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- Under gassy coal seam condition, the full-heading development is employed.Because of the fast heading a high rate of gas emission arises. 在瓦斯含量较大的煤层采用综掘掘进巷道,由于掘进速度快,出现了瓦斯涌出量过大的现象。
- coal seam conditions 煤层条件
- Attempt to revolved cave in the high inclined fully mechanized mining face with the "three soft" coal seam condition "三软"煤层条件下综采大角度旋转开采的尝试
- Complex coal seam roof and floor conditions made stope support system low stiffness,poor stability and a very adverse the exploitation environment. 复杂的煤层顶底板条件使得采场支护系统刚度低、稳定性差,开采环境十分恶劣。
- The severe inclined thick coal seam,being its special geological storage conditions,is weakly extracted and the recovery rate is comparatively low. 急倾斜特厚煤层因其特殊的地质赋存条件,导致开采强度小,资源回收率低。
- Coal miners; coal seams; coal haulers. 煤矿工; 煤层; 运煤工
- From the characteristic of prop and actual conditions of coal seam and roof in Datai pithead, the support force of the dense prop in 揝ichuan Method?is calculated. 从单体液压支柱的特性出发,结合大台井实际的煤层和顶板条件,计算了俯伪斜走向分段密集采煤法密集柱的支撑力。
- Coal seams intermixed with iron ore. 煤层和铁矿混杂在一起。
- The Gaussian curvature of No.3 coal seam in Qinshui basin is calculated. 计算了沁水盆地3号煤层的高斯曲率。
- Factors affected coal seam permeability change and its law is analyzed. 分析了煤层透气性变化的影响因素及变化规律。
- The outburst-proneness of 6# coal seam are studied with five indexes. 采用5种指标对该矿6%23煤层冲击倾向性进行了实验研究。
- Because of faults and ground water H_2S gas of the coal seam of the east side of the dike is escaped in late stage,while the west side takes on H_2S abnormity because of well capping conditions. 岩墙东侧因断层和地下水的作用;煤层中H2S气体后期遭逸散;西侧因封盖条件较好而呈现出H2S气体异常.
- Because of faults and ground water H2S gas of the coal seam of the east side of the dike is escaped in late stage, while the west side takes on H2S abnormity because of well capping conditions. 岩墙东侧因断层和地下水的作用,煤层中H2S气体后期遭逸散,西侧因封盖条件较好而呈现出H2S气体异常通。
- Coal seams intermixed with iron ore . 煤层和铁矿混杂在一起。
- The comprehensive research showed that coalbed methane accumulation is mainly controlled by coal seam thickness,coal petrological composition,coal rank,adsorbability and good preservation conditions. 综合研究表明:该区煤层气富集的控制因素主要为煤层厚度、煤岩组分、煤级、吸附性能和良好的保存条件。
- The way and principle of Gaussian curvature method for forecasting natural fracture zones in coal seam are discussed. 摘要论述了高斯曲率法预测煤层天然裂隙发育区的基本原理和方法。
- Outburst prevention technique of excavating in coal seam will be directly concerned colliery safety production and excavates taking over. 摘要突出煤层煤巷掘进防突直接关系到煤矿的安全生产和采掘接替。
- Long- wall double working- face combined winning technical practice in faull lager small section coal seam. 断层带小块段煤层走向长壁双工作面联合开采技术实践。
- Research on coal bedding structure is the theory foundation and precondition of coal seam gas exploitation. 煤体层理结构的研究是煤层气开发开采的理论基础和前提条件。
- So it is feasible used the logging data to forecast coal seam gas content,and the applied value is enhance further. 证明用测井资料预测煤层瓦斯含量是可行的,从而进一步加强了测井资料的实际应用价值。