Analysis and Evaluation of Three-dimensional Geology Mechanical Model Experiment
Publikationen: Forschung › Masterarbeit
Three-dimensional geo-mechanics model test is one of the effective means to solve the problems of underground geotechnical engineering it can be intuitively, qualitatively and quantitatively reflect the force and structural characteristics of crude rock mass, the relationship between rock mass and underground engineering structure. Similar material plays an important role in model test system, the properties including, statics parameter: density, cohesive force, uniaxial compressive strength, elastic modulus, speed of longitudinal wave and dynamic parameters: dynamic tensile strength and dynamic strength, those parameters would have direct and indirect influence on final performance of model experiment. The conception of geo-mechanical model test is first time raised by Professor E.Fumagalli in 1967 at the international conference on rock mechanics, with a lot of scientists and scholar’s unremitting endeavor, there are amount of achievements and inventions in this area, giving support and guidance in mining projection, subway projection and mountain disaster prevention. However, most experiments are researched popularly by static analysis, dynamic analysis is not often employed in this system, so the data of correlative model materials for blasting and impaction is of scarcity. MEC-3D model test system ,which developed by China University of Mining (Beijing), is capable of static experiment such as tunnel excavation and dynamic experiments, but because of the limit of model materials, there are few research in the dynamic part. We want to research a kind of materials which has such properties, high density, high strength and fast solidification and cover the shortage, in the same time, use numerical analysis method to evaluation this machine’s maximum deformation under the worst situation to guarantee the safety of people. According to some references, we decide to use quartz sand, gypsum, cement and iron concentrate to constitute new materials, and water content is another important parameter. Adjusting different parts’ percentage, make enough mount of standard samples, using universal testing machine to get sample’s statics parameters, use Hopkinson Bars Technique to get sample’s dynamic parameters. After collecting enough valid data, using range method and variance method to analysis the database. Software Abqus 6.14 is used to build the numerical model and evaluate this machine’s maximum deformation with that we can calculate how much enough it could endure by back stepping technique, so that the worst situation can be confirmed.