SHPB压缩试验中红砂岩的力学与能量耗散特性研究

doi:10.11872/j.issn.1005-2518.2020.03.008

Abstract

Abstract:

In underground engineering，rock （body） is damaged or destroyed by impact drilling，blasting，crushing and other dynamic disturbance.In this process，external energy conversion and internal energy consumption are inevitable.Energy dissipation is an important factor that causes rock damage and failure state，so it is of great significance to study the dynamic mechanical properties and failure behavior of rock from the perspective of energy. At present，in the research of rock dynamic characteristics，the commonly used equipment are drop hammer，split Hopkinson pressure bar （SHPB） and light gas gun，among which the SHPB test system is generally used to study the dynamic characteristics of rock under medium and high strain rate（10~10³s^-1）.In order to quantitatively describe the energy dissipation capacity of rock in the process of dynamic compression，the uniaxial dynamic compression tests of cylindrical red sandstone specimens were carried out with SHPB device，and the failure process of the specimen was recorded by a high-speed camera.The test results show that with the increase of incident energy，the specimen shows three different states：intact，ruptured and broken after the dynamic impact loads，and the peak stress of specimen shows obvious strain rate effect.In addition，the failure mode of specimens is mainly tensile failure.In the aspect of energy consumption，the dissipative energy of the specimen shows a two-stage linear growth rule with the critical incident energy as the interval point.When the incident energy is less than the critical incident energy，the specimen remains intact after impact.When the incident energy is greater than the critical incident energy，the specimen will be broken after impact and the fragments will fly out.Based on the obtained linear energy consumption rule，two stages of dynamic compression energy dissipation coefficient （DCEDC） are defined respectively.When the specimen is in intact state，the ideal DCEDC is a fixed value，for the red sandstone specimen in this paper，this value is 0.19. When the specimen is in the broken state the DCEDC increases with the increasing incident energy and gradually approaches 0.68.

Key words: red sandstone, SHPB, dynamic compression test, energy dissipation, dynamic compression energy dissipation coefficient （DCEDC）

CLC Number:

TU45

Jian HU, Fengqiang GONG, Hangyu JIA. Research on Mechanical and Energy Dissipation Characteristics of Red Sandstone in SHPB Compression Test[J].Gold Science and Technology, 2020, 28(3): 411-420.

Figures/Tables 2

图1

References 24

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Research on Mechanical and Energy Dissipation Characteristics of Red Sandstone in SHPB Compression Test

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