Test device and test method for simulating soil arching effect

Abstract

The invention relates to a test device for simulating a soil arching effect. The test device comprises a test box and a lifting device, wherein a settling unit plate and nonsettling unit plates are arranged at the bottom of the test box; the lifting device comprises a rising and falling power device, a jacking tube platform plate and a jacking tube; the jacking tube platform plate rises or falls by the rising and falling power device; the jacking tube is used for rising and falling of the settling unit plate. Compared with the prior art, the test device has the advantages that the soil arching effect of backfill of works under a variety of working conditions can be simulated, and the soil arching effect of foundations of works in case of large deformation can be simulated.

Description

Technical field [0001] The invention relates to the field of geotechnical engineering test devices, in particular to a universal soil arching effect simulation test device and a use method thereof. Background technique [0002] The study of soil arching effect has been a hot topic in recent years. It plays an important role in many fields such as retaining walls, roadbeds, pipe culverts, tunnels, etc. The theory of soil arching effect has also been developed. [0003] In the study of soil arching effect, since Marston proposed the first in 1913 to create the theory of culvert soil pressure calculation, the procedures for establishing soil arching effect theory are basically the same: such as "Research on the Theory of Vertical Earth Pressure of Reinforced Concrete Box Culvert-Trapezoidal Valley Culvert (Chen Baoguo et al., Rock and Soil Mechanics)", "Research on Active Earth Pressure of Cohesive Fill Retaining Wall Considering Soil Arching Effect (Tu Bingxiong et al., Chinese Journ...

AI Technical Summary

Problems solved by technology

The idea of ​​the above literature is good, but it cannot study the soil arch effect of pipe culvert or box culvert

In addition, the displacement of soil between piles is not the same at different pile numbers. The above two documents did not consider the above factors when conducting tests, so the soil arching effect under different displacements of soil between piles cannot be studied.

[0007] The actual working conditions of different projects are varied, such as figure 1 Pipeline backfill under plane strain conditions shown, figure 2 The subgrade pipe and culvert filling shown, image 3 The trapezoidal valley box culvert shown in the backfill, Figure 4 The above-mentioned actual engineering problem is generally that the vertical displacement of the pipe / pipe culvert / box culvert is relatively large compared with the surrounding soil due to its heavy weight (active arch effect) ), but when the pipe / pipe culvert / box culvert adopts pile foundation, the displacement of the structure in this case is smaller than that of the surrounding soil, and the similar simulation test of the soil arch effect in this case has not been carried out enough Research on (Passive Arch Effect Caused by Pipe Culverts)

In addition, the displacement of structures has a large spatial effect, but there is no literature report to conduct experimental research on this problem

[0008] To sum up, the existing test settings are mainly set up for a certain type of engineering situation. When studying another engineering situation, it is necessary to redesign the test instruments, and there is a lack of relatively general soil arch effect test instruments.

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