跨孔电阻率CT技术在立井地面预注浆效果检查中的尝试  

The attempt of cross-hole resistivity CT technique to check the effect of ground pre-grouting in the shaft

作　　者：左永江 陈振国[1,2,3] 李生生 安许良[1,2,3] ZUO Yongjiang;CHEN Zhenguo;LI Shengsheng;AN Xuliang(Beijing China Coal Mine Engineering Com pany Limited,Beijing 100013,China;National Engineering Research Centre of Deep Shaft Construction,Beijing 100013,China;Tiandi Science and Technology Com pany Limited,Beijing 100013,China)

机构地区：[1]北京中煤矿山工程有限公司,北京100013 [2]矿山深井建设技术国家工程研究中心,北京100013 [3]天地科技股份有限公司,北京100013

出　　处：《建井技术》2024年第4期28-34,共7页Mine Construction Technology

基　　金：天地重点自立项目(KJ-2022-JJZD-02)。

摘　　要：立井井筒在遇到含水层或松软破碎岩层时,地面预注浆是常用的堵水加固技术,但对于注浆效果的检查和评价一直没有可靠的手段。物探技术的飞速发展为地面预注浆效果检查带来新的希望。然而,迄今为止国内外尚未有通过物探手段对竖井地面预注浆效果进行检查与评价的报道。通过对物探技术的介绍,分析了常规底面物探技术无法在较深立井地面预注浆效果检查中应用的原因,阐述了超高密度跨孔电阻率CT技术的原理、方法和仪器,并在云南滇中引水工程香炉山引水隧洞新增竖井地面预注浆中进行现场尝试应用。结果表明,超高密度跨孔电阻率CT技术具有分辨率高、多解性低以及全自动、快速采集的特点。通过钻孔深入注浆地层进行测试,相比地面物探方法能更准确地反映地层物性参数变化情况,对较大尺度范围深部地面预注浆效果的定性检查评价是可行的,应进行更多的研究和尝试。When the shaft excavation meets aquifers or soft broken formations,ground pre-grouting is a common water blocking and strengthening technology,but there is no reliable means to check and evaluate the grouting effect.The rapid development of geophysical exploration technology brings new hope for the inspection of ground pregrouting effect.However,up to now,there are no reports of checking and evaluating the effect of ground pre grouting of shaft by means of geophysical exploration.Based on the introduction of geophysical exploration technology,this paper analyzed the reason why the conventional geophysical exploration technology could not be applied in the inspection of the ground pre grouting effect of the deep shaft,and the principle,method and instrument of the ultrahigh density cross hole resistivity CT technology was expounded,and tried to apply it in the ground pre-grouting of the new shaft in the Xianglu Mountain water diversion tunnel of the Y unnan.Dianzhong Diversion Project.The results show that ultrahigh density crosshole resistivity CT technology has the characteristics of high resolution,low ambiguity and automatically rapid data collection.Compared with the ground geophysical exploration method,the test through drilling into the grouting stratum can more accurately reflect the change of the formation physical property param-eters,and the qualitative inspection and evaluation of the deep ground pregrouting effect in a large scale is feasible,and more studies and attempts should be made.

关 键 词：引水隧洞 立井地面预注浆 注浆效果检查 物探技术 跨孔电阻率CT 

分 类 号：P631.322[天文地球—地质矿产勘探]