Deformation Reinforcement Theory And Its Application In High Arch Dam Engineering

For high arch dams, the key problems include monolithic stability evaluation, cracking evaluation of dam-heel, reinforcement design of dam-toe and faults of dam foundation, and the value of mechanics parameter of rock mass. In this dissertation deformation reinforcement theory is improved on the theoretical framework, and then used in the analysis of above problems. The main research works and innovative achievements include:1.The theoretical framework of deformation reinforcement theory is rebuilt according to the general elasto-plastic theory. The clear definition of structural instability is presented. Based on this definition, the strict expression of logic set is built, and then the theoretical foundation of deformation reinforcement theory, minimum plastic complementary energy principle, is deduced and proved. The deduction shows that the minimum plastic complementary energy principle is centralized reflection of equilibrium condition, deformation compatibility condition and constitutive relation.2.The monolithic stability of high arch dams is evaluated using the deformation reinforcement theory. The analytical method of deformation reinforcement theory is to estimate the unbalanced force to maintain the structural stability on the premise of the given monolithic safety factor. Plastic complementary energy is the scalar norm of unbalanced force and its magnitude reflects the distance which the structure deviate from the stability state, so plastic complementary can be used to evaluate the structural monolithic stability. The monolithic stability of high arch dams is evaluated from the angle of overload and reinforcement, K ?ΔE relation curve between overload coefficient K and plastic complementary energyΔE is established and is used to evaluate the monolithic stability of high arch dams.3.Deformation reinforcement theory is used to guide the reinforcement design of dam-toe and faults and to evaluate the cracking of dam-heel. The quantitative calculation of reinforcement force of dam-toe and faults and quantitative evaluation of dam-heel are realized. For the reinforcement of dam-toe, the statistical method of reinforcement force of dam-toe is presented, and the adjusted method of reinforcement force to suitable for the bolting construction is proposed, too. For reinforcement of faults, the scope and direction of unbalanced force of faults are used to guide the design and analysis of reinforcement measure; For the evaluation of dam-heel cracking, the magnitude, distribution scope, and direction of unbalanced force are used to evaluate the possible cracking extend, cracking scope and cracking mode of dam-heel.4.Complementary energy equivalent method is presented and used to determine the strength parameters of complex. By means of expression deduction of complementary energy of complex, the correlation between deformation parameters and strength parameters of complex is shown theoretically. The change law of strength parameters is researched under the different ratio of materials of complex. Numerical computation shows that the complementary energy equivalent method is feasible to determine the strength parameter of complex.