Mouska金矿充填体内部应力分布及强度设计研究
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摘要
为实现全尾砂膏体充填体强度设计的双重目标，即在保障安全生产的前提下，实现降低充填成本、提高矿山生产效益的经济目标，本文结合Mouska金矿的实际生产条件及全尾砂膏体充填工艺，在其全尾砂膏体充填材料特性分析与测试的基础上，确立了膏体充填材料水化模型及力学参数随水化反应的演化模型，并从膏体充填体与围岩的相互作用关系入手，分析了Mouska金矿全尾砂膏体充填体在采空区的实际力学作用，建立了Mouska金矿全尾砂膏体充填体三维力学模型。通过对Mouska金矿7-1WS采空区充填体内部应力的实测，分析了膏体充填体内部应力分布的一般规律，并通过对比充填体内部应力实测值与力学模型预测值，验证了Mouska金矿全尾砂膏体充填体三维力学模型的有效性。应用Mouska金矿膏体充填体力学模型对其强度进行设计，通过对比常用充填体强度设计方案，验证了力学模型强度设计方法可以实现充填体强度设计的双重目标。
In order to achieve the double design targets of tailings paste backfill including the safety ofunderground mining production and decreasing the cost of backfill to increase the economic profitfor mines, the paper conducts a series of research based on the in-situ production condition and thetailings paste backfill technology used in Mouska gold mine. The research first establishes thepredicting model of binder hydration based on the analysis and measurement of mechanicalproperties for the materials of tailings paste backfill. Meanwhile, the paper also constructs theempirical evolutive models for the UCS and cohesion of tailings paste materials. In order todetermine the key role of mechanical action for tailings paste backfill in stope, the relationshipbetween paste backfill mass and surrounding rock is analysed. Most importantly, the paperproposes a3D mechanical model to predict the internal stress distribution in tailings paste backfill.To validate the3D model, the in-situ stress of tailings paste backfill is measured in7-1WS stope ofMouska gold Mine. Through the comparison of measured values and predicted values of internalstress for backfill mass, the regularities of stress distribution are obtained and the3D mechanicalmodel is verified. The mechanical model is employed to design the strength of tailings pastebackfill. It has been proved that the strength design strategy of mechanical model is effective andcan achieve the double design targets through the comparison with three other common usedstrength design methods of tailings paste backfill.
In order to achieve the double design targets of tailings paste backfill including the safety ofunderground mining production and decreasing the cost of backfill to increase the economic profitfor mines, the paper conducts a series of research based on the in-situ production condition and thetailings paste backfill technology used in Mouska gold mine. The research first establishes thepredicting model of binder hydration based on the analysis and measurement of mechanicalproperties for the materials of tailings paste backfill. Meanwhile, the paper also constructs theempirical evolutive models for the UCS and cohesion of tailings paste materials. In order todetermine the key role of mechanical action for tailings paste backfill in stope, the relationshipbetween paste backfill mass and surrounding rock is analysed. Most importantly, the paperproposes a3D mechanical model to predict the internal stress distribution in tailings paste backfill.To validate the3D model, the in-situ stress of tailings paste backfill is measured in7-1WS stope ofMouska gold Mine. Through the comparison of measured values and predicted values of internalstress for backfill mass, the regularities of stress distribution are obtained and the3D mechanicalmodel is verified. The mechanical model is employed to design the strength of tailings pastebackfill. It has been proved that the strength design strategy of mechanical model is effective andcan achieve the double design targets through the comparison with three other common usedstrength design methods of tailings paste backfill.
引文
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