The Body Of The Dam And Its Surrounding Geological Seepage And Coupled Stress Analysis

It is the issue for evaluating and predicting the stability of the dam, founationand abutment to investigate the analysis of coupled seepage and stress fields in thedam and its surrounding rock mass. In this dissertation, the systematic researchmethd is utilized, in which rock mass mechanics, seepage theory and structuralmechanics are combined, theoretical anaiysis and engineering application arecombined, and the dam and its surrounding rock mass are combined. The dam and itssurrounding finite rock mass are the main research object. Based on the structure ofthe dam and rock mass, analysis of seepage through the dam and its surrounding rockmass is pefformed. With the hydrotatic seepage pressure and the hydrodynamicseepage pressure (seepage body force or hauling force applied on the fissure walls)being simultaneously considered, the multiple-level fracture network non-linearmathmatical model for coupled seepage and stress (or temperatur) fields in the damand its surrounding rock mass is proposed. The 3-D finite element program andsoftware for solving the couple model is developed. The above couple models andsoftware are applied in the hydroelectric projects such as Xiaowan and LongtanHydropower Station Project. The theories such as hauling force applied on the fissurewalls, the multiple-level fracture network model for coupled seepage and stress (ortemperature) fields, and the numerical method and softwar are newly established inthis dissertation. It can be shown from engineering computation that, by means of thecouple analysis, the total flow rate decreases and the hydraulic head distributionchanges, and the maximum values of stress components increase by 10～20%. Whenthe hydraulic gradient is sharp, the shearing stress increases obviously because of thehauling force applied on the fissure walls. Compared with the couple analysis, thestress values of single analysis is non-conservative. The higher the hydraulicconductivity the more obvious the effect of seepage on temperature, and the lessobvious the effect of tomperature on seepage. When seepage flows from where thetemperature is low to where the temperature is high, the temperature decreases and theWdraulic head increases due to the couple analysis.