initial caving

Study on load transmitting factor of thick sandy soil on key roof stratum during first weighting in shallow seam;

浅埋采场初次来压顶板砂土层载荷传递研究

The first weighting of the main roof is the very fierce ground behaviour.

老顶初次来压是一种十分剧烈的矿山压力显现现象,多数情况下,工作面来压最猛烈、最难控制的是老顶的初次来压。

Combined with the geological conditions,theoritical prediction of first caving distance,first weighting in old roof and circular weighting distance are made,which is coincided with mining practice and effectively supply a guidence for the mining in 88101 face of Kangjiatan mine.

结合康家滩矿 8号煤层 8810 1工作面地质采矿条件 ,进行了直接顶初次垮落步距、老顶初次来压步距和周期来压步距的理论预测 ,与实际开采实践基本吻合 ,有效地指导了康家滩矿首采 8810 1工作面的初采实

Solvent swelling: A new technique for oil primary migration;

溶胀——研究石油初次运移的新途径

Quantitatively evaluating hydrocarbon primary migration by mudstone compaction dynamic analysis;

泥岩压实动态分析法定量评价石油初次运移

With the study on the moving law of the surrounding rocks in the seam mining processing of the fully mechanized coal mining face in 4-2 seam of Fengshuigou Mine,the paper understood the initial pressure and the periodical pressure distance of the 4-2 seam roof pressure,the support strength of the hydraulic supports in the coal mining face,the stress variation and stress a.

综采工作面矿压显现规律对矿山生产实践具有深刻的指导意义,文章通过对石场煤矿4-2煤层综采工作面围岩在煤层开采过程中的移动规律进行研究,掌握了4-2煤层顶板初次来压和周期来压步距、工作面支架支护强度、围岩破坏活动过程煤壁中应力变化大小和应力影响范围。

Technology and control of first roof caving in coal working face;

采煤工作面初次放顶的技术与管理

Practice of first roof caving technology at comprehensive mechanical mining face in steep thick coal seam;

急倾斜特厚煤层综放工作面超段高初次放顶的实践

TO SOLVE THE PROBLEM OF UNEVEN CUT TOBACCO FEEDING IN YJ15 CIGARETTE MAKER, 3 MEASURES WERE TAKEN: 1) ADOPTING AC SERVO SYSTEMS TO DRIVE THE FINE AND COARSE CARDED DRUMS INDEPENDENTLY, TO SHORTEN TRANSMISSION CHAIN; 2) SEPARATING THE FIRST METERING FEED DRIVE FROM THE SECOND ONE; 3) CHANGING GEAR DRIVE INTO TIMING BELT DRIVE.

针对YJ15型卷烟机二次定量供丝存在烟丝供给不均匀的问题,采取了3项改进措施:①采用交流伺服系统独立驱动粗、细钩子辊,缩短传动链;②将初次定量供丝传动与二次定量供丝传动分开;③将齿轮传动改为同步齿型带传动。

Based on simulating model test and theoretical analysis,the mechanism of main roof first breaking is revealed,and the asymmetry breaking parameter is determined.

依据典型浅埋煤层工作面的实测和模拟，发现了采场老顶初次破断的非对称现象。