3D (Three-Dimensional) similar physical testing device for simulating fault dislocation

Abstract

The invention discloses a 3D (Three-Dimensional) similar physical testing device for simulating fault dislocation. A testing stand is provided with a scale identifying structure; a testing model blockcomprises a transparent acrylic plate rectangular box body and testing soil; the transparent acrylic plate rectangular box body is filled with the testing soil; the transparent acrylic plate rectangular box body is arranged in the testing stand and is tightly fitted with the testing stand; first loading plates are horizontally arranged on the bottom end surface of the transparent acrylic plate rectangular box body; second loading plates are vertical to the first loading plates and are located on the end surface of one side of the transparent acrylic plate rectangular box body. According to the 3D (Three-Dimensional) similar physical testing device for simulating the fault dislocation, provided by the invention, the fault occurrence can be accurately simulated, meanwhile, a fault activation process can be quantitatively simulated on the premise that '3D box effect' is prevented from happening and a simulation initial stress field is ensured, observation on a lining cracking process anda failure mode can be realized, the testing accuracy and the testing reasonability are ensured, and the testing normalization and the testing operability are increased.

Description

technical field [0001] The invention relates to the technical field of test devices, in particular to a three-dimensional similar physical test device for simulating fault dislocation. Background technique [0002] Similarity simulation test has always been the mainstream test verification method in today's test research. Similar materials are used to simulate real engineering conditions such as tunnels and underground structures, and experiments are used to observe and study mechanical phenomena such as deformation, movement and destruction of engineering lining structures and surrounding rock masses. , through similar simulation tests to further understand the mechanism of lining-surrounding rock coupling stress transformation, which is very beneficial for seeking effective tunnel engineering lining-surrounding rock coupling ultimate stress threshold. [0003] A large number of engineering practices have shown that tunnels and underground engineering fault sections are the...

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Problems solved by technology

[0004] Moreover, in the current similar simulation tests, most of the three-dimensional test simulation test devices use fixed model devices, or modified two-way staggered simulation devices, or dumped three-dimensional test devices that ignore the influence of gravity. When it is installed in the test box, the model composed of test soil is used to simulate faults in underground engineering structures such as tunnels, which will cause relative displacement between the model composed of test soil and the test box, resulting in greater friction, resulting in " Stereoscopic box effect”, which leads to uneven stress and affects the accuracy of test data, and when the axial stress becomes larger, the boundary effect is particularly obvious, making it difficult to carry out the test of the predetermined stress path, resulting in poor operability;

[0005] At the same time, for the two-way staggering simulation device, the rigid loading method is usually used. The deformation of the test soil is small and the strain is large. The load plates will contact each other at the included angle to restrict the misalignment of the principal stress direction, which will affect the accuracy of the test data and the operability is poor;

[0006] For the tilted three-dimensional test device, when simulating fault dislocation, the three-dimensional model is usually placed upside down, and the fault dislocation is simulated by applying an action in the horizontal direction. When a reverse fault is dislocated, when the ratio of the vertical dislocation to the horizontal dislocation is greater than the fault dip tangent, a cantilever beam structure will appear in the hanging wall. Therefore, it is difficult to simulate the cantilever beam structure of the hanging wall by the above method, which also affects the accuracy of the test data. , and poor operability

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