Apparatus and method for measuring shock wave pressure in concrete medium

Abstract

The invention discloses a device and a method for measuring the pressure of shock waves in a concrete medium. The device mainly comprises an explosive charge, a fixing structural member, a diaphragm pressure sensor and concrete plates; the measuring device adopts a multi-layer concrete plate structure; the diaphragm pressure sensor is mounted in the geometric center of the surface of each concrete plate and is clamped between two layers of concrete plates; the surfaces of the concrete plates are finely grinded and are provided with slots for leading out wires; the fixing structural member fastens the explosive charge, the diaphragm pressure sensor and the concrete plates. According to the device and the method, the problems of difficult location of the sensor and the explosion center, and the tight bonding of the sensor and the concrete medium and the like in the measurement of pressure of shock waves in the concrete medium are solved, the device and the method are not only suitable for measuring shock waves in the concrete medium, but also suitable for measuring shock waves in soil, rocks and other solid media. The device and the method for measuring the pressure of shock waves in the concrete medium are low in cost, convenient to operate and higher in measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of explosion shock testing, and mainly relates to a measuring device and method for measuring shock wave pressure in a solid medium, in particular to a measuring device and method for measuring shock wave pressure in a concrete medium. Background technique [0002] With the development of military defense, a large number of military targets with strategic value (such as command posts, control and communication stations, etc.) have been transferred to deep underground layers, and many targets are solid concrete structures. For example, the penetrating submunitions used for anti-airport runway weapons use the kinetic energy to make the bullets penetrate into the concrete and explode through large-area throwing bullets, so that the runway will produce large enough craters or the concrete layer will bulge, leaving no trace on the runway. Any complete road surface that may be used for aircraft takeoff and landing...

AI Technical Summary

Problems solved by technology

[0003] However, concrete is a heterogeneous brittle material with a large number of defects. The research on the dynamic constitutive relationship of the material, the coupling effect of the explosion load and the medium, the failure mode of the medium under the action of the explosion shock wave, and the crack and fracture mechanism of the brittle material is difficult due to the Restricted by factors such as testing technology and cost, the research work is very difficult

[0004] The existing technical scheme of shock wave pressure test in concrete is to embed the pressure sensor in the concrete in advance, and then measure the pressure after curing. This measurement method has the following problems: (1) It is difficult to install and position the sensor

The sensitive surface of the pressure sensor cannot be completely perpendicular to the explosion center, and it is easy to be affected by the position and deflection during the pouring process, so that the sensitive surface of the sensor and the explosion center cannot be on the same plane or the shock wave propagation direction and the normal line of the sensor are not on a straight line; ( 2) It is difficult to locate the center of explosion

It is difficult to accurately locate the distance between the sensor and the blast center, and it is not easy to ensure that the positioning pipe is perpendicular to the ground during the pouring process, and the positioning pipe is easy to float when it is light, and easy to sink when it is heavy; (3) The pressure sensor and the concrete medium interface

During the curing process, there may be gaps between the pressure sensor and the concrete medium, resulting in the two not being tightly combined, thereby affecting the measurement results

[0005] For the measurement of the shock wave of the charge explosion inside the concrete medium, domestic scholars have done a certain amount of work using manganese copper and piezoelectric pressure sensors, but due to poor impedance matching, the test distance of the sensor and the direction of the sensitive surface are difficult to accurately control, resulting in The test repeatability is poor and the accuracy is low. The error is mostly more than 50%, and some even reach several times. The test data of each unit is also quite different. At present, there is no more reasonable and perfect method.

[0006] The applicant of the present invention searched domestic and foreign patent documents and published periodical papers, and found no reports or documents closely related to the present invention and the same

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