Multi field coupling test system for dynamic impact of deep engineering rock mass

1. Equipment Overview

(1) Construction: Deep engineering rock mass dynamic impact multi field coupling test system.

(2)

Function: It can simulate the strength and deformation characteristics of deep rocks under high temperature, high stress, and high pore pressure conditions, and obtain the compressive strength, tensile strength, shear strength, elastic modulus, cohesion and internal friction angle, Poisson's ratio, permeability, dynamic rock mechanics parameters, etc. of rocks under complex conditions of high temperature and high pressure multi field coupling. The equipment has the following testing functions:

① Real time high-temperature true triaxial test.

② Experimental study on real-time high-temperature intermediate principal stress effect.

③ High temperature true triaxial hydraulic fracturing test.

④ High temperature true triaxial wellbore stability simulation test.

⑤ Conventional triaxial compression test.

⑥ Stress seepage coupling test.

⑦ Shear seepage coupling test.

⑧ Dynamic impact test.

⑨ Proof document: Provide copies of the equipment operation test data for the above 8 tests in the bidding documents.

(3) Usage environment: The installation location of the equipment has been determined, and the conditions such as water and electricity are already available.

2. Technical requirements

1. High temperature and high pressure true triaxial test module

1.1 Three dimensional stress and real-time high-temperature loading device

Three directional high stiffness rigid loading enables real-time high-temperature true triaxial loading/unloading tests.

The specific technical parameter requirements are as follows:

1.1.1 Sample size: 50mm × 50mm × 100mm;

1.1.2 Large horizontal stress: 150MPa;

1.1.3 Large vertical stress: 800MPa;

1.1.4 Larger piston stroke: 20mm;

1.1.5 Equipped with overpressure safety protection device;

1.1.6 Floating island design with intermediate principal stress direction, capable of automatically achieving centering based on sample deformation;

1.1.7 High real-time temperature: 400 ℃, PID servo control temperature, control accuracy ≤± 5 ℃.

1.2 Technical parameters of horizontal stress servo control system:

1.2.1 Horizontal stress range: 0-150MPa;

1.2.2 Horizontal stress control accuracy: ≤± 0.1% FS;

1.2.3 Software and hardware upper and lower limit protection;

1.2.4 The software can set protection pressure and protection displacement.

1.3 Technical parameters of vertical stress servo control system

1.3.1 Vertical stress range: 0-800MPa;

1.3.2 Vertical stress control accuracy: ≤± 0.1% FS

1.3.3 Software and hardware upper and lower limit protection;

1.3.4 The software can set protection pressure and protection displacement. Provide screenshots of the software interface for forward, lateral, and vertical displacement functions.

1.4 Technical parameters of displacement measurement system

1.4.1LVDT range: ± 5mm;

1.4.2 Resolution: ≤ 0.5 μ m;

1.4.3 Linear error (full-scale output): ≤± 0.25% of FRO;

1.4.4 Repetitive error: ≤ 0.05% of FSO;

1.4.5 Hysteresis error: ≤ 0.05% of FSO;

1.4.6 Input frequency: 2.5 to 3.0 kHz.

1.5 Proof materials

#1.5.1 The software part of the system is a genuine product, and a copy of the copyright registration certificate for the real-time high-temperature true triaxial testing system computer software is provided.

#1.5.2 Provide proof materials for high-temperature true triaxial testing in the bidding documents, such as publicly published papers (SCI or EI), and provide performance or user evaluation proof materials for high-temperature true triaxial testing.

1.5.3 Provide physical equipment drawings and 3D design drawings.

#1.6 Provide a design and testing plan for the high-temperature true triaxial test function.

2. Rock triaxial compression test module

2.1 Static three-axis compression module

Function: It can perform conventional uniaxial/triaxial (full stress-strain curve), creep, stress relaxation, Brazilian splitting and other mechanical experiments.

The technical parameters are as follows:

2.1.1 Rack stiffness: ≥ 8MN/mm.

2.1.2 Axial force: 0-1500kN.

2.1.3 Axial force accuracy: ≤ 0.1% FS.

#2.1.4 confining pressure: 0-60MPa.

2.1.5 confining pressure accuracy: ≤ 0.1% FS.

2.1.6 Pressure servo control device: using a plunger pump structure controlled by a servo motor; Adopting a dual pump circulation mode, endless circulation, not limited by the volume of a single pump; Equipped with a low and high pressure control cabinet for filling and discharging oil in the enclosed pressure chamber, while also isolating high and low pressure modules; The high-pressure control cabinet adopts fully automatic electronic control operation, without the need for manual operation of the mechanical handle of the high-pressure valve.

2.1.7 Sample size: Φ 50mm × 100mm.

2.1.8 Axial cylinder displacement sensor, with a range of 0-100mm.

2.1.9 Axial displacement inside the enclosure: 2 LVDTs, measuring range ± 5mm, resolution ≤ 1 μ m.

2.1.10 Ring displacement: Chain type ring displacement sensor, range: 0-10mm; resolution ≤ 1 μ m.

2.1.11 Software: Control methods: step pressure control, constant pressure control, displacement control; Pressure control accuracy: ≤ 0.1% FS; overpressure relief valve protection; The software can set protection pressure; Hardware limit protection; Can set the path for saving collected data and the sampling interval time; Resolution ≥ 16 bits.

#2.1.12 The software part of the system is a genuine product, and a copy of the computer software copyright registration certificate related to the rock dynamic and static triaxial compression test system is provided.

#2.1.13 Support fitting using different yield criteria (including Mohr Coulomb criterion (M-C criterion), D-P criterion, Hook Brown criterion (H-B criterion), and three shear strain energy (yield) criterion) based on experimental results, and calculate corresponding parameters; (Screenshots of the fitting results of strength parameters using different criteria under real test data should be provided in the bidding documents).

2.2 Liquid seepage module

Function: Cooperate with the three-axis compression module to conduct hydrostatic pressure and liquid permeability testing during the three-axis compression failure process, achieving stress flow coupling test

The technical parameters are as follows:

2.2.1 Osmotic pressure: 0-50MPa

#2.2.2 Long term seepage for ≥ 80 days. Provide proof materials such as publicly published papers (SCI or EI) with a seepage test duration of ≥ 80 days (including the name of the research and development manufacturer and equipment).

2.2.3 Pressure control accuracy: ≤ 0.1% FS.

2.2.4 Flow range: 0.01-60ml/min, adjustable.

2.2.5 Pump cylinder volume ≥ 100ml.

2.2.6 Overpressure relief valve protection (non bursting disc, reusable).

2.2.7 Permeation pressure servo control device: a plunger pump structure controlled by a servo motor; Adopting a dual pump circulation mode, endless circulation, not limited by the volume of a single pump; The high-pressure control cabinet adopts fully automatic electronic control operation, without the need for manual operation of the mechanical handle of the high-pressure valve (provide physical and 3D design drawings of the high-pressure control cabinet).

2.3 Shear seepage test module:

Function: Can conduct seepage tests and water injection crack activation tests during the shearing process;

The technical indicators are as follows:

2.3.1 Normal stress 0-60MPa.

2.3.2 Shear force: 0-1000kN.

2.3.3 Pore pressure: 0-50MPa.

2.3.4 Fixtures suitable for shear function of 50mm rock samples: including control system shear function upgrade package, specimen diameter 50mm shear device fixture, shear special specimen membrane (1 set), provide physical photos of the shear fixture and shear seepage diagram.

2.4 Dynamic servo control system module

Function: Perform stress dynamic servo control.

The technical indicators are as follows:

2.4.1 Frequency: 0-5Hz.

2.4.2 Amplitude: 0-0.1mm.

2.4.3 Large dynamic force: 100kN.

2.5 Proof materials

#2.5.1 Provide proof materials for triaxial compression test, liquid seepage test, shear seepage test, and dynamic impact test in the bidding documents, such as publicly published papers (SCI or EI) (the name of the research and development manufacturer and equipment should be reflected in the paper), and provide proof materials for the performance or user evaluation of the above test functions.

#2.5.2 Provide physical equipment drawings and 3D design drawings.

#2.6 Provide a design and testing plan for the three-axis compression test function; Design and testing plan for stress seepage (shear seepage) coupling test function; Design plan and test plan for power impact test function.

3. Electro hydraulic servo fatigue testing machine

3.1 Load frame

The vertical host is a floor standing structure with servo linear actuators placed below, which can perform vertical fatigue tests.

1.1 The vertical host crossbeam can be raised and lowered along the column, making it easy to adjust the test space.

1.2 Aluminum plate oxidation workbench, clean and beautiful.

1.3 The crossbeam adopts a hydraulic lifting, hydraulic clamping, and elastic release structure to ensure the stability and reliability of the test, while also ensuring that the crossbeam remains locked in place in non test states.

1.4 Unitized, standardized, and modular design of the crossbeam clamping oil cylinder, with sealing components using German imported specialized sealing components.

The outer surface of the 1.5 column is treated with electroplated hard chromium to further improve its aesthetic appearance and enhance its corrosion resistance.

3.2 Silent oil source

Silent oil source: 100L/min, rated working pressure 21MPa, noise ≤ 55dB (tested at 1m), oil pump and motor submerged in hydraulic oil. To ensure long-term use of the oil without deterioration, the oil tank adopts an aluminum fully enclosed structure with anti-corrosion and rust prevention functions. The high-pressure filtration accuracy is ≤ 5 μ, meeting the requirements of stable frequency and amplitude in the test, and the test includes supporting cooling devices. Choose high-quality high-pressure, low-noise internal gear pumps. The motor adopts high-quality brands, and a flexible coupling is used to connect the motor and the oil pump.

Hydraulic Silent Source

Oil separator: a relay station that connects the oil source and actuator, and further ensures the stability of the system and the cleanliness of the hydraulic oil; It is equipped with inlet and outlet oil accumulators, precision filters (with cold blocking alarm device), and oil separation channels with pipeline input and output;

Pipeline system: High pressure hose. The length from the oil source to the oil separator is determined based on the user's experimental site; Oil separator to actuator: The length is determined based on the user's laboratory site;

Oil separator pipeline

Introduction:

(1) The system consists of two sets of motor and oil pump combinations, which can be used to operate the actuators under corresponding speed conditions. In order to save energy during static testing, some pump stations can be activated to reduce usage costs.

(2) Key components of the hydraulic system, such as oil pumps, relief valves, and pipe fittings, are imported, while other hydraulic components are sourced from domestic * enterprises.

(3) The hydraulic system consists of an oil pump motor unit, high and low pressure switching module, cooling system, filtration system, electric control box, alarm display and other parts.

(4) The motor pump unit is equipped with elastic support to further reduce the noise of the pump station.

(5) Configure a low-noise AC motor, and use a German Defu internal gear pump for the oil pump. The pump adopts involute internal gear meshing transmission, with low noise, excellent durability, and long service life.

(6)

The high and low pressure switching hydraulic module is composed of a main relief valve, an accumulator, a secondary main relief valve, a secondary relief valve and a directional valve, and a precision oil filter, ensuring that the system is in a low pressure state when starting up and first switches from a high pressure state to a low pressure state when shutting down, avoiding significant impact on the system due to sudden pressure changes during opening and closing.

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It has a two-stage filtration function, with coarse filtration at the suction port to remove larger particles and impurities, and a precision oil filter on the high and low pressure switching module for secondary fine filtration, ensuring that the oil flowing out of the hydraulic system has extremely high cleanliness.

(8) Each high-pressure oil circuit outlet is equipped with a one-way valve to ensure the safe and independent operation of each oil circuit, without being affected by other oil circuits.

(9) The dual electric contact thermometer, liquid level control gauge, and precision filtration system enable the hydraulic system to have oil temperature, liquid level, filter blockage alarm or shutdown functions.

(10) The pump station has remote monitoring function, and is equipped with a remote control cabinet in the control room, which can detect liquid level, filter element, oil temperature alarm conditions, and remotely control the start and stop of the motor.

Features and functions:

(1) Fully enclosed structure design, special silent technology processing. This pump station is widely used in various dynamic and static testing systems and has formed a series of large-scale production.

(2) The hydraulic components required for the pump station are all selected from domestic and foreign * enterprise products.

(3) The hydraulic pump station consists of an oil pump motor unit, high and low pressure switching module, cooling system, filtration system, electric control box, alarm display and other parts.

(4) The motor pump unit is equipped with a series of double elastic supports to further reduce the noise of the pump station.

(5) Equipped with ABB AC motor and German company's low-noise internal gear pump, compared with ordinary motors and oil pumps, it greatly reduces the noise on the use site while improving performance.

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