Centrifugal model test device and method for researching spatial effect of working properties of lattice-shaped diaphragm wall enclosure structure

Abstract

The invention discloses a centrifugal model test device and method for researching the spatial effect of the working properties of a lattice-shaped diaphragm wall enclosure structure. The centrifugal model test device comprises a model box, a model wall, model soil, an excavation system and a measurement system, and the centrifugal model test device can directly reflect the three-dimensional stress deformation characteristics of the lattice-shaped diaphragm wall enclosure structure. The structural construction of the model wall is kept consistent with the actual situation, meanwhile, a 1 / 4 symmetry structure is used for simulation, the model size is reduced, the measurement workload is reduced, and meanwhile, the spatial effect of the working character of the lattice-shaped diaphragm wall enclosure structure in the foundation pit excavation process can be conveniently researched. Grooves are formed in the inner surface and the outer surface of the model wall body in a carving mode, so that the influence of a construction joint between adjacent groove sections of the lattice-shaped diaphragm wall enclosure structure on the spatial effect of the working property can be conveniently simulated; and meanwhile, the grooves can effectively solve the difficult problems that the resistance strain gauge is easy to damage in the test process, a data acquisition line of the resistance strain gauge has adverse effects on wall soil contact and the like.

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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