钻孔取芯与高密度电法的溶洞注浆检测方法研究  

Research on Testing Method for Grouting Effect in Karst Caves Based on Drilling Coring and High-Density Electrical Method

作　　者：王冉 昝子卉 Wang Ran;Zan Zihui(Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,P.R.China)

机构地区：[1]广州地铁设计研究院股份有限公司,广州510010

出　　处：《地下空间与工程学报》2024年第6期2054-2063,共10页Chinese Journal of Underground Space and Engineering

摘　　要：为研究溶洞注浆处理效果的检测评价方法,本文对某工程的岩溶注浆处理区段进行了现场钻孔取芯检测和高密度电法室内模型试验研究。首先,通过钻孔取芯对该处理区段内的溶洞注浆效果进行了检测分析,发现该区段溶洞注浆处理效果较为良好;然后,结合数字化建模和3D打印实现了溶洞模型的构建,为岩溶室内模型试验提供了参考;最后,通过室内模型试验深入研究了溶洞在不同浆液填充度条件下,基于高密度电法的岩溶注浆效果检测评价方法。结果表明:注浆后溶洞位置处的视电阻率值会较注浆前存在一定幅度的下降,高阻异常区域面积会缩小;随着溶洞注浆量的增加,溶洞注浆处视电阻率图像达到稳定的时间相应延长,通常当溶洞被水泥浆液完全填充时,视电阻率图像将会在注浆后7 d达到稳定。研究对优化岩溶注浆效果检测评价方法提供了一定的参考。To study the detection and evaluation methods for the effectiveness of karst cave grouting treatment,this article conducted on-site drilling core detection and high-density electrical method indoor model test research on the karst grouting treatment section of a certain project.This article first tested and analyzed the grouting effect of the karst cave in the treatment section through drilling and coring,and found that the grouting treatment effect of the karst cave in the section was relatively good;Then,combining digital modeling and 3D printing,the construction of a karst cave model was achieved,providing a reference for indoor karst model experiments;Finally,based on the evaluation method of high-density electrical method for detecting the effectiveness of karst grouting under different slurry filling conditions was deeply studied through indoor model experiments.The results indicate that the apparent resistivity value at the location of the karst cave after grouting will decrease to a certain extent compared to before grouting,and the area of high resistivity anomaly will decrease;As the amount of grouting in the karst cave increases,the time for the apparent resistivity image to reach stability at the grouting site of the karst cave is correspondingly prolonged.Usually,when the karst cave is completely filled with cement slurry,the apparent resistivity image will reach stability 7 days after grouting.This study provides a certain reference for optimizing the detection and evaluation methods of karst grouting effectiveness.

关 键 词：城市轨道交通 溶洞注浆 钻孔取芯法 高密度电法 注浆效果 

分 类 号：TU413[建筑科学—岩土工程]