黏土固化浆液充填富水岩溶的抗渗性能研究

Experimental study on the anti-permeability of clay hardening grouts filling in water-rich karst

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.

In order to study the permeability resistance of clay solidified slurry to fill the water rich karst,a set of test equipment for the permeability coefficient of the water rich karst stone body was developed.Through the indoor experiment,the process of different grouting parameters and grouting stratum under the condition of drainage clay solidified grout filling karst was simulated,to get a complete sample grout,coefficient of permeability with karst water curing specimen.The test results show that the clay cement slurry has good performance of anti-seepage reinforcement,karst water conservation 28 dpermeability coefficient can reach 1×10^-6 cm/s,fully meet the water rich karst filling grouting design requirements.Various factors on the influence of the penetration coefficient of stone body followed by grouting pressure,slurry water solid ratio,strata drainage conditions,and stones permeability coefficient and slurry water solid ratio,positive correlation between strata drainage conditions,and negatively related to the grouting pressure.For the actual grouting engineering,under certain conditions of formation drainage conditions,by adjusting the grouting pressure,optimizing the ratio of slurry and other means,a better stone body anti permeability performance can be ob-tained.It can be seen from the micro analysis by scanning electron microscope that,consistent with the variation of permeability coefficient between micro structure and macro stone body,with the increase of grouting pressure,inter particle spacing decreases gradually.The structure forms of stone body electron microscope are in order of loose flocculent and loose flakes,more dense clusters and dense plate.The compactness of the stone body is further improved.