本文選題：動(dòng)態(tài)拉伸強(qiáng)度　切入點(diǎn)：巴西圓盤試驗(yàn)　出處：《巖土工程學(xué)報(bào)》2017年06期

【摘要】：通過極限分析上限定理對巴西圓盤動(dòng)態(tài)劈裂試驗(yàn)的彈性解進(jìn)行了優(yōu)化,考慮高速?zèng)_擊作用導(dǎo)致的巖石試件端部剪切裂紋對動(dòng)態(tài)拉伸強(qiáng)度的影響,獲得了計(jì)算動(dòng)態(tài)拉伸強(qiáng)度上限解的新公式。通過對實(shí)測的砂巖動(dòng)態(tài)劈裂試驗(yàn)結(jié)果的分析,對比了原始的彈性解和得到的上限解間的差別,研究表明砂巖的動(dòng)態(tài)拉伸性能隨加載率的變化不明顯,隨著加載率的提高,動(dòng)態(tài)拉伸強(qiáng)度曲線較平緩,說明砂巖在動(dòng)態(tài)作用下承受拉應(yīng)力的能力較低,抗拉強(qiáng)度的變化范圍較小。同時(shí)驗(yàn)證了基于極限分析法的巖石動(dòng)態(tài)抗拉強(qiáng)度公式可以為砂巖的工程應(yīng)用提供更安全可靠的參考值。
[Abstract]:The elastic solution of dynamic splitting test of Brazilian disk is optimized by the upper limit theorem of limit analysis. The effect of shear crack at the end of rock specimen caused by high velocity impact on dynamic tensile strength is considered. A new formula for calculating the upper bound solution of dynamic tensile strength is obtained. The difference between the original elastic solution and the obtained upper bound solution is compared by analyzing the measured results of dynamic splitting test of sandstone. The study shows that the dynamic tensile properties of sandstone have no obvious change with the loading rate, and the dynamic tensile strength curve is relatively flat with the increase of the loading rate, which indicates that the ability of sandstone to bear the tensile stress under the dynamic action is lower. It is verified that the dynamic tensile strength formula based on the limit analysis method can provide a more safe and reliable reference value for the engineering application of sandstone.
【作者單位】： 中國礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院;中國礦業(yè)大學(xué)(北京)深部巖土力學(xué)與地下工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金青年基金項(xiàng)目(51404273)
【分類號(hào)】：TU458

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李煜，

本文編號(hào)：1677537