Device for simulating coupling effect of foundation pit excavation stress field and underground water seepage field

Abstract

The invention relates to the field of engineering model tests, and discloses a device for simulating a coupling effect of a foundation pit excavation stress field and an underground water seepage field. The device comprises a model case, a rainfall device, a water supply tank, two variable waterhead cases and a foundation pit excavation model box located in the model case, a displacement sensor isarranged on the foundation pit excavation model box, soil pressure sensor and water pressure sensors are arranged around the foundation pit excavation model box, a pressure measuring hole is formed in the model case, the pressure measuring hole is connected with a water pressure data collection device through the water pressure sensors, a drip hole is formed in the bottom of the rainfall device,a water pump is arranged in the water supply tank, the water pump is connected with the rainfall device through a rainfall conduit, and the bottom of the variable waterhead case is respectively connected with the water supply tank and the model case through a water supply tank connecting pipe and a model case connecting pipe. The device disclosed by the invention can simulate the mutual influenceof the stress field and the seepage field in an foundation pit excavation process under different underground water feeding conditions, and realizes the measurement of an underground water flow fieldand foundation pit settlement under different foundation pit excavation working conditions by the same experimental device.

Description

technical field [0001] The invention relates to the field of engineering model tests, in particular to a device for simulating the coupling effect of foundation pit excavation stress field and groundwater seepage field. Background technique [0002] With the rapid development of my country's economy and the gradual increase of population, the scale of underground space development is getting larger and larger; the development of underground space has a very obvious disturbance effect on the groundwater flow field, and excessive exploitation will lead to the formation of ground subsidence funnels, resulting in potential safety hazards ; At the same time, the groundwater level in the surrounding strata decreases, resulting in stress redistribution in the foundation pit and consolidation settlement of the foundation, which intensifies the settlement of the building. Therefore, it is of great significance to study the interaction between the stress field of foundation pit excavat...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the fact that there are few researches on the impact of foundation pit excavation on the excavation of large-scale groundwater flow networks in the prior art, and the test devices in the prior art cannot simulate various groundwater recharge conditions and cannot accurately study The problem of the coupling effect between the excavation stress field and the seepage field of the foundation pit under different groundwater supply conditions provides a device for simulating the coupling effect of the stress field of the foundation pit excavation and the groundwater seepage field, which can be used to measure the pressure during the excavation of the foundation pit The water head is measured and analyzed to explore the change of the groundwater flow field during the excavation of the foundation pit; at the same time, it is also possible to analyze the surrounding soil stress and the settlement at the bottom of the foundation pit during the excavation process under different groundwater recharge conditions to explore Influence of Seepage of Groundwater Level on Stress Field of Foundation Pit

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