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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (2): 216-222.doi: 10.11872/j.issn.1005-2518.2019.02.216

• Mining Technology and Mine Management • Previous Articles    

Influence of Moisture Content on Dynamic Tensile Strength of Sandstone

Jianping ZHAO1(),Minghu WANG1(),Yihan ZHAO2   

  1. 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:2018-03-15 Revised:2018-05-03 Online:2019-04-30 Published:2019-04-30
  • Contact: Minghu WANG E-mail:jpzcsu@126.com;283223174@qq.com

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Abstract:

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.

Key words: moisture content, loading rate, sandstone, dynamic tensile strength, SHPB, Brazilian splitting, strain rate dependence, Stefan effect

CLC Number: 

  • TU45

Fig.1

Curve of water content of sandstone samples with time"

Fig.2

Schematic of SHPB test system"

Fig.3

Curves of dynamic stress balance（a）and loading rate（b）in dynamic tests"

Fig.4

Variation laws of sandstone tensile strength with loading rate"

Table 1

Correlation fitting parameters of dynamic tensile strength of different moisture content"

含水率/%abR2
00.3870.3570.883
1.00.2770.4130.956
2.00.1590.4660.955
3.50.0220.7580.893

Fig.5

Variation laws of DIF with loading rate"

Fig.6

Variation laws of sandstone tensile strength with moisture content"

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