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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。
The self-made disintegration rate tester was used to analyze the influence of the content of waste rock and the amount of cement on the disintegration characteristics of the paste disposal body in the surface subsidence area of Tongkeng Mine by SEM and CT analysis methods. The disintegration mechanism of disposal body . The results showed that with the same amount of cement added, the disintegration rate of the treated body decreased and the disintegration time shortened as the content of waste rock increased. At the same dosage of waste rock, the disintegration rate of the treated body decreased significantly with the increase of the amount of cement added. The disintegration process of the treated body was divided into three stages: water absorption disintegration, stable disintegration and disintegration, and the bonding strength The strength of cement hydration products formed; Percolation within the disposal body is the result of the continuous expansion of the open channels and closed channels randomly distributed under the osmotic pressure; the driving force for channel expansion originates from the suction of the matrix; when the treated body absorbs water, The gas-liquid phase in the channel continuously transmits the force value to the solid phase, and when the force value is greater than the adhesive force of the cemented product, the disintegrating body continues to disintegrate. When the force value is less than the adhesive force, the disintegration of the body does not occur.