| The process of tunnel excavation,foundation,often Chung water inrush phenomenon caused by the collapse,collapse,switching,breaching of the dike and other accidents in the construction of a large number of buildings,the collapse pit slope or even serious,adjacent buildings will be accompanied by additional gene gravity cracking,subsidence,tilt and collapse.Because of its advantages such as simple construction technology,safe and reliable water plugging effect,low economic cost and so on,the grouting technology of deep strata can provide a good way for the treatment and prevention of water inrush from the project.However,the development of grouting technology is not yet mature,the theoretical research is often lagging behind the grouting water plugging engineering.In this paper,the basic properties of the double liquid used in the practical engineering of water plugging mechanism and diffusion rules of in-depth research,made a series of research results,and provide technical support and basic data for the project evaluation and analysis of water blocking effect.(1)The gel time,the total pore volume and the linear expansion coefficient of the solid solution decreased with the increase of the mixture ratio of the slurry,and the viscosity of the slurry increased with the increase of the mix proportion.The gel time of the double liquid mainly distributed in 50s~367s;node internal pore slit pore entity for flaky particles accumulation,mainly distributed in the 2 nm ~10 nm,which belongs to the category of mesoporous;Viscosity coefficient time-varying exponential distribution,viscosity coefficient with time,with the increase of the ratio of all showed increasing trend.At the same time,the double liquid viscosity coefficient variation can be divided into 3 stages: the initial low viscosity period,rising period,period of rapid increase in low viscosity,double liquid viscosity rises slowly,and in the initial stage,rising trend of rapid rise in viscosity increased sharply.(2)Combined with the construction process and test the characteristics of building fissure water conducting structure grouting water model experiment platform to observe the evolution laws of the fracture process of the double liquid per fusion in the interface characteristics and flow out of pulp.Among them,the phase boundary interface is divided into 4 forms,which are mixed with each other,do not mix,do not mix,mix and dissolve completely.Among them,in the process of single crack grouting in the main interface and double liquid ratio,when compared with the small and micro group from the main slurry,diffused into the water,are mixed with the phase interface;with the ratio increases gradually from the interface does not mix to completely miscibility flooding for change.But in comparison with high,since the height of slurry density,high performance for severe mixed miscibility.(3)According to the linear regression theory,the quantitative and qualitative relationship between the grouting radius(R),the grouting quantity(Q)and the mixture ratio(M),the crack opening(K),the hydro-static pressure(S)and the grouting pressure(P)were investigated.The influence of different grouting factors on the diffusion radius and grouting quantity of grout is different,the diffusion radius,grouting quantity and grouting pressure,the crack opening are in direct proportion,and with the water pressure,the mix ratio is inversely proportional.(4)The viscosity variation equation based on the establishment of horizontal crack grouting considering viscosity the spatial variation of the diffusion model,deduces the slurry in the diffusion region of each particle slurry viscosity time,distribution equation,and further derive the single fracture under non Newtonian fluid migration diffusion model. |
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