Experimental device and method for flowing water sand carrying under effect of simulated seepage-vibration

Abstract

The invention belongs to the technical field of open pit mining of a coal mine, and particularly relates to an experimental device and method for flowing water sand carrying under the effect of simulated seepage-vibration. A flowing water sand carrying process in a water-containing sand bed under the water injection conditions of change of groundwater level, rainfall penetration and the like under the effects of high water head difference and vibration is simulated in a laboratory, related anisotropic flowing water sand carrying parameters and a saturation line distribution law under different water injection conditions are acquired, inner structural features in the sand bed and a dynamic evolution and water-sand two-phase flow integral migration trend of a seepage path are observed, and therefore, mutual relations and mechanisms of action of the inner structural features of the water-containing sand bed, flowing water sand carrying parameters and a water-sand two-phase flow migration law in a hole are disclosed.

Description

technical field [0001] The invention belongs to the technical field of open-pit mining in coal mines, and in particular relates to a dynamic water sand-carrying experimental device and method under the action of simulating seepage-vibration. Background technique [0002] In the process of open-pit mining in Inner Mongolia and Northwest China, a large number of composite slopes with thin bedrock and thick sand layers with water content are faced. And under the action of vehicle load, mining earthquake, blasting and other vibrations around the open-air slope, it migrates in the seepage channel formed by the sand pores, forming a water-sand two-phase flow, which is gradually carried out of the slope and accumulated on the surface. The porosity inside the open-air slope gradually increases, forming a large area of ​​holes, and the internal erosion occurs, the shear strength index of sandy soil drops significantly, and even causes the slope to be damaged and unstable, endangering...

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Problems solved by technology

[0005] At present, there are relatively few experimental devices for dynamic water sand-carrying, mainly focusing on piping, mine water inrush and sand collapse, etc. Regarding the observation of the internal structure and seepage path of the sand layer, the infiltration characteristics of the sand layer and the parameters related to the dynamic water sand-carrying characteristics It is relatively difficult to obtain and needs to be further improved, especially for open-pit mine composite slopes under the influence of high water head difference and vibration. The characteristics of sand-carrying characteristics, migration path, internal structure of sand layer and dynamic evolution process of seepage path in heterogeneous dynamic water need to be further studied

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