黄河砒砂岩单轴抗压性能与含水率关系研究

Study on the Relationship Between Yellow River Pisha Sandstone Uniaxial Compressive Property and Water Content

为研发砒砂岩改性材料、提高砒砂岩抗蚀能力,对黄河砒砂岩单轴抗压性能与含水率的关系进行了研究,研究对象为红白混杂、红色两种砒砂岩。结果表明:红白混杂砒砂岩、红色砒砂岩单轴抗压强度均随着含水率的增大而快速减小;在含水率基本相同的条件下,红色砒砂岩抗压强度的降幅比红白混杂砒砂岩的更为明显;在相同应力时,干燥状态下的红白混杂砒砂岩和红色砒砂岩的应变基本一致,在吸收一定水分后,红白混杂砒砂岩和红色砒砂岩应变的变化规律基本相同,但红色砒砂岩的应变明显大于红白混杂砒砂岩的;红白混杂砒砂岩的透水性较差,遇水时相对不易发生溃散,而红色砒砂岩的透水性较强,稳定透水率大于红白混杂砒砂岩的,遇水时更易发生溃散;当含水率达到9%时,红色砒砂岩单轴抗压强度接近0 MPa,随着含水率的继续增大,单轴抗压强度的变化已不明显。

The relationship of uniaxial compressive property and water content of two kinds （ mixed of red and white and red ） Pisha sandstones were studied for developing the modified materials and improving the corrosion resistance of Pisha sandstone. The results show that the uniaxial compressive strength of the two kinds Pisha sandstones decreases rapidly with the increasing water content; the decrease degree of compressive strength of red sandstone is more obvious than that of the red-white sandstone in the same moisture content; the strain of two kinds Pisha sandstones are basically the same in dry condition with the same stress, as well as the change rule when they absorb a certain moisture, but the strain of red sandstone is significantly higher than that of red-white sandstone; the stable water permeability rate of red sandstone is greater than that of the red-white sandstone, so the red-white sandstone is not easy to disperse in water because of its poor water permeability, while the red sandstone is relatively easy to disperse because of its strong permeability ; the uniaxial compressive strength of red sandstone is close to 0 MPa after the moisture content higher than 9%.