石英砂巖力學(xué)特性及各向異性試驗研究
[Abstract]:In order to study the effects of bedding on the failure mode, elastic modulus and strength of high porosity rock materials under different stress conditions, a static water precompression method is used to increase axial stress for anisotropic quartz sandstone. Triaxial tests with different bedding angles were carried out. The experimental results show that the anisotropic quartz sandstone specimens exhibit different deformation and failure characteristics under different stress conditions, and the failure mode is shear type in the range of low confining pressure with 30 MPa confining pressure as the boundary. In this range, the failure surface changes from inclined to horizontal with the increase of confining pressure, and is affected by different degrees of stratification angle of specimen. In the range of high confining pressure, the failure modes of shear yield and volume yield are divided into two kinds of failure modes: shear yield and volume yield. With the increase of confining pressure, the number of newly closed pore cracks decreases, the effect of anisotropy on elastic modulus decreases, the growth rate of elastic modulus decreases, and the elastic modulus decreases when the bedding distribution angle is 60 擄. The strength curve of the specimens with different bedding distribution is U shape, the strength of the specimens is the lowest in the range of 0 ~ 20 MPa, and the lowest is? = 45 擄in the range of 30 ~ 60 MPa. The strength characteristic coefficient of quartz sandstone with different bedding angles decreases with the increase of confining pressure, and the coefficient tends to be stable when the confining pressure is more than 30 MPa.
【作者單位】: 北京科技大學(xué)金屬礦山高效開采與安全教育部重點實驗室;大連理工大學(xué)工程力學(xué)系;
【基金】:國家自然科學(xué)基金項目(No.51574014)~~
【分類號】:TU45
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