Research on compressive mechanical properties and fracture characteristics of water-saturated tuff at different strain rates

被引：0

作者：

Wang H. ^{[1
]}

Zong Q. ^{[1
]}

Wang H. ^{[1
]}

Wang M. ^{[1
]}

Lyu N. ^{[1
]}

Cheng B. ^{[1
]}

Wang F. ^{[1
,2
]}

机构：

[1] School of Civil Engineering and Architecture, Anhui University of Science and Technology, Anhui, Huainan

[2] Beijing Zhongkeli Explosion Technology Engineering Co Ltd, Beijing

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2023年 / 40卷 / 03期

关键词：

crushing energy dissipation density; crushing morphology; longitudinal wave velocity; peak stress; strain rate; water saturation;

D O I：

10.13545/j.cnki.jmse.2022.0444

中图分类号：

学科分类号：

摘要：

In order to explore the effect of strain rate on the mechanical properties and fracture morphology of water-saturated tuff, the uniaxial compression tests at different strain rates on dry and saturated tuff specimens were carried out by an electro-hydraulic servo press and a 50 mm diameter variable cross-section split Hopkinson pressure bar (SHPB) test device. Combined with high-speed camera technology, the effects of water saturation and strain rate were studied on the longitudinal wave velocity, peak stress, elastic modulus, energy dissipation and fracture characteristics of tuff samples. The results show that: The saturated water content of the specimen increases linearly with the increase of porosity, which increases the longitudinal wave propagation velocity of the specimen. Under the action of static load, the peak stress and elastic modulus of the saturated specimen are lower than those of the dry specimen, and the saturated water will cause deterioration of the rock sample. With the increase of the strain rate, the peak stress and elastic modulus of the water-saturated specimen increased more than that of the dry specimen, while the peak stress of the two specimens were similar when the strain rate reached 130 s-1. The water-rock dynamic coupling strengthening effect exists in the saturated specimen under dynamic loading. The crushing energy density of dry specimens under load is higher than that of saturated specimens. With the increase of the strain rate, the increase rate of the energy dissipation density in the water-saturated rock sample is significantly higher than that of the dry rock mass. The existence of water under high strain rate enhances the energy dissipation effect of the tuff. The specimen is in the form of shear failure under static load, while coexists in the form of split tensile failure and axial compression failure under dynamic load. The damage degree of the saturated specimen is significantly higher than that of the dry specimen. © 2023 China University of Mining and Technology. All rights reserved.

引用

页码：611 / 620

页数：9

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