Foundation Pit Excavation Model Test Device for Coordinated Lifting and Lowering of Water Level and Confined Water Head

Abstract

The invention discloses a foundation pit excavation model testing device capable of cooperatively hoisting a phreatic water level and a pressure-bearing water head. The foundation pit excavation model testing device comprises a model box, a water tank, a symmetrical plane soil retaining unit, a foundation pit supporting structure, a pressure-bearing empty space, a pressure-bearing water head adjusting system and a measuring system, wherein the model box comprises a model box framework and a counter-force plate; the water tank is arranged at the upper right side in the model box; the symmetrical plane soil retaining unit is fixed on the model box framework through bolts; the pressure-bearing empty space is arranged at the bottom of the model box and is connected with the pressure-bearing water head adjusting system; and the pressure-bearing water head adjusting system is compose of a water pressure gauge, a Marriott bottle and a bracket. The foundation pit excavation model testing device can be used for simulating the hoisting of the phreatic water level and the pressure-bearing water head in a foundation pit excavation process; water-soil pressure and deformation of a foundation pit under different phreatic water levels and pressure-bearing water heads are measured, related testing data is sorted, foundation pit stress, deformation development rules and the like are determined, effective testing data supports are provided for researching foundation pit problems caused by the hoisting of the phreatic water levels and the pressure-bearing water heads, and evidences are provided for theoretical analysis models in the future.

Description

technical field [0001] The invention relates to a foundation pit model test device, in particular to a foundation pit excavation model test device under the condition of rising and falling water levels and pressure water heads, which can be used for simulating pressure bearing layers and overlying weak points when the water level and pressure water heads rise and fall. The interaction between soil in permeable foundation pits is used to study the water and soil pressure response and deformation of foundation pits under different phreatic levels and confined water heads. Background technique [0002] There is abundant groundwater in the coastal and riverside areas, and the project often faces the situation that there is still a confined layer below the aquitard at the bottom of the deep foundation pit. Due to large-scale precipitation, seasonal drought, and seasonal changes in the water level of rivers or lakes, the water level will The rise and fall of the water level and th...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a foundation pit excavation model test device in which the phreatic level and the pressurized water head cooperate to rise and fall, which solves the simulation problem of the phreatic level and the pressurized water head coordinated rise and fall in the test, and can simulate the phreatic level The interaction between groundwater and foundation pit soil when it rises and falls in conjunction with the confined water head, measures the water and soil pressure and deformation of the foundation pit under different phreatic levels and confined water heads, sorts out relevant test data and determines the coordination between the phreatic level and the confined water head Issues such as the force and deformation development law of foundation pits during lifting and lowering provide effective test data support for the research on foundation pit problems caused by the rise and fall of phreatic level and confined water head, and provide a basis for the subsequent theoretical analysis model

Images