Fault making device and operation method for geomechanical model test

Abstract

The invention relates to a fault body making device for geomechanical model test and operating method thereof, the fault body making device comprises the fault body partition plates, the fixing plateof fault body partition plates, bolts and internal-supporting plates; the fault body partition plates are connected through three internal-supporting plates to ensure the stiffness requirements of thedevice, the fault body partition plates are fixed in the guide frame of model support through the fixing plate of fault body partition plates and bolts, so as to ensure the stability of the device during the making of the fault body, the fault body of any thickness and direction can be made by adjusting the distance between the fault body partition plates and their tilt directions, the inventionsolves the problems of difficulty in making a tilted fault body and fixing the direction of the fault body, the device has simple structure and is easy to disassemble, reliable with low cost, the operating method is easy to understand and has wide application prospect.

Description

technical field [0001] The invention relates to an underground engineering test device, in particular to a device and an operation method for making a fault body in a model test. Background technique [0002] With the development of underground engineering construction in my country, more and more large-scale tunnel projects have appeared in the fields of transportation, energy, hydropower, and mining. These tunnel crossing areas often have complex geological conditions and developed faults. The deformation and destruction of tunnel surrounding rock are generally controlled by weak strata such as fault fracture zones, and accidents such as water inrush, mud inrush and tunnel collapse are particularly easy to be induced during construction, which brings great difficulties to the design and construction of tunnel engineering. [0003] The model test method based on similarity theory has always been an important means of underground engineering research, which has played a grea...

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Problems solved by technology

[0006] (1) "Journal of Geotechnical Engineering" No. 9, 2013 introduced a method for preparing stick-slip faults in model tests. It uses two layers of PVC plastic plates coated with butter in the middle to simulate stick-slip faults. However, the PVC plates The existence of the fault will inevitably affect the mechanical properties of the model material near the fault, which is inconsistent with the actual project. At the same time, the method of fixing the fault orientation during the preparation of the model body is not mentioned.

[0007] (2) "Journal of Rock Mechanics and Engineering", No. 3, 2016, introduced a method for preparing inclined faults in model tests. It uses cutting the model on the basis of the complete model body, and cutting the model after cutting. Evenly laying talcum powder on the sides, patting and compacting, and finally backfilling the model material. Although this method can prepare the required faults, the whole process takes a long time, and it also causes a lot of waste, so it is not very practical.

[0008] (3) The invention patent with application number 201310138832.5 proposes a device and method for prefabricating faults, but the device involved in this patent cannot be dismantled and taken out. Once fixed, it cannot be moved during the entire filling of the model material, and at the same time, the model body cannot be moved. Carry out true three-dimensional loading, that is, the device is only suitable for model test research under the stress field of its own weight, and cannot meet the multi-functional requirements

[0009] (4) The invention patent with the application number 201610549967.4 proposes a device and method for preparing a fault-caused structure, but the fault device cannot be dismantled and taken out, and the model material can only be compacted manually, and it is difficult to achieve the required forming pressure , it is also difficult for the prepared model body to meet similar conditions. At the same time, the true three-dimensional stress cannot be applied to the model body in subsequent tests, and the scope of application is very limited.

[0010] (5) The invention patent with the application number 201510056031.3 has developed a bidirectional and multi-angle intelligent flipping model test device, which can realize the production of faults in any direction and thickness, but the device is too complicated, inconvenient to operate, and expensive to manufacture. Good for promotion and application

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