Centrifugal model test device and method for studying the space effect of the working behavior of the lattice wall enclosure structure

Abstract

The invention discloses a centrifugal model test device and method for studying the space effect of the working properties of the enclosure structure of the grid-shaped ground connecting wall. The device includes a model box, a model wall, a model soil, an excavation system, and a measurement system. The device can directly reflect the three-dimensional stress and deformation characteristics of the grid-shaped ground wall enclosure structure. The structural structure of the model wall in the present invention is consistent with the actual situation, and at the same time, the symmetry is used to take 1 / 4 structure for simulation. While reducing the size of the model and reducing the workload of measurement, it is convenient to study the excavation process of the foundation pit. Spatial effect of the working behavior of the grid-connected wall enclosure structure. The inner and outer surfaces of the model wall are engraved with grooves, which can be conveniently used to simulate the influence of the construction joints between adjacent groove sections of the grid-shaped wall enclosure structure on the spatial effect of its working properties, and the grooves can effectively avoid the test In the process, the resistance strain gauge is easily damaged, and the data acquisition line of the resistance strain gauge has adverse effects on the wall-soil contact.

Description

technical field [0001] The invention belongs to the field of deep foundation pit engineering, and in particular relates to a centrifugal model test device and method for studying the space effect of working properties of a grid-shaped ground connecting wall enclosure structure. Background technique [0002] As my country's urban infrastructure construction has entered a new vertical and three-dimensional development and utilization stage, large-scale urban underground engineering construction such as basements of high-rise buildings, underground shopping malls, underground parking lots, underground substations, and large drainage and sewage treatment systems are in full swing in large cities. carry out. Urban underground engineering construction will involve deep foundation pit engineering. Unreasonable design of deep foundation pit enclosure structure or inaccurate control of the working properties of deep foundation pit enclosure structure may lead to foundation pit instabi...

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Problems solved by technology

[0005] At present, researchers have only carried out centrifugal model tests on the force and deformation characteristics of the latticed ground wall enclosure structure under the quasi-plane strain state, and lack of force and deformation characteristics of the latticed ground wall enclosure structure under the three-dimensional state. Centrifugal Model Test Study on Deformation Characteristics

Since the foundation pit engineering is a typical space problem, there is a corner effect, so the working behavior of the lattice wall enclosure structure during the excavation of the foundation pit has obvious space effects, based on the centrifugal model test under the quasi-plane strain state. The research results cannot truly reflect the three-dimensional force and deformation characteristics of the lattice wall enclosure structure

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