有机硅材料改性砂岩强度与ζ电位变化规律

发布时间：2018-06-22 01:35

本文选题：砂岩 + 单轴抗压强度　；参考：《岩土力学》2014年11期

【摘要】：针对干湿循环作用下岩石强度劣化引发工程岩体稳定性控制问题,以山西忻州保德煤矿8煤顶板中粒长石石英砂岩为例,对砂岩进行有机硅材料改性试验。通过单轴压缩试验研究改性前、后砂岩经历不同干湿循环作用后的强度损伤劣化规律,采用电泳法对比分析改性前、后砂岩表面ζ电位变化规律,并探讨了有机硅材料改性砂岩的改性机制。结果表明,(1)改性后砂岩的单轴抗压强度、弹性模量和变形模量明显提高,单轴抗压强度提高21.7%,弹性模量提高22.2%,变形模量提高23%;(2)受干湿循环作用砂岩强度劣化效应明显,随干湿循环次数增多,砂岩单轴抗压强度、弹性模量和变形模量均呈负指数关系降低;(3)有机硅材料对砂岩表面的电性有较大影响,随着岩样悬浮液p H值的降低,砂岩表面的负电性逐渐减弱至不带电,最后变为正电。
[Abstract]:In order to control the stability of engineering rock mass caused by the deterioration of rock strength under the action of dry and wet cycles, the modification test of organosilicon material on sandstone was carried out with the example of quartz sandstone with feldspar in the roof of No. 8 coal mine in Xinzhou Baode Coal Mine, Shanxi Province. Through uniaxial compression test, the strength damage deterioration law of sandstone before and after modification was studied, and the change law of Zeta potential on sandstone surface before and after modification was analyzed by electrophoretic method. The modification mechanism of organosilicon modified sandstone was discussed. The results show that: (1) the uniaxial compressive strength, elastic modulus and deformation modulus of the modified sandstone are obviously increased, the uniaxial compressive strength is increased by 21.7, the elastic modulus is increased by 22.2, and the deformation modulus is increased by 23. With the increase of dry and wet cycles, the uniaxial compressive strength, elastic modulus and deformation modulus of sandstone decrease exponentially. (3) Organosilicon material has great influence on the electrical properties of sandstone surface, and with the decrease of pH value of rock suspension, The negative charge of sandstone surface gradually decreases to no charge, and finally becomes positive.
【作者单位】：太原理工大学采矿工艺研究所;
【基金】：国家自然科学基金(No.51004075,No.50974093) 中国博士后科学基金(No.20110491631) 山西省青年科技研究基金(No.2011021024-2) 山西省高校优秀青年学术带头人计划项目(2012年)
【分类号】：TU452

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