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Nonlinear Creep Damage Constitutive Model of the Weak Rockmass in Dam Foundation and Its Engineering Application

Author: YangWenDong
Tutor: ZhangQiangYong
School: Shandong University
Course: Geotechnical Engineering
Keywords: Dam foundation soft rock Damage variable Creep damage constitutive model Numerical inversion Rheological parameters
CLC: TV223
Type: Master's thesis
Year: 2008
Downloads: 265
Quote: 8
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Abstract


With the gradual implementation of the country's western development \These high arch dam foundation engineering geological conditions are complex , varying degrees of discontinuous weak interlayer extrusion dislocation with weakened zone within the layer of the alteration zone layer . In excavation unloading , and the long-term effect of the high penetration load , temperature load and seismic loading , high arch dam foundation rock mass above the weak parts will likely produce different degrees of creep deformation , affecting the long-term stability of the dam construction safety and running . Therefore carry out the the dam foundation soft rock creep characteristics of damage mechanics and engineering stability is of great significance . According to the center hole of the dam foundation the weak rock band the deformation test with field compression creep test results , through theoretical analysis and numerical calculation of the the engineering rock creep damage deformation characteristics . Thesis research focused on the following aspects : 1 . Taking into account the effect of degradation and deterioration of the rock mass the rheology mechanics parameters , a variable parameter reflects the dam foundation soft rock creep properties of creep damage constitutive model that rock rheological parameters over time and the gradual weakening of the rheological mechanics parameters of rock mass as unsteady , intuitively reflect the deterioration of the material properties . The derived differential form of creep damage constitutive equations of three-dimensional case , and by C and FISH programming on the limited difference software FLAC 3D < / sup > secondary development to achieve a model program . 3. To uniaxial compressive example analysis model of creep damage properties , and to analyze the impact of the damage variable and injury parameters of creep curves . This model -based , the the Hill Gang Dam in diabase dikes creep damage mechanics parameters obtained by numerical inversion . According to the inversion of the creep parameters , to carry out the dam slope excavation of Dagangshan three-dimensional creep damage stability calculations , analysis of changes in the slope displacement , stress law of the plastic zone , and the distribution of damage zone , get the recommendations and conclusions of important guiding significance for the design and construction of slope excavation .

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic investigation of hydraulic design > Foundation and its reinforcement
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