Influence of Moisture Content on Dynamic Tensile Strength of Sandstone

Jianping ZHAO; Minghu WANG; Yihan ZHAO

doi:10.11872/j.issn.1005-2518.2019.02.216

Gold Science and Technology >

2019 , Vol. 27 >Issue 2: 216 - 222

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.02.216

Mining Technology and Mine Management

Influence of Moisture Content on Dynamic Tensile Strength of Sandstone

Jianping ZHAO ^,¹ ,
Minghu WANG ^,¹ ,
Yihan ZHAO ²

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1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
2. Power China Zhongnan Engineering Corporation Limited，Changsha 410014，Hunan，China

Received date: 2018-03-15

Revised date: 2018-05-03

Online published: 2019-04-30

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Highlights

The rocks in the project have different water content.It is important for the design and construction of rock engineering to carry out research on the dynamic mechanical properties of different water content rocks.In order to study the effect of different moisture content on the dynamic tensile strength of sandstone，a series of dynamic Brazil split tests were carried out for the samples in different moisture content by using the Hopkinson pressure bar （SHPB） test device，and the dynamic tensile strength change rule of sandstone with different moisture content under different loading rates was studied.Experimental results show that：The dynamic tensile strength of the rock as loading rate increases，rate dependence is related to the moisture content，rate dependence of saturated sample is stronger，while the dynamic strength of the dry rock is not sensitive to the change in rate of loading.When loading rate is lower，the tensile strength of the rock decreases with the increase of moisture content.When loading rate is higher，because the water Stefan effect results in that the resistance to rock crack generated by the water impeded its expansion，which leads to the increase of rock strength，so that the dynamic tensile strength of saturated sample is higher than that of unsaturated sample.

Cite this article

Jianping ZHAO , Minghu WANG , Yihan ZHAO . Influence of Moisture Content on Dynamic Tensile Strength of Sandstone[J]. Gold Science and Technology, 2019 , 27(2) : 216 -222 . DOI: 10.11872/j.issn.1005-2518.2019.02.216

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