| The foundation settlement deformation of drainage sluice has a significant influence on the safety of construction and operation for drainage sluice,Studying on the variation law of sluice settlement and its failure mechanism has a significant directive function for design construction and safe operation.In this paper,the problem of settlement deformation and failure mechanism of the Tuojiang downstream dam is studied.Taking the Tuojiang downstream dam as the research object,through theoretical and experimental research,exploring the feasibility and correctness of the Duncan-Chang parameters through the soil e-p curves and the values of c and φ,to provide the required calculation parameters for numerical calculations.Takeing the Tuojiang downstream dam as an example.The settlement deformation law of Tuojiang sluice foundation under different working conditions is studied by using the finite difference method of 3-D elastoplastic analysis,the main controlling factors of settlement deformation are revealed.The main research results are as follows:1.The soil e-p curve,compression coefficient and compression modulus of Tuojiang foundation were measured by standard consolidation test.The cohesion and the angle of internal friction of foundation were measured by direct shear test,and the parameters of Duncan-Chang of foundation soil were measured by conventional triaxial compression test.2.According to the e-p curve and shear strength parameters obtained by the experiment,t he Duncan-Chang parameters of the soil are derived by the Duncan-Chang parameter simplifi ed analysis method,and compared with the measured valuesof the corresponding triaxial com pression test.The relevant error is minor,indicating the use of the Duncan-Chang parameter simplification analysis method is reasonable and feasible to derive Duncan-Chang parameters.In addition,the Duncan-Chang parameters of soft are studied by numerical back analysis met hod.The calculation resultsare close to the simplified analysis method,and the feasibility of t he simplified method is verified.3.The numerical simulation method is used to study the settlement deformation characteristics of the foundation of the lower drainage channel of the Tuojiang River under different working conditions.The research shows that:(1)With the height of different dikes,the maximum settlement displacement of the dike body increases by 54.9%,and the maximum settlement displacement of the foundation soil increases by 43.7%.The maximum tensile stress values of the first and third principal stresses of the expansion joint increase as a whole;(2)Under the combination of different inner and outer slope ratios,as the slope ratio decreases,the settlement deformation gradually decreases,and the expansion joints the maximum tensile stress values of the first and third principal stresses decrease as a whole;(3)Under different types of foundation soils,as the compressive modulus of the foundation soil increases,the settlement displacement decreases gradually,and the magnitude of the decrease is In the nonlinear trend,the maximum tensile stress values of the first and third principal stresses of the expansion joint are generally reduced,and the reduction is nonlinear. |
