The hard-and-thick strata acts both as the floor of coal seam No.
张双楼煤矿主采煤层为7煤和9煤,两层煤之间赋存唯一一层厚硬岩层,即9煤层的直接顶也是7煤层的直接底。
Intenerating technique of top coal in fully mechanized top coal caving hard thick coal seam;
硬厚煤层综放开采顶煤弱化技术研究
Research on the Deformation Rule of Surface Movement Caused by Mining under the Conditions of Thick Alluvium and Hard Solid Rock;
厚松散层厚硬岩层开采地表移动变形规律研究
2. In flat dip layer, the seam thickness control the stability of the wall rock, the thick-bedded hard rock is stable than the thin-bedded hard rock.
② 岩层厚度在缓倾斜时对围岩稳定起控制作用，厚层硬岩整体稳定性好于薄层状硬岩。
Research on the Minimum Rock Cover Thickness of Underwater Tunnel in Alternating Layers of Hard and Soft Rocks;
软硬岩交互地层水下隧道最小岩石覆盖层厚度研究
ANALYSIS OF CUT ROCK SLOPE FAILURE MODES WITH THICK SOFT-HARD INTER-BEDDINGS IN FULING COUNTY,CHONGQING
重庆市涪陵区厚层软硬相间岩体失稳模式
Technology of Safety and High Efficiency Mining Face under Extremely Hard and Thick Igneous Roof
特硬厚层火成岩顶板工作面安全高效开采技术
Under the circumstances, gypsum or anhydrite could accumulate to form beds many meters thick, without any co-precipitation of halite.
在这种环境下，石膏或硬石膏可以堆积成许多米厚的岩层，而没有任何石盐伴生沉淀。
Rapid Construction Technology for Auxiliary Shaft in Super-thick Hard Rock in Babao Mine
八宝煤矿副井超厚硬岩快速施工技术
The Influence of Rock Layer Thickness on the Instability of Rock Bedded Slopes
岩层厚度对顺层岩质边坡失稳机理的影响
Comparison of strata movement between section and slicing of top coal mining in steep and thick seams
急斜厚煤层分层与分段放顶煤岩层移动对比
A metamorphic rock, intermediate between shale and slate, that does not possess true slaty cleavage.
厚层泥岩一种变质岩，在页岩与板岩之间，不具备真正的板块解理
Study on Reasonable Width of Coal and Rock Pillar under Thick Aquiferous Loose Bed;
厚含水松散层下煤岩柱合理留设研究
Research of Methods of Tapping Potential Oil in Thick Sandstone Layers of Da Wangzhuang Oilfield
大王庄油田砂岩厚油层挖潜对策研究
Experiment and Research on Deep Borehole Blasting in Mine Rock Roadway with Thick Soft and Weak Parting
厚软弱夹层岩巷中深孔爆破试验研究
STUDY ON FRACTURE MECHANISM OF OVERLYING SUPER-THICK ROCK STRATUM IN UNDERGROUND MINING
地下开采上覆巨厚岩层断裂机制研究
These folded rocks are composed of medium to thick bedded limestone of Ordovician and of thin bedded shale and siltstone of Silurian.
这些褶皱岩层是由奥陶系的中层至厚层石灰岩以及志留系的薄层页岩和粉砂岩组成。
Study on the Failure of Overlying Rock in Mining Shallow Thick Coal Seam by Slicing Method;
浅埋厚煤层分层开采覆岩破坏规律研究
Study on Failure Law of Surrounding Rock and Overlying Bed in Steep and Specially Thick Coal Seam Mining;
急斜特厚煤层开采围岩与覆盖层破坏规律研究
Study on the Law of Movement and Failure of Overlying Rock in Shallow Seam Mining under Thick Clay Layers;
地表厚土层浅埋煤层覆岩运动与破坏规律研究