铜坑矿地表塌陷区膏体处置体崩解特性试验研究

发布时间：2018-07-04 10:04

本文选题：采矿工程 + 地表塌陷区　；参考：《岩石力学与工程学报》2017年S1期

【摘要】：利用自制的崩解率测试仪,配合SEM,CT等分析手段研究了废石掺量、水泥添加量对铜坑矿地表塌陷区膏体处置体崩解特性影响规律,探讨了处置体崩解机制。结果表明:在相同水泥添加量时,随废石掺量增加,处置体崩解率减小、崩解时间缩短。在相同废石掺量时,随水泥添加量增加,处置体崩解率大幅降低;将处置体崩解过程划分为吸水崩解、稳定崩解、崩解结束3个阶段;处置体的黏结力源于水泥水化产物形成的强度;处置体内部渗流是在渗透压力作用下,随机分布的开口通道与闭口通道不断扩展的结果;通道扩展的驱动力源于基质吸力,当处置体吸水后,通道中气液相向固相不断传递力值,当力值大于胶结产物的黏结力后,处置体持续崩解。当力值小于黏结力时,处置体不发生崩解。
[Abstract]:The influence of waste rock content and cement content on the disintegrating characteristics of paste disposal in the ground subsidence area of Tongkeng Mine was studied by means of self-made disintegrating rate tester and SEMM-CT. The disintegrating mechanism of the disposal body was also discussed. The results show that with the increase of waste rock content, the disintegrating rate decreases and the disintegration time is shortened at the same cement content. At the same amount of waste rock, the disintegrating rate of the disposal body decreases significantly with the increase of cement content, and the disintegration process of the disposal body is divided into three stages: water absorption disintegration, steady disintegration, and the end of disintegration. The bonding force of the disposal body originates from the strength of the cement hydration product; the seepage in the disposal body is the result of the continuous expansion of the randomly distributed open channel and the closed channel under the action of osmotic pressure; the driving force of the channel expansion is derived from the matrix suction. When the water was absorbed, the gas and liquid phase in the channel continuously transferred to the solid phase, and when the force value was greater than the bonding force of the cementation product, the disposal body continued to disintegrate. When the force value is less than the bonding force, the disposal body does not disintegrate.
【作者单位】：昆明理工大学国土资源工程学院;北京科技大学土木与环境工程学院;
【基金】：中国博士后科学基金资助项目(2016M602722) 国家自然科学基金资助项目(51574013,51374034)~~
【分类号】：TD327

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