风积沙似膏体煤矿充填材料的研究及应用
Series No．478April一2016一一一一一一一一一一一一一一一金一一属一一矿一一山METAL MINE 一一一一一一一一一一一一一一一一总第478期2016年第4期
收稿日期一2016-01-14
作者简介一孙凯华(1982 ),男,副研究员三四综合利用四
风积沙似膏体煤矿充填材料的研究及应用
孙凯华1,2一刘鹏亮1,2一孙万明1,2一祝一琨1,2
(1.天地科技股份有限公司,北京100013;2.煤炭科学研究总院开采设计研究分院,北京100013)
摘一要一为在我国西北矿区实现充填材料的本地化,考察了当地广泛存在的风积沙作为充填骨料对充填体性能
的影响三实验室试验结果表明:随着风积沙掺量的增加,充填体强度和结实率变化不明显,充填材料成本逐渐降低;随着辅料掺量的增加,充填体的7d 强度变化不明显,28d 强度和结实率均逐渐提高,充填体密度逐渐降低,充填辅料可以为充填材料提供碱性环境二减少泌水和充填体干缩,从而保证充填体的接顶率;随着料浆浓度的提高,料浆表观黏度和剪切应力均逐渐提高三工业试验显示,在w (水泥)?w (辅料)?w (粉煤灰)?w (风积沙)=1?1．6?10?12,料浆浓度为70%时,充填体工作面14d 内平均强度迅速增长至4．35MPa,充填体的长期强度稳定在5MPa 以上,近水平煤层条件下充填率达到98．5%,强度发展和后期强度的稳定性都能满足支撑上覆岩层的压力的需要三钙矾石在充填体中呈针状二柱状结晶结构相互交错,形成致密的网络结构,可以促进充填体早期强度迅速提高;大量水化产物在粉煤灰颗粒表面堆积包裹,连同其他絮凝状胶凝将风积沙颗粒等胶结包裹成整体二致密的网络结构,可以使充填体强度保持长期稳定三试验结果对解决充填材料需求与供应不均衡二采煤效益与充填成本不均衡等问题具有重要意义三关键词一风积沙一似膏体充填材料一工业应用一一中图分类号一TD80一一一文献标志码一A一一一文章编号一1001-1250(2016)-04-172-05Research and Application on Aeolian Sand Paste-like Stowing Material for Mine
Sun Kaihua 1,2一Liu Pengliang 1,2一Sun Wanming 1,2一Zhu Kun 1,2
(1.Tiandi Science and Technology Company Ltd.,Beijing 100013;2.Mining and Design Research Branch ,China Coal Research Institute ,Beijing 100013)Abstract 一In order to use aeolian sand as stowing material in Northwest area and localize the stowing material for mine,effect of aeolian sand as filling aggregate on stowing materials was studied.The experimental results indicate:With the increase in dosage of aeolian sand,the strength and the stone rate has no obvious change for the stowing materials,the cost of stowing materials has been reduced;with the increase in dosage of auxiliary gelatinization material,the 7d strength has no obvious change for the stowing materials,the 28d strength and stone rate of material increased gradually,the density of material de-creased gradually;the apparent viscosity and shear stress gradually raised with the increase of the concentration for the slurry;the auxiliary materials provide appropriate conditions of alkalinity and temperature for stowing slurry,exudation water is signifi-cantly reduced and the hardening rate of stowing body is obviously increased.The industrialtests indicated that,with w (ce-ment)?w (accessoriesl)?w (fly ash)?w (aeolian sand)=1?1．6?10?12,slurry concentration is 70%,the average sto-wing body increased to 4．35MPa in 14days and long-term strength above 5MPa for stowing mine working face;the filling rate achieved 98．5%with horizontal coal seam,the stability of strength can meet the need of the pressure from overlying stra-ta.Ettringite form a dense network structure in stowing body,it can promote the early strength of the stowing body increased rapidly,numerous hydration products and flocculent gel cemented and wrapped the aeolian sand particles into the overall dense network structure,that ensure long-term strength stable for stowing body.The experiment results of aeolian sand paste-like sto-wing material not only solved the imbalance of supply between demand of stowing materials but also the imbalance of stowing
cost and mining benefit．Keywords 一Aeolian sand,Paste-like stowing material,Industry application
一一对我国煤炭工业发展而言,要实现资源开发和矿
区环境保护的协调发展,必须加强充填开采技术的研
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