数分析是对煤厚变异性定量描述的一种新参数。

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Within the north structure block, with the influence of the thin seam thickness, the thickness of the structure coal seam was relevantly thin.

在北部构造区内受煤层厚度较薄的影响，构造煤厚度相对较薄。

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Because of crustal movement and the river flushing action, the primary structure of the coal seam destroyed, that is thickness and structure of the coal seam changed.

煤形成后，由于地壳运动与河流的冲刷作用，煤层的原生结构遭到破坏，即煤层的厚度、结构发生变化，由于岩浆的侵蚀作用，局部煤层变质为天然焦。

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The other is mining technical conditions including mining method, the ratio of depth and thickness, obliquity of coal seam, size of mining dummy and mining speed and so on.

第二类为开采技术条件，主要包括开采太原理工大学硕士研究生学位论文方法、深厚比、煤层埋藏倾角、采空区尺寸、工作面推进速度等。

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Analysis on Changeable Law and Influential Factors of Thickness of ⅱ_1 Coal seam in Songshan Mine Field

嵩山井田二1煤层厚度变化规律及其影响因素分析

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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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It is tried that the instantaneous amplitude, instantaneous phase and instantaneous frequency of seismic information are used for calculating the thickness of the coal seam based on the seismic attribution of various rock formations and the developed characteristics of the coal seam in this area.

根据不同岩层的地震属性及本区煤层发育特点，尝试了利用地震瞬时振幅、瞬时相位和瞬时频率信息计算煤层厚度。

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In this system, the neural network nonlinear inversion method is used to interpret thickness variation of coal seam. This method defines the nonlinear relationship of both coal thickness and seismic attribute parameters quantitatively and has high interpretation precision.

该系统采用人工神经网络非线性反演方法对煤层厚度变化进行解释，对煤层厚度和地震属性参数之间的非线性关系给出了定量描述，具有较高的解释精度。

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The size of the support force of the dense prop increases with the increase of thickness of the coal seam, the roof press is borne mainly by the dense prop.

密集柱支撑力的大小随煤层厚度增加而增大，顶板压力主要由密集柱承担；

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The processing results of the actual detecting signals indicate that the ability to identify the weak reflected wave is considerably improved and the accuracy to detect the thickness of the coal seam is increased.

结果表明：小波多尺度分析大大改善了煤层顶板弱反射波的识别能力，提高了煤厚探测的精度。

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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。

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The structural deformation is the principal geological factor that affects the thickness variation of coal seam on a mine field scale. Study of the distribution of No.

构造作用是控制井田范围内煤层厚度变化的主要地质因素.超化井田二1煤层厚度变化规律研究表明，中生代以来三期挤压应力场作用导致煤层厚度展布的分带性和方向性；

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To identify the signal of the weak reflected wave is a key problem to detect the thickness of the coal seam by using elastic wave.

弱反射波信号识别是声波法煤层厚度探测中的一个关键问题。

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From Hales method, reversed refracted wave method shows accuracy and efficiency in detecting the thickness of remained coal seam.

以哈尔斯法为例，将相遇折射波法用于剩余煤厚探测中，具有精确、高效、快速的特点。

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So, the detecting signals of thickness of the coal seam are processed by means of the wavelet multi-resolution analysis.

针对这一问题，对顶煤厚度探测信号进行了小波多分辨分析；

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Application of reversed refracted wave method in detecting the thickness of remained coal seam

相遇折射波法在剩余煤厚探测中的应用

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The coalbed methane ( CBM) geologic condition in Daning-Jixian region is very complex, it reveals into three aspects as follows: ① The thickness of coal seam of shan'xi formation is changeable, and there exist obviously thinning or thinning out.

大宁&吉县地区的煤层气地质条件复杂，主要表现在3个方面：①山西组煤层厚度变化大，有明显的尖灭变薄现象；

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The running load of AFC in a fully mechanized face changes with such factors as, dip angle and thickness of coal seam, length of face, spalling of rib, especially haulage speed and position of shearer at face in coal cutting.

综采面输送机的运行负荷是随着煤层倾角、煤层厚度、工作面长度、煤壁片帮情况、特别是采煤机割煤时的牵引速度以及采煤机在工作面的工作位置的不同而变化。

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It is pointed out that main factors of water inrush of face are fracture developing degree and watery of sandstone aquifer, thickness of coal seam, fault and aquifuge thickness between the 4th coal seam and aquifer etc..

指出了砂岩含水层的裂隙发育程度和富水性强弱、煤层的厚度、断层的作用以及4煤与含水层之间隔水层厚度的大小等，是影响工作面涌水的主要因素。

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