Three-dimensional non-uniform loading/unloading and steady pressure model test system

Patent metadata

Field	Value
Publication number	US-10408718-B2
Application number	US-201715762712-A
Country	US
Kind code	B2
Filing date	Apr 28, 2017
Priority date	Apr 28, 2017
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A pressure three-dimensional non-uniform loading/unloading and steady pressure model test system has a pressure three-dimensional non-uniform loading/unloading device. The pressure three-dimensional non-uniform loading/unloading device is controlled via an input instruction of the hydraulic loading/unloading and steady pressure automatic control system to carry out pressure three-dimensional gradient non-uniform loading/unloading and steady pressure control. An automatic model displacement test system automatically acquires the displacement of any part inside a test model. A multi-probe peeping system observes a cavern excavation deformation and failure process dynamically in real time.

First claim

The invention claimed is:

1. An auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system, comprising:
a counterforce device;
a pressure three-dimensional non-uniform loading/unloading device;
a hydraulic loading/unloading and steady pressure automatic control system;
an automatic model displacement test system; and
a multi-probe peeping system, wherein the pressure three-dimensional non-uniform loading/unloading device is automatically controlled via an input instruction of the hydraulic loading/unloading and steady pressure automatic control system to carry out pressure three-dimensional gradient non-uniform loading/unloading and steady pressure control; the automatic model displacement test system automatically acquires displacement of any part inside a test model; and the multi-probe peeping system observes a cavern excavation deformation and failure process of a cavern located within the test model dynamically in real time;
wherein the pressure three-dimensional non-uniform loading/unloading device comprises 33 loading units which are respectively fixed on upper, lower, left, right and rear surfaces of the counterforce device to carry out active three-dimensional loading, and a front of the test model adopts a displacement constraining passive loading mode, and
wherein the 33 loading units are included and divided in eight groups, six loading units in a first group of the eight groups are arranged at a top of the test model, six loading units in a second group of the eight groups are arranged at a bottom of the test model, and six loading units from top to bottom with each group of the three groups including four loading units; and nine loading units are arranged on a rear surface of the test model and divided into three groups from top to bottom with each group including three loading units.

2. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 1 , wherein the counterforce device is formed by connecting detachable members each having a square cross section, adjustable in size, used for accommodating the test model and used as a counterforce device for loading in test; the counterforce device comprises a bottom beam having a square cross section; a top beam having a square cross section, a left upright post having a square cross section, a right upright post having a square cross section, a front counterforce wall member having a square cross section and a rear counterforce wall member having a square cross section; the bottom beam and the top beam are distributed up and down and connected with each other via the left and right upright posts to form a rectangular frame structure, the front counterforce wall member and the rear counterforce member are arranged in the front and the back of the rectangular frame, and the whole counterforce device is combined via a connecting device.

3. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 2 , wherein a transparent excavation window is arranged in the middle of the front counterforce wall member and comprises a steel frame and a glass panel, and a cavern excavation window is arranged in the center of the glass panel.

4. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 1 , wherein the eight groups of loading units respectively carry out independent and synchronous non-uniform loading/unloading via eight oil ways controlled by the hydraulic loading/unloading and steady pressure automatic control system.

5. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 1 , wherein each loading unit includes a hydraulic jack and a force transfer loading module; the bottom of the force transfer loading module is coupled to a loading steel plate on the surface of the test model, the top of the force transfer loading module is connected with the front end of the hydraulic jack via a connecting device, and the rear end of the hydraulic jack is connected to the inner wall of the counterforce device via a second device; and the load of the hydraulic jack is uniformly applied to the test model by using the bench-type force transfer loading module and the counterforce device.

6. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 1 , wherein a loading guide frame device is arranged juxtapose to the exterior of the test model, and the loading guide frame device is formed by welding stainless steel square tubes; and before loading, a loading steel plate of the test model abuts the surface of the test model and is embedded into the loading guide frame device at a predetermined depth.

7. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 1 , wherein the hydraulic loading/unloading and steady pressure automatic control system comprises a visual human-machine interaction system, a PLC hydraulic system and pressure execution system; the visual human-machine interaction system transmits and receives information to and from the PLC hydraulic system; and the PLC hydraulic system transmits and receives information to and from the pressure execution system.

8. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 7 , wherein the visual human-machine interaction system includes a human-machine interface (HMI), a PC monitoring system and a software system; the PLC hydraulic system includes a central control unit, a pressure output unit and a pressure detection unit; the pressure execution system includes a hydraulic oil way system and a hydraulic jack; the software system is installed on the HMI and the PC monitoring system, and the PC monitoring system transmits information to the central control unit and the HMI; the HMI also transmits information to the central control unit, the central control unit controls the pressure output unit, the pressure output unit controls the hydraulic oil way system, and the hydraulic oil way system controls the hydraulic jack; the pressure detection unit detects pressure information of the hydraulic jack and feeds the pressure information back to the central control unit, the central control unit processes the pressure information into digital pressure information, and synchronously transmits the digital pressure information to the HMI or the PC monitoring system, and the pressure information is displayed on the HMI or the PC monitoring system.

9. The auto-controlled pressure three-dimensional non-uniform loading/unloading and steady pressure model test system according to claim 8 , wherein the hydraulic oil way system includes a step motor, an oil pump, a step overflow valve, an O-shaped three-position four-way electromagnetic reversing valve, an electromagnetic ball valve pressure retaining valve and a synchronous valve; the step overflow is configured to adjust the pressure of the oil ways, the O-shaped three-position four-way electromagnetic reversing valve is configured to control the flow direction of the oil ways, the electromagnetic ball valve pressure retaining valve is configured to retain the pressure in the oil ways, and the synchronous valve is configured for synchronous loading; the step motor starts the oil p ump to pump hydraulic oil into the oil ways, the hydraulic oil enters the step overflow valve, and the PLC hydraulic system controls the step motor according to the press

Assignees

• Univ Shandong

Inventors

• Zhang Qiangyong
• Liu Chuancheng
• Li Shucai
• Xiang Wen
• Wang Hanpeng
• Zhang Yue
• Ren Mingyang
• Wu Dong

Classifications

• E21D13/00

  Large underground chambers; Methods or apparatus for making them (lining E21D11/00) · CPC title

• G01N2203/0641

  using optical, X-ray, ultraviolet, infrared or similar detectors · CPC title

• G01N33/24

  Earth materials (G01N33/42 takes precedence) · CPC title

• G01N2203/0019

  Compressive · CPC title

• G01N3/12 Primary

  Pressure testing · CPC title