直接顶

顶煤回收率与直接顶厚度关系的PFC数值模拟研究

Research on Relationship of Top-coal Recovery Ratio and Height of Immediate Roof with PFC Numerical Simulation

直接顶的临界高度与支架工作阻力分析

Critical Height of Immediate Roof and Working Resistance of Support

地基容许承载力的理论公式与安全系数分析采场直接顶承载特性研究

Study on Theoretical Formula and Safety Coefficient of Foundation Permitting Bearing Capacity

双筛孔式准直器双开式工作面初放期间直接顶控制

Control of nether roof during primary caving at double open type face

论直接顶岩层初次来压阶段的控制方法

The control method of immediate roof strata during the first weighting stage

直接顶引起的周期压力分析

The analysis of periodical pressure caused by immediate roof

大同直接顶分类研究

A study on the classification of Datong direct roofs

老顶给定变形下直接顶受力变形分析

Mechanical analysis of the immediate roof subjected to given deformation of the main roof

直接顶循环垮落高度对其第一分层稳定性的影响

Influence of Cycle Caved Height of Immediate Roof on Stability of Its First Layer

老顶边界条件下采场矿压显现规律及直接顶破坏模式

Longwall Face Roof Behaviour and Immediate Roof Failure Pattern under Main Roof upper Boundary

∏型钢梁和荆芭在软岩矿区直接顶采煤的应用

Application of Π type steel girder and vitex basketry in immediate roof mining in soft rock mine area

本文依据岩层质量指数，建立了直接顶和老顶的分类准则；

According to stratum quality index , this paper established classification norms of immediate roof and main roof .

仰采、俯采老顶岩层断裂特征及对直接顶稳定性的影响

Fracturing characteristics of main roof strata when mining uphill and downhill and its effect on stability of immediate roof

这种异地煤的直接顶底板是具有风暴沉积特征的浅海碳酸盐岩。

The direct bottom and top beds of this coal are both carbonatite with the chracteristics of storm deposits .

当层向分力与工作面推进方向一致时，直接顶的稳定性较好，反之就差。

When the direction of component and a face advance are the same , the immediate roof is more stable .

特厚煤层综放采场直接顶关键层及支架适应性

Key Layer of Direct Roof and Support Suitability of Fully Mechanized Top Coal Caving Mining Face in Ultra Thick Seam

首次将顶煤的分类与直接顶、老顶的分类结果相结合，弥补了原有顶板分类方案不适合放顶煤采场的不足。

Combine top-coal classification with roof classification for the first time , which make up the inadequate of former classification program .

从上覆岩层运动的角度出发，阐述了顶煤的变形规律，进而运用散体相似模拟试验研究了不同顶煤和直接顶块度对顶煤放出率的影响。

The paper studied the different top coal size and direct roof size influenced to the top coal caving production rate with bulk simulation test .

综采面直接顶滑落冒顶的机理与控制浅析回采工作面局部冒顶事故

Slipping-fall Mechanism and Control of Immediate Roof for Joint Rock Mass in Fully-mechanized Working Faces Talking about the partial top falling accident at extraction face

文中分析了直接顶引起周期压力的原因和条件，提出了预防直接顶周期性压力灾害的措施。

The paper analyzes the reasons and preconditions of this periodical pressure , then preventive measures of hazards caused by immediate roof periodical pressure is suggested .

研究表明急斜放顶煤开采围岩结构虽然与缓斜煤层长壁放顶煤不同，基本顶（老顶）和直接顶只是在工作面的一侧，但仍然不能忽视它对工作面矿山压力显现的影响。

The result of research reveals that strata behavior of basic roof and immediate roof on working face can not be neglected in mining steep seams .

针对一般条件下的采空区，依据直接顶冒落和基本顶沉降的状况，将其划分为3个区域。

Based on the condition of immediate roof falling and main roof settlement , directed toward general condition , the gob is divided into three areas .

理论分析与实践效果表明，简放开采技术应用于软直接顶的松软厚煤层具有良好的适应性。

Theoretical analysis and practical effect show that the technology of drawing top-coal with hydraulic props is well suitable for soft coal seams and soft immediate roofs .

基于能量守恒原理，建立了二次沿空留巷不同阶段直接顶的力学模型，推导出沿空留巷直接顶的稳定性判据。

Based on energy conservation principle , mechanical models of immediate roof in different stage have been established , the stability criterion of immediate roof has been derived .

顶煤的运移与垮落，尤其是内部微观裂隙的扩展，与其直接顶和老顶岩层的活动规律密切相关。

The movement and breakage of top coal , especially its internal micro-fracture extension , are closely related to the movement regularity of its immediate roof and main roof .

根据监测数据分析得出了工作面压力分布规律、直接顶和老顶来压步距和来压前预兆。

According to monitoring data produced pressure distribution patterns , direct top and the old top to pressure to step away from pressure and the former well of the working-face .

通过相似模拟实验和理论分析，研究了综放条件下上位直接顶“散体拱”结构的形成机理和移动演化过程。

Simulation testing and theoretical analysis were made to study generating mechanics and moving evolutionary process of " granular arch " structure of upper immediate roof in top coal caving .

指出采用直接顶推箱梁尾部的方法较其它顶推法有较多的优越性。

At the same time , the author pointed out that adopting the incremental launching method for box beams end part has more advantages than for box beams others part .

研究结果表明，煤柱上支承压力分布是开采影响岩层相互作用的结果，是开采引起集中应力在煤层与直接顶界面上的直接反映。

The results show that the abutment pressure distribution on coal pillar is the direct reflection of abutment stress induced by mining on the interfaces of coal seam and immediate roof .

首先通过对工作面的现场观测，分析得出该工作面直接顶初次来压步距、基本顶初次及周期来压步距和超前支承压力分布范围等矿压显现特征。

Based on the field observation of work , was analyzed first weighting interval of immediate roof , first and periodic weighting interval of basic roof , abutment pressure distribution of roadway .