高密度电阻率法在水库大坝病害检测中的应用及有限元验证OA

This paper takes the large(Type 2)homogeneous earth dam of Daxi Reservoir as the research object.The high-density resistivity method was applied to detect the main dam,obtaining the two-dimensional resistivity distribution characteristics of the dam body and foundation.The interpretation revealed a water-saturated zone in the dam body between station 0+180 and 0+230,and a fault fracture zone at the west abutment.Based on these findings,a finite element model of the dam was established to simulate the evolution of the seepage field under the normal storage level condition before and after reinforcement.The results show that before reinforcement,the hydraulic gradient at the downstream slope overflow point reached 0.68,exceeding the allowable value,indicating a risk of seepage failure.After reinforcement,the concrete anti-seepage wall bears more than 70%of the total head loss;the phreatic line behind the wall is lowered;the hydraulic gradient in the fracture zone decreases from 0.55 to 0.08;the seepage velocity decreases by over 95%;and the seepage discharge per unit width decreases by 98.5%.The combined analytical approach—qualitative diagnosis by high-density resistivity method and quantitative evaluation by finite element method—provides a design basis for the risk elimination and reinforcement of Daxi Reservoir,and can also serve as a reference for defect detection and remediation effectiveness assessment of similar projects.