Simulation and test system for excavation of narrow foundation pit in high gravity field

Abstract

The invention relates to a simulation and test system for excavation of a narrow foundation pit in a high gravity field. The simulation and test system is composed of a foundation pit simulation system, a foundation pit supporting system and a measuring system, the foundation pit simulation system comprises a model box, a separating plate and an adjusting rod, the separating plate is vertically located in the model box, one end of the adjusting rod is connected to the separating plate, the other end of the adjusting rod abuts against the inner wall of the model box, the adjusting rod is used for adjusting the position of the separating plate, a space between the separating plate and the model box is used for containing test soil, and the test soil is formed by consolidating mud in the highgravity field; and the foundation pit supporting system includes two retaining walls arranged in parallel with excavated trenches and a supporting rod connected between the two retaining walls, the supporting rod is used for adjusting the distance between the two retaining walls, and the measurement system is used for measuring the strain of the retaining walls and conducting formation settlementmeasurement and changes in the displacement field. The simulation and test system can comprehensively measure various aspects of affects of foundation pit excavation in the high gravity field, can realize full excavation of a foundation pit and can achieve simulation of support adding.

Description

technical field [0001] The invention belongs to the field of comprehensive pipe gallery engineering in geotechnical and underground engineering, and in particular relates to a simulation and test system for excavation of narrow foundation pits in a supergravity field. Background technique [0002] Since modern times, with the rapid development of urban underground space, the utilization technology of underground space has become higher and higher. In recent years, a kind of underground comprehensive pipeline has appeared to solve the problem of complex interlacing of above-ground pipelines and frequent excavation for underground pipeline maintenance. corridor system. The system not only solves the traffic problems of the ground city, but also facilitates the maintenance and repair of municipal facilities such as electricity, communication, gas, water supply and drainage. Damage to lifelines. Compared with general foundation pit engineering, the underground integrated pipe ...

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Problems solved by technology

The characteristics of the comprehensive pipe gallery make it have a special impact on the surrounding strata, which requires special research. The environmental impact of foundation pit excavation is complex, and it is difficult to carry out comprehensive measurements. In centrifugal experiments, many foundation pit excavation simulations only use Symmetrical semi-trench research has a certain impact on the research results

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