【摘要】：為揭示低溫凍結(jié)作用對板巖破壞類型及抗壓強度的影響,采用DX-40型低溫數(shù)控試驗箱、DNS100微型控制電子萬能試驗機進行7種不同層理傾角β和6種不同試驗溫度t的單軸壓縮試驗,對其應(yīng)力-應(yīng)變曲線以及單軸抗壓強度、峰值應(yīng)變、破壞類型的變化規(guī)律進行分析。在JAEGER層理面理論的基礎(chǔ)上,建立以凍結(jié)溫度和層理傾角為控制變量的單軸抗壓強度公式,給出影響板巖破壞類型的2個極限角度β1和β2的表達式,并通過試驗結(jié)果驗證強度公式的正確性。研究結(jié)果表明:受低溫凍結(jié)作用的影響,板巖的單軸抗壓強度隨溫度降低呈指數(shù)增加;板巖的單軸抗壓強度隨傾角增加先減小后增大;在低溫凍結(jié)條件下,板巖的破壞類型有3種,即當(dāng)0°≤β27.0°時,板巖沿與豎直軸線呈一定角度的方向發(fā)生剪切破壞;當(dāng)27.0°≤β≤82.7°時,板巖沿層理面發(fā)生剪切破壞;當(dāng)82.7°β≤90.0°時,板巖沿垂直方向發(fā)生劈裂破壞。
[Abstract]:In order to reveal the influence of freezing at low temperature on the failure type and compressive strength of slate, DX-40 type low temperature numerical control test box was used. The uniaxial compression tests of 7 different bedding inclination 尾 and 6 different test temperature t were carried out by DNS100 microcontrolled electronic universal testing machine. The stress-strain curves, uniaxial compressive strength and peak strain were measured. The change law of damage type is analyzed. Based on the theory of JAEGER bedding plane, the uniaxial compressive strength formula with freezing temperature and bedding inclination as control variables is established, and the expressions of two limit angles 尾 _ 1 and 尾 _ 2 which affect the failure type of slate are given. The correctness of the strength formula is verified by the experimental results. The results show that the uniaxial compressive strength of slate increases exponentially with the decrease of temperature, and the uniaxial compressive strength of slate decreases first and then increases with the increase of inclination angle. Under the condition of freezing at low temperature, there are three types of slate failure, that is, when the slate is 0 擄鈮，

本文編號：2295092