Experiment on comprehensive geophysical prospecting in hole in effect inspection of surface pre-grouting in the shaft
DENG Yun
Abstract：There is no reliable method to inspect and evaluate the effect of surface pre-grouting,which is often utilized when the shaft excavation meets aquifers or soft broken formations.No physical pros-pect method can inspect the effect of surface per-grouting in the shaft yet.The combination logging methods and physical parameters,principle of Ultra-high Density Cross-hole Resistivity CT are ex-pounded and the field experiment is carried out to inspect and valuated the result of surface pre-grou-ting in the new shaft in the Xianglu Mountain water diversion tunnel of the Yunnan Dianzhong Diver-sion Project.As a result,resistivity,acoustic velocity are increased and diameter increasing rate is re-duced,which overall reflects the reinforcing and water-sealing effect of grouting.However,the evalu-ation of grouting effect is only qualitative,not quantitative.Combination logging and Ultra High-Den-sity Cross-hole Resistivity CT,can reflect comprehensively the variation of water content characteris-tics and rock integrity from line to profile,which provides a more feasible way to inspect the grouting effect and has a broad application prospect.
Keywords：water diversion tunnelsurface pre-grouting in the shaftinspection of grouting effectcom-bination loggingultra high-density cross-hole resistivity CT
Publication Date：2025-08-10
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 72-77,71 )