限定顶板条件下矸石充填体横向推实特性试验研究

Experimental study on lateral compaction characteristics of gangue filling body under limited roof conditions

基于相似模拟原理,自主设计了一套模拟试验台,通过对充填矸石散体横向推压,利用推压安息角和体积变化率这2个变形参数,分析研究了放料步距、横向推力、含水量和黄土掺量对充填矸石散体在限定顶板下推实特性的影响规律。试验结果表明,放料步距的增大不利于矸石散体推压后的固结成型;横向推力增大,有助于矸石散体的固结成型,横向推力1.25 k N是推压安息角增大和体积变化率曲线斜率变缓的拐点;含水量对矸石散体推实特性影响较为显著,在横向推力5.0 kN和7.5kN条件下,当含水量达到3%,矸石散体开始固结成型。黄土掺量对矸石散体的推实特性影响最显著,黄土掺量超过4%后,对矸石散体推实特性影响相对减弱。

Based on the principle of similar simulation,a set of simulation test board was designed by laterally pushing on the ganguefilled bulk,using the two deformation parameters of pushing angle and volume change rate,the influence of discharge step distance,pushing force,water content and loss content on the compaction characteristics of the filled gangue under the limited roof conditions was analyzed. The test results show that the increase of discharge step distance is not conducive to the consolidation of gangue;the increase of the lateral thrust contributes o the consolidation formation of the gangue. The inflection point of the slope of the large and volume change rate curve is slow;the water content has a significant effect on the consolidation characteristics of the gangue under laterally pushing. Under the lateral thrust of 5.0 kN and 7.5 kN,when the water content reaches 3%,the gangue starts to consolidate. The amount of loss has the most significant effect on consolidation of granular gangue under lateral pushing. When the amount of loss is more than 4%,the effect on consolidation of granular gangue is relatively weakened.