碎石充填注浆法回采底柱试验研究

【作者】 邱宇；

【导师】 熊正明；

【作者基本信息】 江西理工大学 ， 采矿工程， 2011， 硕士

【摘要】 矿产资源的充分高效利用是资源可持续发展的一个目标,残留矿柱作为矿产资源的一部分,它的充分回收体现了资源可持续发展这一目标要求。顶底柱的回采是残留矿柱回采的一个难点,受到赋存环境、回采工艺方法的制约。本文从充填工艺和混凝土力学角度出发,采用注浆方法在阶段矿柱之上形成具有强度和整体性的人工假顶,以达到安全充分回采矿柱的目的。本文主要从以下几个方面进行了研究:(1)以注浆在岩土工程中的应用为背景,以渗透注浆理论为基础研究影响碎石注浆效果的因素。着重分析注浆材料、注浆方法、浆液与碎石松散集料的作用机理。(2)设计完成了室内注浆模型试验装置,为现场注浆提供了试验依据。(3)采用注浆室内模拟试验对碎石松散集料可注性进行研究。采用静压力底部注浆的方式,从单孔注浆到多孔注浆进行模拟,从试验上验证其注浆造顶方法的可行性。(4)浇注与注浆碎石胶结体相同配合比的试件,以及作为对比的不同配合比试件,通过抗压强度试验和声波测试来检测碎石胶结体的注浆效果。进一步得到该配合比条件下注浆碎石假顶的稳定性。(5)在注浆试验的基础上,采用数值模拟的方法对底柱回采注浆假顶的稳定性进行分析。结合尖点突变和强度折减法,以位移突变作为注浆假顶失稳的主要判据,得到注浆假顶安全系数。更多还原

【Abstract】 Making use of mineral resources fully and efficiently is on of the goals of sustainable development.As part of mineral resources,the full recovery of residual pillar demonstrates this objective of resources sustainable development.It’s a difficulty to recover the top pillars and bottom pillars,for it conditioned by existing environment and stoping method.From the point of view of filling technology and concrete mechanics,formed strengthen and integrity artificial roof on the top of stage pillar by grouting in this article,and achieved the purpose of stoping pillars fully and safety.The following aspects were studied in the article:(1) Settled application of grouting in geotechnical engineering as the background,the effect factors of stone grouting were studied based on the permeation grouting theory.Mechanism actions of grouting materials,grouting methods,slurry and discrete aggregate were analyzed.(2) Completed the design of interior grouting model test device,and provided the experiment basis for on-site grouting.(3) The filling character of discrete aggregate was studied by interior grouting simulation test,the feasibility of forming the roof by grouting was verified in the way of static pressure bottom grouting,which was simulated from haplopore to multiaperture grouting.(4) Casted specimen that with the same mixture ratio with gravel cementation,and made contrastive specimen with different mixture ratio.The effect of grouting gravel cementation was tested by the compressive strength test and sonic wave test.Further obtained the stability grouting false roof under that mixture ratio in the.(5) The stability of grouting false roof in the process of stopping the bottom pillars was analyzed by numerical simulation based on grouting test.Safety factor of grouting false roof was obtained,According to the displacement mutation and associated with cusp catastrophe.更多还原