A pressure-sensing particle
A kind of particle and sensing technology, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of large sensor volume, influence of model stress field, inconvenient wire layout, etc.
Active Publication Date: 2017-12-15
NANJING HYDRAULIC RES INST
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Problems solved by technology
This kind of sensor has two disadvantages when used to measure the internal pressure of the model material: first, the pressure signal sensed by the sensor needs to be transmitted to the receiving instrument through wires, which is inconvenient to arrange the wires and will have an impact on the stress field of the model; second, the sensor It has a large volume and has a more obvious impact on the stress of the measured position
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[0011] Such as figure 1 as shown, figure 1 Schematic diagram for the calibration of pressure-sensing particles. Firstly, the stress state of the physical model where the pressure sensing particle is located is predicted ( figure 2 Medium 4). Using the numerical simulation method, it is predicted that the stress at this position is σ 2 = σ 3 =1.0MPa, σ 1 = 2.5MPa. 20 pressure sensing granules with a diameter of 2.0mm are made of materials with a weight ratio of cement: fine sand: water: gypsum = 40: 200: 24: 16, and a uniaxial compressive strength of 1.65 MPa; Cement: fine sand: water: gypsum = 50:160:16:24, and uniaxial compressive strength of 6.3MPa to make 9 calibration test blocks of 50mm×50mm×50mm. When making the calibration test block, 9 pressure sensing particles with a diameter of 2.0mm in the same batch and the same specification were placed in the center of each test block. First take 3 calibration test blocks for calibration, and first apply σ during calibr...
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Abstract
The invention relates to a pressure sensing particle. It is a ball with a diameter of 1.0mm to 30.0mm made of brittle materials such as gypsum and cement. The calibration method is to first predict the stress state of the measured physical model part, embed the particle in the calibration test block, simulate the stress state by using a triaxial compression test, and calibrate the pressure sensing particle by compressing the calibration test block. The calibration value of the same batch of pressure-sensing particles of the same specification is taken as the average value of the calibration values of three calibrated particles. During the physical model test, the pressure sensing particles are buried inside the physical model. When the particles are damaged under pressure, acoustic emission is generated, which is received by the acoustic emission monitor. At this time, the pressure value of the monitored position is the calibration value of the particle.
Description
technical field [0001] The invention relates to a pressure sensing particle and belongs to the field of stress measurement. Background technique [0002] In geotechnical, civil engineering and other disciplines, it is often necessary to measure the pressure inside the model material to carry out physical model tests. At present, the commonly used method is to bury pressure sensors, and the pressure sensors are mainly resistance strain gauges and vibrating wires. This kind of sensor has two disadvantages when used to measure the internal pressure of the model material: first, the pressure signal sensed by the sensor needs to be transmitted to the receiving instrument through wires, which is inconvenient to arrange the wires and will have an impact on the stress field of the model; second, the sensor It has a large volume and has a more obvious impact on the stress of the measured position. Contents of the invention [0003] The invention proposes a pressure sensing particl...
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IPC IPC(8): G01L1/00
Inventor 汤雷牛志国陆俊官福海顾培英
Owner NANJING HYDRAULIC RES INST