Test apparatus for flexible loading and instantaneously unloading of high geostress, and test method

Abstract

The invention discloses a test apparatus for flexible loading and instantaneously unloading of high geostress. The apparatus comprises a self-reaction force-loading frame device which is provided with a tunnel model device; the tunnel model device is provided with a flexible rubber capsule and a sensor; the upper part of the tunnel model is provided with a loading device; both the flexible rubber capsule and the loading device are connected with a loading control system; and the sensor is connected with a dynamic signal analyzer disposed out of the tunnel model. The invention also discloses a test method by using the apparatus. The apparatus provided by the invention is relatively small in model size, can be manufactured in a short time, and is beneficial to instantaneous unloading excavation test of a deep tunnel which needs a lot of tests to complete. The test method can realize simulation the instantaneous unloading excavation process of the deep tunnel by instantaneous oil unloading of hydraulic oil in the flexible rubber capsule.

Description

technical field [0001] The invention relates to a deep geotechnical engineering technology for mining, energy, hydropower, transportation, national defense, etc., in particular to a high ground stress flexible loading instant unloading test device and test method. Background technique [0002] The 19th century is the century of bridges, the 20th century is the century of high-rise buildings, and the 21st century is the century of human development and utilization of underground space. With the rapid development of my country's national economy, many underground projects under construction and to be newly built continue to go deep. Whether it is underground tunnels for mining of mineral resources, underground tunnels for transportation construction, and underground caverns for hydropower development, they are gradually developing to a depth of more than one kilometer or several kilometers. With the increase of burial depth, a series of new characteristic scientific phenomena ...

AI Technical Summary

Problems solved by technology

The system cannot simulate the process of instant unloading and excavation in deep caverns

[0005] (2) Shandong University patent 200820023048.4 discloses a high-pressure loading structural model test system. The device adopts six-sided high-pressure loading, which can simulate the true triaxial loading of rock mass specimens, and has high loading automation and loading accuracy, and multiple loading functions. , realize the axial loading and opening of the cavern, the loading system has the advantages of high rigidity, simple and convenient operation, etc., but this system cannot simulate the process of instant unloading and excavation of deep caverns

This device cannot simulate the process of instant unloading and excavation in deep caverns

[0007] (4) Shandong University patent 200810138981.0 introduces a self-balancing true three-dimensional loading model test bench with a sliding wall, but the device model is cumbersome and complicated to operate , the surface of the model body is far away from the outside of the device, it is not convenient for excavation observation, and it is impossible to simulate the process of instant unloading and excavation of deep caverns

The system cannot simulate the process of instant unloading and excavation in deep caverns

[0009] (6) Shandong University patent 201110039078.0 introduces a large-scale free combination type high ground stress underground engineering model test device, including several assembled reaction force bench devices, and each reaction force bench device includes top beams, side Beams, bottom beams, top beams and side beams, and between side beams and bottom beams are connected by flanges and high-strength bolts. Each reaction force bench device can be interconnected or connected with front and rear reaction force beams. There are hydraulic loading systems on the top beam and side beams. The invention is flexible in assembly, simple in operation, convenient in loading and observation, and equipped with a model lift and translation trailer system, but this device cannot simulate the process of instant unloading and excavation in deep caverns.

[0012]1. The size of the model is large, the model making cycle is long, and the model stacking cannot be completed in a short period of time, which is disadvantageous compared with the high ground stress flexible loading instant unloading test;

[0013]2. None of the above devices and systems can simulate the excavation process of instant unloading in deep caverns

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