黏土固化浆液充填富水岩溶的抗渗性能研究

发布时间：2018-12-18 05:24

【摘要】：为了研究黏土固化浆液充填富水岩溶的抗渗性能,开发了一套室内富水岩溶浆液结石体渗透系数测试装置.通过室内试验,模拟了不同注浆参数和地层排水速度下黏土固化浆液充填富水岩溶的注浆过程,得到了浆液结石体的完整试样,测得了岩溶水养护下试样的渗透系数.试验结果表明:黏土固化浆液具有良好的加固防渗性能,岩溶水养护下28d渗透系数可达1×10-6 cm/s,完全满足富水岩溶充填注浆防渗设计要求;各因素对结石体渗透系数影响程度依次为注浆压力、浆液水固比、地层排水速度,且结石体渗透系数与浆液水固比、地层排水速度呈正相关关系,与注浆压力呈负相关关系.对于实际注浆工程,在地层排水速度一定的情况下,可通过调节注浆压力、优化浆液水固比等方式,来获得较优的结石体抗渗性能.通过电子显微镜扫描进行微观分析可知:微观结构上的差异与宏观结石体渗透系数的变化规律一致,随着注浆压力的增大,颗粒间间距逐渐减小,结石体电镜结构形态依次表现为松散絮状、松散片状、较密实团状及密实板状,结石体密实度进一步提高.
[Abstract]:In order to study the impermeability of water-rich karst filled with clay solidified slurry, a set of laboratory apparatus for measuring the permeability coefficient of water-rich karst slurry stone was developed. Through laboratory tests, the grouting process of filling water-rich karst with clay solidified slurry under different grouting parameters and formation drainage velocity was simulated, and the complete sample of slurry stone was obtained, and the permeability coefficient of the sample under karst water conservation was measured. The experimental results show that the clay solidified slurry has good reinforcement and seepage prevention performance, and the permeability coefficient can reach 1 脳 10 ~ (-6) cm/s, under the karst water curing for 28 days, which can fully meet the requirements of the anti-seepage design for water-rich karst filling grouting. The influencing degree of each factor on the permeability coefficient of stone body is grouting pressure, slurry water / solid ratio, formation drainage speed, and the stone permeability coefficient has a positive correlation with the slurry water solid ratio and the formation drainage velocity, and has a negative correlation with the grouting pressure. For the actual grouting project, the better impermeability of stone can be obtained by adjusting the grouting pressure and optimizing the water / solid ratio of slurry under the condition of certain drainage speed of formation. The microscopic analysis by scanning electron microscope shows that the difference of microstructure is consistent with the change of permeability coefficient of macroscopic stone, and with the increase of grouting pressure, the distance between particles decreases gradually. The electron microscopic structure of the stone is in turn loosely flocculate, loosely flaky, and more compact and plate-shaped, and the density of the stone is further improved.
【作者单位】：中南大学土木工程学院;长沙理工大学水利学院;
【基金】：国家自然科学基金资助项目(51279019) 中国电力投资集团公司重大科技计划资助项目(2011-036-WLDKJ-X) 中央高校基本科研业务费专项资金资助项目(2016zzts075)
【分类号】：U455.49

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