Polygonal line and three-dimensional strength characteristics of white sandstone in dry and water-saturated state

被引：0

作者：

Wang Y. ^{[1
]}

Li H. ^{[2
]}

Jiao H. ^{[1
]}

Li Z. ^{[1
]}

Su H. ^{[3
]}

机构：

[1] School of Civil Engineering, Henan Polytechnic University, Jiaozuo

[2] Institute of Geotechnical Engineering and Hydraulic Structure, North China University of Water Resources and Electric Power, Zhengzhou

[3] School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2021年 / 38卷 / 02期

关键词：

Deformation; Failure characteristics; Strength; Water-saturated and dry state; White sandstone;

D O I：

10.13545/j.cnki.jmse.2020.0164

中图分类号：

学科分类号：

摘要：

To study differences of mechanical properties between dryand water-saturated white sandstone and the influence of water-saturation on mechanical behavior of white sandstone, uniaxial and triaxial tests of the dry and water-saturated white sandstone were carried out with RMT system, and strength, deformation differences of dry and water-saturated white sandstones and the influence of water-saturation on them were analyzed. The main conclusions are as follows: Water-saturation weakens the linear elastic deformation characteristics of white sandstone, but enhances non-linear yield characteristics, which is more obvious with the increase of confining pressure. When confining pressure is greater than 20 MPa, compaction does not show in the stress-strain curves of white sandstone. Water-saturation has a significant effect on strength deterioration of white sandstone under uniaxial compression. The softening effect is obvious, i.e., the softening coefficient is small. When confining pressure is greater than 20 MPa, strength deterioration effect and softening effect approach a certain value. Strength deterioration rate of uniaxial compression is 2.62 times that of triaxial compression under high confining pressure, and the softening coefficient under high confining pressure is 1.387 times that under uniaxial compression. When confining pressure is less than 20 MPa, deterioration rate of elastic modulus and deformation modulus decreases linearly with the increase of confining pressure; when confining pressure is greater than 20 MPa, deterioration rate approaches a certain value. Deterioration effect of water-saturation on white sandstone cohesion is obvious while that of internal friction angle is small. According to fitting effect of complete and shielding fitting, the polygonal line strength criterion was established with 30 MPa as the conversion confining pressure. According to strength variation of white sandstone in meridional plane and specific curve of white sandstone determined with William-Warnke deviatoric plane function, three-dimensional strength empirical criterion of white sandstone under dry and water-saturated state were established. The internal damage of white sandstone is serious under uniaxial compression and its distribution area is wide, the micro-cracks gather in many places and develop along many directions, form several main fracture planes and degree of sample damage is serious. The internal damage under triaxial compression develops to be centralized with a narrow distribution and single-directional micro-cracks gathering and development, which forms a single main fracture surface. The results can be used to guide reasonable selection of rock mass parameters in the design of rock mass engineering affected by groundwater. © 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：396 / 403

页数：7

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