Model testing device of influence on deformation of adjacent buildings by foundation pit group excavation

Abstract

The invention relates to a model test device for the influence of foundation pit group excavation on the deformation of adjacent buildings. A multi-layer frame building model is placed in the left part of the model box, and an underground continuous wall model is placed in the middle and right parts of the model box respectively. The horizontal support model is fixed inside the wall model, the foundation pit floor model is fixed at the bottom, and the excavation construction simulation device of the foundation pit group is installed inside. and a plurality of dial gauge brackets, each displacement gauge is fixed on the upper surface of the soil or inside the soil layer through the displacement gauge bracket, and each dial gauge is fixed on the surface of the multi-layer frame building model through the dial gauge bracket, and the multi-layer A plurality of strain gauges are attached to the bottom of the base plate of the framed building model. The invention simulates the settlement of the surrounding stratum and the deformation of adjacent buildings caused by the excavation construction of the urban foundation pit group, and has important value for formulating the construction standard of the foundation pit group and the safety protection of the surrounding strata and adjacent existing structures.

Description

technical field [0001] The invention belongs to the field of foundation pit engineering in urban underground space development and underground construction engineering, and in particular relates to a model test device for the influence of foundation pit group excavation on the deformation of adjacent buildings. Background technique [0002] With the further development of urbanization in our country, people pay more and more attention to the development and utilization of underground space, and foundation pits are gradually becoming larger and deeper, and the problems caused by this are becoming more and more prominent, especially in Shanghai, Beijing, etc. In the first-tier cities, foundation pits are more dense, and a large number of construction conditions of foundation pit groups appear. The excavation sequence and process of foundation pits directly affect the deformation of surrounding strata and adjacent buildings. However, the existing research mainly focuses on the ...

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Problems solved by technology

The theoretical analysis method uses the theory of elasticity and simplifies the research model through assumptions, but to a certain extent, it cannot accurately consider the complex relationship between the foundation pit and the soil, and the amount of calculation is large; the numerical simulation method generally requires the use of large-scale commercial software. The establishment of the model is complex and time-consuming

In addition, due to the limitations of geotechnical testing equipment, it is difficult to obtain accurate soil physical and mechanical parameters, and changes in soil parameters have a great impact on numerical simulation results, so it is easy to cause deviations in calculation results

On-site monitoring method is one of the means to obtain the settlement of the surrounding stratum during foundation pit excavation. However, due to the limitations of instruments and equipment and human observation factors, the on-site test results have certain deviations. At the same time, on-site monitoring requires a certain amount of manpower and material resources. The test components are easily damaged during construction, thus delaying monitoring or even obtaining wrong monitoring information

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