巷道放顶煤松动高度的确定

巷道放顶煤是急倾斜中厚-厚煤层安全、高效开采的一种新方法.应用模糊数学和灰色理论,建立模型确定顶煤初采松动高度,经试验证明是合理的、可行的.     

急倾斜中厚—厚煤层巷道放顶煤采煤法

针对急性倾斜中厚－厚煤层的力学特性，提出“巷道”放顶煤工艺，在梅田六矿工业性试验成功，取得了单产、工效、回采率高；掘进率、含矸率、材料消耗、劳动强度、生产成本低；实现了全风压通风、安全条件好的效果。为急倾斜中厚－厚煤层的开采找到了一条切实有效的途径。     

急倾斜中厚-厚煤层巷道放顶煤计算机模拟

在工业性试验的基础上建立了急倾斜中厚－厚煤层巷道放顶煤计算机模拟模型，模拟了煤厚、分段高度、放煤口距离对顶煤回收率的影响，确定了不同煤厚的分段高度     

综采放顶煤合理放煤参数的确定

依据椭球体放煤理论,研究了煤层地质赋存条件与放煤参数之间的关系,分析总结了放煤步距、采放比、放煤间距各参数对放出体的影响,从而能够比较合理地确定放煤工艺参数及选用设备;对常用的放煤方式提出了一些有意义的见解,有针对性地为解决实际问题提供理论依据.     

综采放顶煤面沿空巷道合理位置确定

用理论分析了数值计算方法研究了综采放顶煤面沿空巷道的转岩稳定性,分析了影响掘巷位置的几个因素－老顶岩层垮落特征、直接顶和煤体变形特点及采空侧支承压力分丰规律,提出了沿这巷道的合理位置。研究成果应用于兴隆庄煤矿５３１８综采放顶煤面沿空巷道 锚杆支护。并取得了成功。     

急倾斜煤层巷道放顶煤采煤法研究

在梅田矿务局六矿成功地试验了巷道放顶煤采煤法，探讨了顶煤的可放性、放煤巷道的稳定性、全风压通风和提高回收率等关键问题，拓宽了放顶煤采煤法在急倾斜中厚～厚煤层中的应用。     

回采工作面放顶煤数学模型的建立

通过相似模拟实验研究,本文针对煤矿放顶煤回采工作面特点,提出了对放煤效果影响最大的三个主要因素:煤层垮落角(α)、放煤高度(h)及放煤口到煤断线水平距离(l_0)。并发现,在放煤过程中,由于受α、h、l_0值影响,放出体非但不是一个完整椭球体,而且放出体轴线也要发生偏转。在此基础上建立了煤矿放顶煤的数学模型,为放顶煤回采工艺建立了必要的理论基础。     

急倾斜煤层巷道放顶煤开采顶煤可放性评价

应用人工神经网络方法，建立了急倾斜中厚－厚煤层巷道放顶煤开采可放性评价的人工神经网络模型。该模型可用来预测工作面技术经济指标，优化放顶煤工艺参数。     

Technical parameters of drawing and coal-gangue field movements of a fully mechanized large mining height top coal caving working face

Under fully mechanized, large mining height top coal caving conditions, the shield beam slope angle of the support increases due to the enlargement of the top coal breaking and caving space. This results in a change of the caving window location and dimensions and, therefore, the granular coal-gangue movement and flows provide new characteristics during top coal caving. The main inferences we draw are as follows. Firstly, after shifting the supports, the caved top coal layer line and the coal gangue boundary line become steeper and are clearly larger than those under common mining heights. Secondly, during the top coal caving procedure, the speed of the coal-gangue flow increases and at the same drawing interval, the distance between the coal-gangue boundary line and the top beam end is reduced. Thirdly, affected by the drawing ratio, the slope angle of the shield beam and the dimensions of the caving window, it is easy to mix the gangue. A rational drawing interval will cause the coal-gangue boundary line to be slightly behind the down tail boom lower boundary. This rational drawing interval under conditions of large mining heights has been analyzed and determined.     

Fractal analysis of thermal conduction of loose coal

For deep mining engineering,heat transfer of coal mass is a vital factor in the thermal environment of coal mines.In order to study the thermal conduction mechanism,we obtained gray images of coal mass microstructure by scanning samples with a digital microscope.With the use of Matlab,these gray images were transformed into binary images,which were then transformed into a corresponding matrix consisting only of the values 0 and 1.According to the calculation method of box-counting dimension,we calculated the fractal dimension of the loose coal to be approximately 1.86.The thermal conductivity expressions of loose coal were derived based on the simulation method of thermal resistance.We calculated the thermal conductivity of loose coal by using a fractal model and compared the calculated values with our experimental data.The results show that the test data show an encouraging agreement with the calculated values.Hence fractal theory is a feasible method for studying thermal conductivity of loose coal.     

路天煤矿1604工作面采放参数研究

根据椭球体放煤理论对综采放顶煤的合理采放参数进行了研究,并利用数值分析工具MATLAB对研究结果进行了分析,结合神华集团乌海能源有限责任公司路天煤矿1604工作面的煤层赋存情况对其采放参数进行了确定.现场实施结果表明,采放参数合理,其工作面实际回收率达到了88.6%,实现了高产高效开采的目标.     

采空侧综放工作面三角煤失稳机理及控制研究

基于国阳一矿8907综放工作面端头顶板破断特征,建立了采空侧端头三角块结构力学模型,理论及数值模拟分析三角煤失稳机理.结果表明:三角煤区域受本工作面及相邻工作面采动共同影响,应力集中且处于弹塑性区交界处,发生塑性破坏,端头控顶范围增加.不同护巷煤柱尺寸影响采空侧端头围岩应力分布进而影响三角煤的稳定性,将护巷煤柱尺寸由12 m增加至20m能够有效地控制三角煤失稳.在已有的12 m护巷煤柱下,提出采用马丽散注浆加固三角煤及其围岩,据此在81101工作面进行工业性试验,取得了较好效果.     

复杂条件下大倾角对放顶煤冒放规律的影响研究

根据申家庄煤矿2208工作面具体的工程地质条件，理论分析了大倾角对顶煤冒放性的影响，指出大倾角将使工作面上、中、下部产生三种性质不同的力学结构，并通过RFPA有限元软件分别对这三种结构的冒放特征进行了数值模拟，揭示了大倾角煤层顶煤的冒放规律，对该矿优化采煤工艺、提高煤炭采出率有重要指导意义。     

Top coal caving mining technique in thick coal seam beneath the earth dam

It is important to study the mining technology under structures for raising the coal resources recovery ratio. Based on the geological and mining conditions, the top coal caving harmonic mining technique in thick coal seam beneath the earth dam was put forward and studied. The 5 factors such as the panel mining direction, panel size, panel location, panel mining sequence and panel advance velocity were taken into account in this technique. The dam movement and deformation were predicted after the thick coal seam mining and the effects of mining on the dam were studied. By setting up the surveying stations on the dam, the movement and deformation of the dam were observed during mining. By taking some protective measures on the dam, the top coal caving mining technique in thick coal seam beneath the earth dam was carried out successfully. The study demonstrates that harmonic mining in thick coal seam is feasible under the dam. The safety of the earth dam after mining was ensured and the coal resources recovery ratio was improved.     

陈四楼煤矿煤巷锚杆支护研究

结合陈四楼煤矿 2 4 0 1工作面机巷的具体地质条件 ,对煤巷锚杆支护机理进行了研究 .指出在顶板岩石强度较低的情况下 ,采用高强锚杆支护系统 ,并选择合理的锚固方式 ,可以有效地控制围岩变形 ,保持围岩稳定 .主要介绍了回采巷道锚杆支护的设计思路 ,采用数值模拟方法确定锚杆支护参数并在实施过程中对围岩变形进行监测 .工程实践表明 :应用锚杆支护与棚式支护相比 ,能有效改善围岩的稳定性 ,取得了良好的支护效果 .     

软煤层巷道支护数值模拟研究

针对新义煤矿11011工作面回采巷道煤层松软、围岩变形大、现有微拱工字钢支护难以满足生产安全需要的问题,利用FLAC数值模拟软件分别对微拱工字钢和外扎腿U型钢支护下的巷道位移矢量特征、应力特征及塑性区范围进行了分析．结果表明,外扎腿u型钢支护,能有效地改善围岩的应力状态和控制围岩的变形量,适合该矿软煤层特征;通过对12011皮带运输巷进行的工业性试验的实测变形数据分析表明,外扎腿u型钢支护,降低了顶板与两帮收敛速度与位移,提高了软岩巷道围岩强度和自承能力,维护了巷道围岩的稳定性,支护效果良好,能满足新义煤矿安全生产的要求,可为类似条件下的巷道支护提供参考．     

Damage statistical mechanics model of top coal in steep top caving coal

Damage statistical mechanics model of horizontal section height in the top caving was constructed in the paper. The influence factors including supporting pressure, dip angle and characteristic of coal on horizontal section height were analyzed as well. By terms of the practice project analysis, the horizontal section height increases with the increase of dip angle β and thickness of coal seam M. Dip angle of coal seam β has tremendous impact on horizontal section height, while thickness of coal seam M has slight impact. When thickness of coal seam is below 10m, horizontal section height increases sharply. While thickness exceeds 15m, it is not major factor influencing on horizontal section height any long.