A true triaxial rockburst physical simulation test system for deep tunnels

Abstract

The invention relates to a physical simulation test system for true triaxial rockburst of a deep-buried tunnel, and belongs to the technical field of rock engineering. The physical simulation test system for true triaxial rockburst comprises a true triaxial loading system consisting of a counterforce rack, a vertical loading system, a horizontal fore-and-after loading system and a horizontal left-and-right loading system, wherein the counterforce rack is formed by connecting and combining a steel beam frame, a front door and a back door through pulling rods; the vertical loading system is fixedly arranged at the top of the interior of the counterforce rack; the horizontal fore-and-after loading system is fixedly arranged on the inner wall of the back door; and the horizontal left-and-right loading system is fixedly arranged on the right side wall inside the counterforce rack. According to the physical simulation test system, independent large-tonnage loading in three directions can be provided to meet the loading requirement of a model test under deep-buried high stress condition, the surface of a test piece can be uniformly stressed, an excavation hole on the steel beam frame can be opened after loading so as to excavate the test piece, and blasting disturbance can be stimulated by vibration jacks in the three directions; and the physical simulation test system can be applied to physical simulation test research on rockburst of the deep-buried tunnel.

Description

technical field [0001] The invention relates to a true triaxial rockburst physical simulation test system for deep tunnels, belonging to the technical field of geotechnical engineering. Background technique [0002] In order to meet the needs of the rapid development of my country's national economy, strategies such as "West-to-East Electricity Transmission" and "South-to-North Water Diversion" have been implemented one after another, followed by a large number of deep-buried long tunnels (tunnels, roadways) under complex geological conditions. The technical difficulty is rare in the world. These long tunnels with high buried depth are found in the fields of water conservancy and hydropower engineering, transportation engineering, railways, highways, mining engineering, nuclear waste disposal, national defense construction and other fields. For example, the diversion tunnel of Jinping II Hydropower Station has a maximum buried depth of 2,525 meters. , the mining depths of Ho...

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Problems solved by technology

[0008] (1) The loading capacity of some experimental devices is low (such as flexible bladder or hydraulic pillow loading), which cannot provide a large enough load to simulate the high ground stress state of deep buried rock mass

[0009] (2) Due to the defects of the loading device (for example, each small jack in each loading direction transmits the load to the specimen through its own small bearing plate), the force on the specimen will be uneven, and unevenness will occur on the surface of the specimen. The necessary shear stress affects the accuracy and reliability of the experimental results

[0010] (3) None of the currently published 3D physical simulation test systems have devices or methods that can reflect the impact of blasting disturbance on the stability of excavated tunnels. The occurrence of rockburst in formed tunnels has a great influence and even plays a controlling role

[0011] The publication number of the Chinese patent application is CN102636386A, the publication date is August 15, 2012, and the title of the invention is "Large Tonnage Uniform-Centralized Loading System". The stress on the specimen is uniform, but the loading system is only a simple one-way loading system, and the force on the model specimen is one-dimensional

[0012] As the burial depth of underground rock engineering becomes larger and larger, rockburst disasters become more and more prominent. Due to the complexity of the experimental system and the extremely high requirements for the loading capacity of the equipment, there is currently a lack of special true triaxial testing for deep tunnels. Rock Burst Physical Simulation Experimental Device

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