中关铁矿深孔注浆幕墙井间电阻率测试技术和效果评价

Effect Evaluation and Cross-well Resistivity Technology for the Deep-hole Curtain Grouting in the Zhongguan Fe Mine

矿山治水中所采用的帷幕注浆工法具有典型的隐蔽工程特点,因此,注浆效果的评价一直是该领域内的一个难题。中关铁矿深孔帷幕注浆工程利用井间电阻率测试技术对注浆效果进行了深入的研究,验证了该物探手段在帷幕注浆工程中应用的可行性和先进性。井间电阻率反演图清楚地表明:注浆前后地层电阻率由低到高的变化过程,说明止水达到了良好的效果;本文还结合注浆工程资料,系统地分析了注浆过程中钻孔单位注灰量及岩层透水率的变化过程,为井间电阻率测试技术的试验结果和帷幕墙止水效果的检验评价提供了旁证支持。

Curtain grouting have typical characteristics of concealed engineering.It is a difficult problem for grouting effect evaluation.Using cross-well resistivity technology,the grouting effect of the Zhongguang mine was studied.Meanwhile advancement and feasibility of cross-well resistivity technology were proved.Inversion picture of cross-well resistivity shows pre-and post grouting for formation,the resistivity changed from low to high,curtain grouting got better results.Combined geophysical result with grouting engineering data,the changes of the unit amount of plaster injection and rock permeable rate were analysied.The results provided support for the test of cross-well resistivity and effect evaluation of water stop curtain grouting.