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- Keywords hard roof;hydrobreakage;tensile stress;RQD index; 坚硬顶板;水力压裂;拉应力;RQD指数;
- Keywords hard roof;rational coalface length;rock plate;rupture regularity; 坚硬顶板;合理工作面长度;岩板模型;破断规律;
- Keywords hard roof;soft coal;solt bottom;large inclination;caving in front of supports; 坚硬顶板;软煤;软底;大倾角;架前冒落;
- In mining, if the hard roof is submitted to shear failure, the sidesteps might sink or even collapse. 摘要综放面开采过程中，坚硬顶板超前剪切破坏，会造成工作面台阶下沉，甚至工作面整体垮落。
- The movement of hard roof in manless working face extraction has been simulated with three dimensional distinct element code for dividing into four stages. 分4个阶段模拟了无人工作面开采坚硬顶板采场顶板的运动规律。
- Through changing the face support fashion,the hard roof is managed by cutter top supports to increased cutter top resistance in Qitaihe Tiexi Coal Mine. 七台河铁西煤矿通过改变工作面支护方式,使用切顶支架增大切顶阻力来管理坚硬顶板,使坚硬顶板得到了较好的控制,杜绝了顶板事故的发生。
- Hard-top convertibles have become increasingly popular because they offer the top-down fun of a convertible with the quietness and security of a hard roof when the top is up. 硬顶敞篷车开始越来越流行，因为他具备了敞篷车的乐趣和全顶车的安全。
- In view of the compound hard roof of Six picks the area,through carrying on the comprehensive servation and the mechanics analysis appeared to pressure appears of the working face production process. 针对复合型坚硬顶板的六采区,通过对工作面生产过程的矿压显现进行了全面观测和力学分析。
- The longwall may relax some safety problems, but the other safety problems such as hard roof rock, the colliding and friction of the caved rock each other may be induced or intensified . 但是也可能诱发一些安全问题,如坚硬顶板对支架的冲击、采空区垮落岩石的撞击与摩擦诱发瓦斯事故等。
- The hardness and thickness of coal seam play a great role in the vertical distribution of stress in coal and the occurrence of rock bunt under the condition of hard roof and hard floor. 在“两硬”条件下，煤层厚度与硬度的变化对煤体中的应力分布有着很大的影响，从而对煤岩体系统中冲击矿压的发生有着很大的影响。
- Keywords hard wire;transversal crack;cold-drawing; 硬线钢丝;横向裂纹;拉拔;
- Keywords hard alloy;carborundum;WC;sintering phase; 硬质合金;金刚砂;碳化钨;烧结相;
- Keywords Deep thick hard roof;Rock bursf;Stress fold;Coal barrier;Fracturing destabilization; 深部厚坚硬顶板;冲击地压;应力叠加;煤柱;断裂失稳;
- Keywords hard zine;vacuum distillating riching Ge;IN; 硬锌;真空蒸馏;富集;锗;铟;
- Central caving method in full-mechanized face under hard roof 坚硬顶板条件下综采工作面中部放顶的方法
- Keywords hard twist thread;pyrocondensation;fancy yarn; 纱线结构;点纹织物;
- Controlling Design of Working Face with Thick and Hard Roof 厚层坚硬顶板采场控制设计
- Keywords Hard Pitch;Polystyrene;Impact Strength;Tenside Property ; 硬沥青;改性聚苯乙烯冲击强度;拉伸性能;
- Analysis on site measurement of coal pillar with hard roof 坚硬顶板煤柱稳定性实测分析
- Keywords hard metal hermetization;valve;grind;servo;adjustment; 硬密封;阀门;磨削;伺服跟踪;调整;
