Development And Application Of New Fluid-solid Coupling Model Similar Materials In Complex

To meet the needs of national economic and social development,the water resources and hydropower engineering,traffic construction,mining and energy exploitation and defense engineering and other infrastructure,more and more project development to kilometers underground,such as the high in-situ stress and groundwater in deep underground engineering complex geological environment,often can cause deep underground space appear sudden water inrush and mud,landslides and other disasters,cause huge economic loss and a large amount of construction work personnel casualties.It is of great significance to reveal the evolution mechanism of deep underground engineering to ensure the safe construction and stable operation of deep underground engineering.For high ground stress and high osmotic pressure disaster evolution mechanism of coupling conditions of deep engineering theory difficult distortion is difficult to analysis,numerical simulation and field test condition is limited,and the physical model test for its repeatable simulation conditions,construction disaster evolution process under the conditions and factors of advantage,to discover and explore new phenomenon,new law of deep underground engineering,become a new theory to study the mechanism to cause an,verify the indispensable important means.In order to carry out the fluid-solid coupling model test in deep engineering under the complex environment of high in-situ stress and high osmotic pressure,it is necessary to have the corresponding model similar materials.This paper,according to the similarity theory,through dimensional analysis and theoretical derivation,established the high stress and high osmotic pressure effect of fluid-structure interaction similarity criterion,according to the similarity criterion established fluid-structure interaction,satisfy the fluid-structure coupling is developed similar conditions of similar material,and successfully used in the yunnan water diversion of fluid-solid coupling model test,verify the reliability of the material.The main research results are as follows:A.Based on the size-like theory and dimensional analysis,the size-like criterion of fluid-solid coupling considering the coupling effect of high in-situ stress and high osmotic pressure is derived,including size-like criterion of permeability coefficient,size-like criterion of seepage flow,size-like criterion of flow velocity and size-like criterion of osmotic pressure.B.According to the deduced fluid-solid coupling similarity criterion,the composition of similar materials was selected.Aggregate barite powder,quartz sand and fine iron powder,the cementing material is white cement,the adjustment material is silicon oil;Besides,the design of the test scheme,the manufacture of the specimen and the mechanical test were carried out to obtain the similar material(QBIWS similar material for short)that meets the similar condition of fluid-solid coupling.The empirical formulae of key physical and mechanical parameters were obtained by sensitivity analysis and multiple linear regression analysis.C.Application development of new fluid-structure interaction similar materials(QBIWS similar material),deep buried tunnel diversion incense burner mountain in the middle of yunnan province as the research background of engineering,carried out a deep tunnel excavation of fluid-solid coupling true three dimensional geomechanics model test,the surrounding rock in the process of tunnel excavation hole radial displacement,radial stress,and the changing rule of the osmotic pressure,and is verified by the corresponding numerical analysis,the reliability of the research of fluid-solid coupling model material revealed through effective geomechanics model test to deep catastrophe mechanism construction provides a strong theoretical support and material guarantee.