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| 1 | Coal and gas outburst dynamic system显示文摘Coal and gas outburst is an extremely complex dynamic disaster in coal mine production process which will damage casualties and equipment facilities, and disorder the ventilation system by suddenly ejecting a great amount of coal and gas into roadway or working face. This paper analyzed the interaction among the three essential elements of coal and gas outburst dynamic system. A stress-seepage-damage coupling model was established which can be used to simulate the evolution of the dynamical system, and then the size scale of coal and gas outburst dynamical system was investigated. Results show that the dynamical system is consisted of three essential elements, coal-gas medium(material basis), geology dynamic environment(internal motivation) and mining disturbance(external motivation). On the case of C13 coal seam in Panyi Mine, the dynamical system exists in the range of 8–12 m in front of advancing face. The size scale will be larger where there are large geologic structures. This research plays an important guiding role for developing measures of coal and gas outburst prediction and prevention. | Fan Chaojun Li Sheng Luo Mingkun Du Wenzhang Yang Zhenhua | 2017 | International Journal of Mining Science and Technology2017，27，1： | 19 |
| 2 | 煤与瓦斯突出能量预测模型及其在平煤矿区的应用显示文摘为实现矿区突出能量的预测,从突出腔体周围卸压煤体出发,引入煤体当量半径,理论推导了突出能量预测模型,以平煤矿区为例对其部分矿井突出能量进行了预测,揭示矿区突出能量分布特征,并利用矿区突出点分布及突出强度对预测结果进行了验证.结果表明:平煤矿区突出腔体周围卸压煤体当量半径与抛出煤体当量半径之间呈现出较好的幂指数关系,即R=1.8886r^(0.935 1);单位体积煤体突出能量来源中,弹性能为瓦斯膨胀能的1.0~6.5倍,占总能量的52%~87%,为突出的主要能源;地应力为突出能量预测的关键指标,为控制突出发生的主要因素;矿区突出能量与埋深呈现出较好的正线性相关关系;矿区东南部五矿突出能量较低,西北部八矿、十矿、十二矿突出能量较高.预测结果与矿区实际情况是一致的,证明了预测模型的可行性. | 李成武 付帅 解北京 张明杰 董利辉 王菲茵 薛洪来 | 2018 | 中国矿业大学学报2018，47，2： | 16 |
| 3 | Permeability and pressure distribution characteristics of the roadway surrounding rock in the damaged zone of an excavation显示文摘Research on the permeability and pressure distribution characteristics of the roadway surrounding rock in the excavation damaged zone(EDZ) is beneficial for the development of gas control technology. In this study, analytical solutions of stress and strain of the roadway surrounding rock were obtained, in which the creep deformation and strain softening were considered. Using the MTS815 rock mechanics testing system and a gas permeability testing system, permeability tests were conducted in the complete stress-strain process, and the evolution characteristics of permeability and strain were studied over the whole loading process. Based on the analytical solutions of stress and strain and the governing equation of gas seepage flow, this paper proposes a hydro-mechanical(HM) model, which considers three different zones around the roadway. Then the gas flow process in the roadway surrounding rock in three different zones was simulated according to the engineering geological conditions, thus obtaining the permeability and pressure distribution characteristics of the roadway surrounding rock in three different zones. These results show that the surrounding rock around the roadway can be divided into four regions-the full flow zone(FFZ), flow-shielding zone(FSZ), transitive flow zone(TFZ), and in-situ rock flow zone(IRFZ). These results could provide theoretical guidance for the improvement of gas extraction and gas control technology. | Xue Yi Gao Feng Liu Xingguang Liang Xin | 2017 | International Journal of Mining Science and Technology2017，27，2： | 5 |
| 4 | 煤层注水渗透率模型及水力耦合影响因素数值模拟研究显示文摘为有效防治矿山动力灾害,优选煤层注水技术合理参数,以东于煤矿03303工作面为实验背景,基于多孔介质渗流理论,通过高压水侵渗流实验系统获取不同覆压条件下渗透率演化拟合曲线。结合流固耦合渗流模型、渗透率拟合曲线和比奥模量等多种参数,构建动态渗透率计算模型,对煤层注水卸压增透过程及其影响因素进行数值模拟,根据模拟结果优选注水工艺参数开展现场实验,对比分析数值模拟结果和现场实测数据。研究结果表明:煤层注水可有效卸载地应力,提高低渗煤层渗透性,随着注水时间的增加,增透区域以注水钻孔为中心向径向方向均匀扩展,注水钻孔间会产生水力复合影响区域,降低注水增透效果,注水压力、钻孔孔径和钻孔间距均不同程度影响水力耦合区域;在相同注水时间下,选用0.2 m孔径及5 m钻孔间距,在8 MPa水压下煤层注水卸压增透效果较好。 | 刘震 王文迪 许文彪 杨赫 董博文 | 2021 | 采矿与安全工程学报2021，38，6： | 3 |
| 5 | 煤与瓦斯突出多因素影响规律与能量判据实验研究显示文摘为分析煤与瓦斯突出多因素耦合影响规律,开展了多组不同条件下含瓦斯煤快速揭露致突模拟试验.将模拟试验结果与突出能量模型相结合,计算突出潜能与突出耗能的定量关系,分析得出突出临界瓦斯压力与煤体强度呈正相关,与轴向应力呈负相关,验证了能量判据对突出激发的必要性.选取煤体弹性能、瓦斯膨胀能、煤体强度及密度等参数建立了两个综合考虑多影响因素的无量纲参数,进而拟合得出发生剧烈突出的能量判据公式.结果表明:瓦斯压力及轴向应力越大,煤体强度越小,突出危险性越高;各因素对煤与瓦斯突出危险性的影响重要程度排序为:瓦斯压力>煤体强度>轴向应力. | 王伟 王汉鹏 张冰 徐飞 | 2022 | 东北大学学报(自然科学版)2022，43，4： | 3 |
| 6 | Coal and gas outburst prevention using new high water content cement slurry for injection into the coal seam显示文摘As coal and gas outburst is one of the most serious mine disasters, it is very important to at least control it if not prevent it from occurring. Injecting cement slurry or grouting into the coal seam can strengthen the seam, increase its rigidity coefficient(f), and reduce the volumetric expansion due to gas energy release.This paper reports the results of laboratory experiments on cement-based high water content slurry having different water-cement ratios(W/C) to be used for coal injection. The results show that as the W/C increases, the mobility of the slurry and its setting time increase. The compressive strength and rupture strength, however, are reduced. Furthermore, high W/C grout shows early strength after 7 days, which can be 80% of its 14-day compressive strength. To achieve rapid setting and early strength, the addition of Na_2SiO_3has proven to give the best result, when the concentration of the additive is 3%. The initial and final setting times are 13 and 21 min shorter than samples without Na_2SiO_3, while the compressive strength is more than double. As a retarder, the initial setting time can be extended to 83 min when tartaric acid of 0.4% concentration is added. Through the orthogonal experiment, the optimum recipe of the new high water content slurry has been determined to be: W/C = 2, tartaric acid = 0.2%, Na_2SiO_3= 3%, and12% bentonite. Reinforcement by injection simulation experiments show that the grouting radius of the new slurry mix is 250 mm when the applied grouting pressure is 60 k Pa, 7-day rupture strength and compressive strength are 5.2 and 6.4 MPa, respectively, and are 37% and 88% higher than ordinary cement grout. It can be concluded that the newly developed slurry mix is more effective than the ordinary mix for reinforcing coal and controlling gas outburst. | Zhou Peiling Zhang Yinghua Huang Zhi'an Gao Yukun Wang Hui Luo Qiang | 2017 | International Journal of Mining Science and Technology2017，27，4： | 3 |
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