A model test device for underground engineering excavation with expansion and contraction function

Abstract

The invention discloses an underground engineering tunneling model test device with an expanding and contracting function. The underground engineering tunneling model test device comprises a model test sample, a tunnel structure model, a loading device and an excavating device and further comprises a loading steel frame. The loading steel frame is formed by assembling high-strength steel angles, high-strength connecting plates, high-strength bolts and perspex sheets, and the high-strength steel angles are connected with each other through the high-strength connecting plates and the high-strength bolts in a butt joint mode; the model test sample is placed in the loading steel frame; the tunnel structure model is located in the middle of the model test sample; the loading device is composed of counter force beams, steel plates, component force steel plates and hydraulic jacks; the excavating device is composed of a track beam, a support, an electric heating rod, a wire and a switch. The underground engineering tunneling model test device has the strong expanding and contracting function, meets the requirements for diversity of sizes of test models, is high in accuracy, simple in structure, low in manufacturing cost and beneficial for underground excavation simulation tests and adjoining rock stability analysis, and provides test bases for underground engineering design and construction.

Description

technical field [0001] The invention relates to the technical field of model test devices, in particular to an underground engineering excavation model test device with expansion and contraction functions. Background technique [0002] Tunnels and underground engineering structures have always played a pivotal role in my country's infrastructure construction. They are key factors for improving traffic conditions in mountainous areas, accelerating the layout of national roads and railway networks, and increasing construction mileage. After several decades of development after the reform and opening up, the current tunnel engineering has entered the stage of large buried depth, short construction period, and complex engineering technology. The physical mechanical properties, rock mass structure type and occurrence environment are more complex than shallow strata. In the current deep underground engineering practice, a large number of problems have occurred and caused serious l...

AI Technical Summary

Problems solved by technology

Method 1 is simple to operate, but it is quite different from the real stress environment of deep underground engineering or deep tunnel surrounding rock and the actual mechanical propagation process of surrounding rock, and cannot reflect the real stress status of tunnel surrounding rock

Method 2 can simulate the real force condition of the tunnel, but excavating the soil with tools will easily lead to the collapse of the surrounding soil of the excavated tunnel, resulting in the inconsistency between the excavation boundary and the pre-designed geometric boundary

At present, most domestic and foreign indoor model test methods adopt the combined structure of metal steel frame and jack for two-dimensional or three-dimensional loading. The metal steel frame is mostly welded as a whole or connected by anchor bolts, which restricts the size of the test model to be smaller than the internal size of the steel frame. has certain limitations

However, the structure of underground engineering is complex, the response mechanism of surrounding rock to excavation is not yet clear, and the influence of size effect on test results still needs to be studied

The existing test devices can no longer meet the actual needs of the project in terms of function, operation mode, loading path, etc., and cannot provide a basis for the research on the mechanism cracking and stabilization treatment technology of various abnormal response phenomena of surrounding rocks in deep underground engineering. Therefore, there is an urgent need An improved test equipment and method, which can truly, accurately and scientifically simulate the tunnel excavation process, and provide a reliable basis for tunnel engineering construction and surrounding rock stability analysis and research

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