超细水泥浆液最优配比及注浆效果研究
发布时间：2018-12-26 10:35
【摘要】：以九龙煤矿-850 m水平运输(胶带)大巷破碎围岩为研究对象,从注浆效果入手,基于超细水泥浆液水灰比、水泥细度的变化,制作了多批次的标准水泥试块,进行流动性、析水率、密度、单轴抗压强度及注浆等实验,研究了不同水灰比和不同细度下超细水泥浆液的各项力学特性和注浆性能。研究结果表明,在搅拌时间、养护时间和温度等其他因素都相同的条件下,超细水泥浆液的水灰比增大时,析水率随之增大,单轴抗压强度随之减小,流动度总体减小,密度变化很小。当水灰比为1.4∶1、细度为1 250目时,超细水泥浆液的各项力学性能最平衡,注浆效果最好。在进行劈裂注浆实验时,用该配比的超细水泥浆液注浆后的试样在破坏前能够吸收更多能量,表现出明显的塑性特征和抗变形能力。
[Abstract]:Taking the fractured wall rock of -850m horizontal transportation (belt) roadway in Jiulong Coal Mine as the research object, based on the effect of grouting, based on the change of water-cement ratio of superfine cement slurry and the change of cement fineness, a multi-batch standard cement test block was made to carry out fluidity. The mechanical properties and grouting properties of ultrafine cement slurry with different water-cement ratio and different fineness were studied by experiments of water evolution rate density uniaxial compressive strength and grouting. The results show that under the same stirring time, curing time and temperature, when the water-cement ratio of the superfine cement slurry increases, the water evolution rate increases, the uniaxial compressive strength decreases, and the overall fluidity decreases. The density varies very little. When the water-cement ratio is 1.4: 1 and the fineness is 1 250 mesh, the mechanical properties of the superfine cement slurry are most balanced and the grouting effect is the best. In the experiment of splitting grouting, the samples after grouting with the superfine cement slurry of this ratio can absorb more energy before failure, and show obvious plastic characteristics and anti-deformation ability.
【作者单位】： 中国矿业大学(北京)力学与建筑工程学院;中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金面上项目(51274204) 教育部新世纪优秀人才支持计划项目(NCET-12-0965) 国家重大专项项目(2016YFC0600902)
【分类号】：TD265.4
本文编号：2391971
[Abstract]:Taking the fractured wall rock of -850m horizontal transportation (belt) roadway in Jiulong Coal Mine as the research object, based on the effect of grouting, based on the change of water-cement ratio of superfine cement slurry and the change of cement fineness, a multi-batch standard cement test block was made to carry out fluidity. The mechanical properties and grouting properties of ultrafine cement slurry with different water-cement ratio and different fineness were studied by experiments of water evolution rate density uniaxial compressive strength and grouting. The results show that under the same stirring time, curing time and temperature, when the water-cement ratio of the superfine cement slurry increases, the water evolution rate increases, the uniaxial compressive strength decreases, and the overall fluidity decreases. The density varies very little. When the water-cement ratio is 1.4: 1 and the fineness is 1 250 mesh, the mechanical properties of the superfine cement slurry are most balanced and the grouting effect is the best. In the experiment of splitting grouting, the samples after grouting with the superfine cement slurry of this ratio can absorb more energy before failure, and show obvious plastic characteristics and anti-deformation ability.
【作者单位】： 中国矿业大学(北京)力学与建筑工程学院;中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金面上项目(51274204) 教育部新世纪优秀人才支持计划项目(NCET-12-0965) 国家重大专项项目(2016YFC0600902)
【分类号】：TD265.4
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