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- Minimum safe mining depth 最小安全开采深度
- Characters of overburden strata movement of mines and safe mining depth 矿山覆岩移动特征与安全开采深度
- Please tell me the minimum safe oxygen percentage for the safety of the workers in an enclosed space. 请说出进入封闭舱室需要的安全氧气含量。
- With the increase of mining depth,the possibility for rock burst increases correspondently.It has become a major factor which endangers the safe operation of coal mines. 随着煤矿开采深度的增加,冲击地压危险越来越大,已成为严重威胁矿井安全生产的主要灾害。
- Spontaneous combustion of sulfide ores is one of the major hazards in safe mining of sulfurous ore deposits. 硫化矿石自燃的防治一直是含硫矿床面对的主要安全问题。
- The upward horizontal cut and fill stoping method and the measures for safe mining are recommended. 推荐使用机械化上向水平分层充填采矿法，提出了安全回采措施。
- With the increase of mining depth, the problem of floor heave of roadway could become more and more serious. 摘要随着开采深度的不断增加，巷道底鼓问题日趋严重。
- With the increase of mining depth,the possibility for rock burst increases correspondently. 随着煤矿开采深度的增加,冲击地压危险越来越大,已成为严重威胁矿井安全生产的主要灾害。
- This study provides a scientific method about studying the gas content of the coal seam unmined and provides the basic data about the safe mining. 这为未开采煤层瓦斯含量的研究提供了科学方法，并为该煤矿的安全开采提供了基础资料。
- All this provide the theory reference for safe mining of the island coalpillar, establish theory base, and have certain instruction function. 这都为孤岛煤柱的安全开采提供了理论参考,奠定了理论基础,并且有一定的指导作用。
- The analytical solution of roadway discharge is given,under the condition of rock permeabillty attenuation with mining depth increase. 给出了在岩石渗透性随深度衰减条件下，二维稳定流巷道涌水量的解析解。
- Rock-bursting is a special underground pressure behavior in deep mining in China currently and it intimidates seriously the safe mining. 冲击矿压是当前我国煤矿深部开采出现的一种特殊的矿山压力现象,它严重威胁井下安全生产。
- In Xuzhou Coal Mining Area the groundwater hazard is serious due to the larger mining depth and complicated hydrogeological conditions. 徐州矿区开采深度大，水文地质条件复杂，水害严重。主要突出水源为奥陶系含水层。
- MSAW Minimum Safe Altitude Warning 最低安全高度警告
- The coordinates of the centre point of a subsidence trough are calculated by the effect transference angle and the mining depth. 利用平面图形几何重心公式计算回采工作面水平投影图形的重心坐标，然后根据影响传播角和开采深度计算下沉盆地中心位置的坐标。
- The analysis stresses on the critical techniqes to be studied and problems ,(?) solved in determining and applying the safe mining plans, approaches and measures. 文中着重分析了在选定和实施有关技术途径、方案和措施时,应当重视研究、解决的一些技术关键。
- Alongside mining depth of mine continuing,roadway support displays out soft rocks feature,anchor way of bolt must expand from end bolt to long bolt and all bolt. 随着矿井采深的不断加大,巷道支护表现出软岩支护的特点,锚杆锚固方式由端锚逐步向加长锚、全锚方向发展。
- An initial mining depth in the thick seam or a depth of a full seam cut will cause an obvious increasing in crack height and also in horseshoe distribution. 增大重复开采厚度以提高采煤工效和矿井经济效益;
- As mining depth of the stope area and geopressure increase,stope wall rock and obsturator are of the possibility of serious yielding destruction and whole instability. 随着开采深度的增加,采场面积扩展和地压增大,采场围岩及充填体潜在着严重的屈服破坏和整体失稳的可能。
- With mining depth increasing continuously in our country,in condition of mining in the deep-lying,there are many problems in determining displacement angle of stratum at present. 随着我国煤矿开采深度的不断增加,指出了目前岩层移动角的确定存在诸多问题。
