CN103439250A - Sustainable tracing energy storage type loading device - Google Patents

Abstract

The invention discloses a sustainable tracking energy storage type loading device, which consists of a test frame and a loading system. The loading system includes two parts: an elastic real-time conversion mechanism 200 and a hydraulic jack unit 100 placed on the top of the elastic real-time conversion mechanism; wherein, the elastic real-time conversion mechanism consists of an upper plate 210, a lower plate 220 and a The elastic energy storage mechanism 230 is formed; the test frame 300 includes a reaction force frame and four high-strength bolts with adjustable height; the test frame and loading system are placed in a high-strength plexiglass protective box 400 . Compared with the existing loading device, the present invention realizes the continuity and continuity of the loading process, avoids the phenomenon of broken load during the indoor test of geotechnical engineering, ensures the authenticity of the boundary conditions of the indoor test, meets the needs of the experiment, and greatly Improve the accuracy of the experiment.

Description

A sustainable tracking energy storage loading device

technical field

The invention relates to indoor test loading equipment for geotechnical engineering, in particular to the technical field of a real-time continuous pressure test device necessary for simulating rockburst and large deformation of rock and soil mass.

Background technique

Long tunnels are an indispensable part of many traffic projects, water conservancy and hydropower projects. As a typical underground project, the existence of the initial in-situ stress field directly determines the construction and operation status of the project. As one of the three major means of studying the mechanics of underground engineering construction, the indoor test is the key to the credibility of the test results, how to create a real initial stress field, scientifically simulate the proportion of materials, and maintain correct boundary conditions.

For the establishment of the initial in-situ stress field, hydraulic jacks are generally used to complete the pressurization. The necessary initial ground stress field can be obtained by reasonable combination of different numbers of jacks, but after tunnel excavation, displacement will occur due to radial unloading of rock and soil mass. However, in the current loading system, in the process of simulating tunnel excavation and unloading, there are generally load interruptions and phenomena that cannot be applied in real time. As a result, the jack cannot provide pressure in real time, resulting in distortion of boundary conditions, so that the disturbed stress field deviates from the real stress field. Realistically simulate the impact of tunnel construction, such as the stability of surrounding rock, rockburst, large deformation and other typical problems. The current loading system generally has the phenomenon that the load is interrupted and cannot be applied in real time during the excavation and unloading of the tunnel. This phenomenon directly affects the variation continuity of the stress field in the laboratory test, resulting in the secondary stress field and support after the tunnel excavation. After the construction of the structure, the three stress fields and the final steady-state stress field will produce distortion; on the other hand, in the face of special geological conditions, such as large deformation, rockburst, high-pressure water inrush and other geological disasters, the The loading device cannot be simulated scientifically, which leads to deviations or even errors in the test results, and can not guide the design and construction reasonably and effectively. One of the main reasons is the distortion of the loading system. In order to fundamentally solve this problem, the loading device must be Breakthroughs in key components.

Contents of the invention

In view of the above deficiencies in the prior art, the purpose of the present invention is to obtain a sustainable tracking energy storage type loading device to create a real initial stress field, maintain correct boundary conditions and reproduce the scientific stress redistribution field, and make the It has the advantages of simple operation, low cost and high experimental accuracy.

The purpose of the present invention is achieved by the following means:

A sustainable tracking energy storage type loading device, which is composed of a test frame and a loading system, is characterized in that the loading system includes two parts: an elastic real-time conversion mechanism 200 and a hydraulic jack unit 100 placed on the upper part of the elastic real-time conversion mechanism; wherein, The elastic real-time conversion mechanism is composed of an upper plate 210, a lower plate 220, and an elastic energy storage mechanism 230 placed between the upper plate and the lower plate; the test frame 300 includes a reaction force frame and four high-strength bolts with adjustable height; the test frame and the loading system are placed in a high-strength plexiglass protective box 400.

The using method of the loading device of the present invention can be summarized as the following steps:

(1) According to the geological environment of the simulated object, roughly determine the total pressure required by the model;

(2) Combining the parameters of the elastic real-time transformation mechanism, determine the total number of loading devices required for the model and the distribution on the model stand;

(3) Reasonably determine the position of each loading member, and the number of elastic real-time conversion mechanisms corresponding to each servo control system, and reasonably determine its position;

(4) Pressurize through the servo control system to realize the simulation of the initial stress field, and then carry out related construction such as excavation and support to reproduce the stress redistribution field until the end of the test;

(5) Unload the loading system, recover the elastic real-time conversion components, and perform necessary verification, correction and processing on them for the next use.

In the process of simulating the initial ground stress, firstly, pressure is applied to the elastic conversion mechanism through the hydraulic jack. Since the displacement on the other side is limited by the model frame, the elastic energy will be accumulated and the pressure will be transmitted during the pressurization process. onto the model stand. The elastic deformation energy conceived by the elastic transformation mechanism can be deformed in real time according to the deformation amount when the displacement is generated due to excavation and unloading, so that the conceived elastic energy can be converted into load in real time and applied to the model frame in the form of tracking, thereby Realize the real effect of the tunnel excavation process on the tunnel structure and surrounding rock.

Compared with the previous loading device, the present invention has the following advantages:

(1) The modification of the loading device is simple and easy, and the processing of the elastic conversion mechanism is convenient and effective. Combined with the initial in-situ stress field to be applied, the matching elastic real-time loading system can be selected;

(2) The continuous loading effect is obvious, avoiding the load-break phenomenon caused by the radial unloading of tunnel excavation, and can effectively simulate the rockburst phenomenon under high ground stress conditions, and even the rock burst phenomenon under uniaxial compression conditions;

(3) The cost of the test loading device is easy to control. Under the premise of significantly improving the scientificity of the test results, the investment will not be greatly increased. By connecting with the hydraulic servo control system, the precise application of the load and real-time recording and feedback can be realized.

The accompanying drawings are as follows:

Fig. 1 is a schematic diagram of the real-time conversion mechanism of the present invention.

Fig. 2 is a schematic cross-sectional view illustrating the conversion mechanism of the uniaxial loading system of the present invention as an example.

Detailed ways

Below in conjunction with accompanying drawing and example the present invention will be further described:

The sustainable tracking energy storage type loading device is composed of a test frame and a loading system. The loading system includes two parts: an elastic real-time conversion mechanism 200 and a hydraulic jack unit 100 placed on the upper part of the elastic real-time conversion mechanism. Among them, the elastic real-time conversion mechanism is composed of an upper plate 210, a lower plate 220, and an elastic energy storage mechanism 230 placed between the upper plate and the lower plate; the test frame 300 includes reaction force frames (310 and 320) and four root high-strength bolts (331, 332, 333, 334); the test frame and loading system are placed in the high-strength plexiglass protective box 400.

In this embodiment, the elastic energy storage mechanism 230 is a spring set, (the front part of the high-strength plexiglass protective box 400 is cut off for easy observation).

The method of using the loading device, taking the uniaxial compression test as an example, includes the following steps:

(1) Adjust the height of the four high-strength bolts in the reaction frame to match the loading system, specimen size and height;

(2) Place the specimen to be tested, select the matching real-time conversion system, and debug the loading system.

(3) Install a high-strength protective box.

(4) Carry out loading tests to determine the conditions for rockburst or large deformation of different test blocks.

In actual implementation, various implementations can also be constructed according to the basic structure of the present invention, for example: the elastic energy storage mechanism can also use other equivalent mechanisms for storing elastic energy, such as high-strength airbags, Flexible hydraulic mechanism, etc. In addition, although the present invention is described with a single-axis loading structure, there should be no substantial difference when it is applied to a multi-axis loading system.

Claims (3)

1. a sustainable tracking accumulating type charger, be comprised of test stand and loading system, it is characterized in that, loading system comprises the real-time transformation mechanism of elasticity (200) and is placed in (100) two of the hydraulic jack unit part on the real-time transformation mechanism of elasticity top; Wherein, the real-time transformation mechanism of elasticity is by upper plate (210), lower plate (220) and be placed in upper plate and lower plate between spring energy storage mechanism (230) form; Test stand (300) comprises reaction frame and adjustable for height four high-strength bolts; Test stand and loading system are placed in high strength organic glass protective housing (400).

2. a kind of sustainable tracking accumulating type charger according to claim 1, is characterized in that, described spring energy storage mechanism (230) is groups of springs.

3. a kind of sustainable tracking accumulating type charger according to claim 1, is characterized in that, described charger can adopt the loading structure of single shaft and multiaxis.

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